Iowa 1990 USDA Hardiness Zone Map
View the new 2023 Iowa Hardiness Zone Map
| Zone 4a -30°F to -25°F | Zone 4b -25°F to -20°F | Zone 5a -20°F to -15°F |
Based on the 1990 USDA Hardiness Zone Map, this interactive version covers the state of Iowa which ranges from USDA Zone 4a to USDA Zone 6a.
1990 USDA Hardiness Zone Maps for Neighboring States and Provinces
Related Iowa Maps:
List of 1990 Hardiness Zones for Cities in Iowa
| Location | Hardiness Zone |
|---|---|
| Ackley | Zone 5a: -20°F to -15°F |
| Ackworth | Zone 5a: -20°F to -15°F |
| Adair | Zone 5a: -20°F to -15°F |
| Adel | Zone 5a: -20°F to -15°F |
| Afton | Zone 5a: -20°F to -15°F |
| Agency | Zone 5a: -20°F to -15°F |
| Ainsworth | Zone 5a: -20°F to -15°F |
| Akron | Zone 4b: -25°F to -20°F |
| Albert City | Zone 4b: -25°F to -20°F |
| Albia | Zone 5a: -20°F to -15°F |
| Albion | Zone 4b: -25°F to -20°F |
| Alburnett | Zone 4b: -25°F to -20°F |
| Alden | Zone 5a: -20°F to -15°F |
| Alexander | Zone 4b: -25°F to -20°F |
| Algona | Zone 4b: -25°F to -20°F |
| Alleman | Zone 5a: -20°F to -15°F |
| Allendorf | Zone 4b: -25°F to -20°F |
| Allerton | Zone 5a: -20°F to -15°F |
| Allison | Zone 4b: -25°F to -20°F |
| Alta | Zone 4b: -25°F to -20°F |
| Alta Vista | Zone 4b: -25°F to -20°F |
| Alton | Zone 4b: -25°F to -20°F |
| Altoona | Zone 5a: -20°F to -15°F |
| Alvord | Zone 4b: -25°F to -20°F |
| Amana | Zone 5a: -20°F to -15°F |
| Ames | Zone 5a: -20°F to -15°F |
| Anamosa | Zone 4b: -25°F to -20°F |
| Anderson | Zone 5a: -20°F to -15°F |
| Andover | Zone 5a: -20°F to -15°F |
| Andrew | Zone 5a: -20°F to -15°F |
| Anita | Zone 5a: -20°F to -15°F |
| Ankeny | Zone 5a: -20°F to -15°F |
| Anthon | Zone 4b: -25°F to -20°F |
| Aplington | Zone 4b: -25°F to -20°F |
| Arcadia | Zone 4b: -25°F to -20°F |
| Archer | Zone 4b: -25°F to -20°F |
| Aredale | Zone 4b: -25°F to -20°F |
| Argyle | Zone 5a: -20°F to -15°F |
| Arion | Zone 5a: -20°F to -15°F |
| Arispe | Zone 5a: -20°F to -15°F |
| Arlington | Zone 4a: -30°F to -25°F |
| Armstrong | Zone 4b: -25°F to -20°F |
| Arnolds Park | Zone 4b: -25°F to -20°F |
| Arthur | Zone 4b: -25°F to -20°F |
| Asbury | Zone 4b: -25°F to -20°F |
| Ashton | Zone 4b: -25°F to -20°F |
| Aspinwall | Zone 5a: -20°F to -15°F |
| Atalissa | Zone 5a: -20°F to -15°F |
| Athelstan | Zone 5a: -20°F to -15°F |
| Atkins | Zone 5a: -20°F to -15°F |
| Atlantic | Zone 4b: -25°F to -20°F |
| Auburn | Zone 4b: -25°F to -20°F |
| Audubon | Zone 5a: -20°F to -15°F |
| Aurelia | Zone 4b: -25°F to -20°F |
| Aurora | Zone 4b: -25°F to -20°F |
| Austinville | Zone 4b: -25°F to -20°F |
| Avoca | Zone 4b: -25°F to -20°F |
| Ayrshire | Zone 4b: -25°F to -20°F |
| Badger | Zone 4b: -25°F to -20°F |
| Bagley | Zone 5a: -20°F to -15°F |
| Baldwin | Zone 4b: -25°F to -20°F |
| Balltown | Zone 4b: -25°F to -20°F |
| Bancroft | Zone 4b: -25°F to -20°F |
| Bankston | Zone 4b: -25°F to -20°F |
| Barnes City | Zone 5a: -20°F to -15°F |
| Barnum | Zone 4b: -25°F to -20°F |
| Bartlett | Zone 5a: -20°F to -15°F |
| Bassett | Zone 4b: -25°F to -20°F |
| Batavia | Zone 5a: -20°F to -15°F |
| Battle Creek | Zone 4b: -25°F to -20°F |
| Baxter | Zone 5a: -20°F to -15°F |
| Bayard | Zone 5a: -20°F to -15°F |
| Beacon | Zone 5a: -20°F to -15°F |
| Beaconsfield | Zone 5a: -20°F to -15°F |
| Beaman | Zone 4b: -25°F to -20°F |
| Beaver | Zone 4b: -25°F to -20°F |
| Beaverdale | Zone 5a: -20°F to -15°F |
| Bedford | Zone 4b: -25°F to -20°F |
| Belle Plaine | Zone 5a: -20°F to -15°F |
| Bellevue | Zone 5a: -20°F to -15°F |
| Belmond | Zone 4b: -25°F to -20°F |
| Bennett | Zone 5a: -20°F to -15°F |
| Bentley | Zone 4b: -25°F to -20°F |
| Benton | Zone 5a: -20°F to -15°F |
| Berkley | Zone 4b: -25°F to -20°F |
| Bernard | Zone 4b: -25°F to -20°F |
| Bertram | Zone 5a: -20°F to -15°F |
| Berwick | Zone 5a: -20°F to -15°F |
| Bettendorf | Zone 5a: -20°F to -15°F |
| Bevington | Zone 4b: -25°F to -20°F |
| Birmingham | Zone 5a: -20°F to -15°F |
| Blairsburg | Zone 4b: -25°F to -20°F |
| Blairstown | Zone 5a: -20°F to -15°F |
| Blakesburg | Zone 5a: -20°F to -15°F |
| Blanchard | Zone 5a: -20°F to -15°F |
| Blencoe | Zone 5a: -20°F to -15°F |
| Blockton | Zone 5a: -20°F to -15°F |
| Bloomfield | Zone 5a: -20°F to -15°F |
| Blue Grass | Zone 5a: -20°F to -15°F |
| Bode | Zone 4b: -25°F to -20°F |
| Bolan | Zone 4b: -25°F to -20°F |
| Bonaparte | Zone 5a: -20°F to -15°F |
| Bondurant | Zone 5a: -20°F to -15°F |
| Boone | Zone 4b: -25°F to -20°F |
| Booneville | Zone 5a: -20°F to -15°F |
| Bouton | Zone 4b: -25°F to -20°F |
| Boxholm | Zone 4b: -25°F to -20°F |
| Boyden | Zone 4b: -25°F to -20°F |
| Boyer | Zone 4b: -25°F to -20°F |
| Braddyville | Zone 4b: -25°F to -20°F |
| Bradford | Zone 4b: -25°F to -20°F |
| Bradgate | Zone 4b: -25°F to -20°F |
| Brandon | Zone 4b: -25°F to -20°F |
| Brayton | Zone 5a: -20°F to -15°F |
| Breda | Zone 4b: -25°F to -20°F |
| Bridgewater | Zone 5a: -20°F to -15°F |
| Brighton | Zone 5a: -20°F to -15°F |
| Bristow | Zone 4b: -25°F to -20°F |
| Britt | Zone 4b: -25°F to -20°F |
| Bronson | Zone 4b: -25°F to -20°F |
| Brooklyn | Zone 5a: -20°F to -15°F |
| Brunsville | Zone 4b: -25°F to -20°F |
| Bryant | Zone 5a: -20°F to -15°F |
| Buck Grove | Zone 5a: -20°F to -15°F |
| Buckeye | Zone 5a: -20°F to -15°F |
| Buckingham | Zone 4b: -25°F to -20°F |
| Buffalo | Zone 5a: -20°F to -15°F |
| Buffalo Center | Zone 4b: -25°F to -20°F |
| Burchinal | Zone 4b: -25°F to -20°F |
| Burlington | Zone 5a: -20°F to -15°F |
| Burnside | Zone 4b: -25°F to -20°F |
| Burr Oak | Zone 4b: -25°F to -20°F |
| Burt | Zone 4b: -25°F to -20°F |
| Bussey | Zone 5a: -20°F to -15°F |
| Calamus | Zone 5a: -20°F to -15°F |
| California Junction | Zone 5a: -20°F to -15°F |
| Callender | Zone 4b: -25°F to -20°F |
| Calmar | Zone 4b: -25°F to -20°F |
| Calumet | Zone 4b: -25°F to -20°F |
| Camanche | Zone 5a: -20°F to -15°F |
| Cambridge | Zone 5a: -20°F to -15°F |
| Cantril | Zone 5a: -20°F to -15°F |
| Carbon | Zone 4b: -25°F to -20°F |
| Carlisle | Zone 5a: -20°F to -15°F |
| Carpenter | Zone 4b: -25°F to -20°F |
| Carroll | Zone 4b: -25°F to -20°F |
| Carson | Zone 4b: -25°F to -20°F |
| Carter Lake | Zone 5a: -20°F to -15°F |
| Cascade | Zone 4b: -25°F to -20°F |
| Casey | Zone 5a: -20°F to -15°F |
| Castalia | Zone 4b: -25°F to -20°F |
| Castana | Zone 4b: -25°F to -20°F |
| Cedar | Zone 5a: -20°F to -15°F |
| Cedar Falls | Zone 4b: -25°F to -20°F |
| Cedar Rapids | Zone 5a: -20°F to -15°F |
| Center Junction | Zone 4b: -25°F to -20°F |
| Center Point | Zone 4b: -25°F to -20°F |
| Centerville | Zone 5a: -20°F to -15°F |
| Central City | Zone 4b: -25°F to -20°F |
| Centralia | Zone 4b: -25°F to -20°F |
| Chapin | Zone 4b: -25°F to -20°F |
| Chariton | Zone 5a: -20°F to -15°F |
| Charles City | Zone 4b: -25°F to -20°F |
| Charlotte | Zone 5a: -20°F to -15°F |
| Charter Oak | Zone 5a: -20°F to -15°F |
| Chatsworth | Zone 4b: -25°F to -20°F |
| Chelsea | Zone 4b: -25°F to -20°F |
| Cherokee | Zone 4b: -25°F to -20°F |
| Chester | Zone 4b: -25°F to -20°F |
| Chillicothe | Zone 5a: -20°F to -15°F |
| Churdan | Zone 4b: -25°F to -20°F |
| Cincinnati | Zone 5a: -20°F to -15°F |
| Clare | Zone 4b: -25°F to -20°F |
| Clarence | Zone 5a: -20°F to -15°F |
| Clarinda | Zone 4b: -25°F to -20°F |
| Clarion | Zone 4b: -25°F to -20°F |
| Clarksville | Zone 4b: -25°F to -20°F |
| Clayton | Zone 4b: -25°F to -20°F |
| Clear Lake | Zone 4b: -25°F to -20°F |
| Clearfield | Zone 5a: -20°F to -15°F |
| Cleghorn | Zone 4b: -25°F to -20°F |
| Clemons | Zone 5a: -20°F to -15°F |
| Clermont | Zone 4b: -25°F to -20°F |
| Climbing Hill | Zone 4b: -25°F to -20°F |
| Clinton | Zone 5a: -20°F to -15°F |
| Clinton Stock Yards | Zone 5a: -20°F to -15°F |
| Clio | Zone 5a: -20°F to -15°F |
| Clive | Zone 5a: -20°F to -15°F |
| Clutier | Zone 4b: -25°F to -20°F |
| Coalville | Zone 4b: -25°F to -20°F |
| Coburg | Zone 5a: -20°F to -15°F |
| Coggon | Zone 4b: -25°F to -20°F |
| Coin | Zone 5a: -20°F to -15°F |
| Colesburg | Zone 4b: -25°F to -20°F |
| Colfax | Zone 5a: -20°F to -15°F |
| College Springs | Zone 4b: -25°F to -20°F |
| Collins | Zone 5a: -20°F to -15°F |
| Colo | Zone 5a: -20°F to -15°F |
| Columbia | Zone 5a: -20°F to -15°F |
| Columbus City | Zone 5a: -20°F to -15°F |
| Columbus Jct | Zone 5a: -20°F to -15°F |
| Columbus Junction | Zone 5a: -20°F to -15°F |
| Colwell | Zone 4b: -25°F to -20°F |
| Conesville | Zone 5a: -20°F to -15°F |
| Conrad | Zone 4b: -25°F to -20°F |
| Conroy | Zone 5a: -20°F to -15°F |
| Conway | Zone 5a: -20°F to -15°F |
| Coon Rapids | Zone 5a: -20°F to -15°F |
| Cooper | Zone 5a: -20°F to -15°F |
| Coppock | Zone 5a: -20°F to -15°F |
| Coralville | Zone 5a: -20°F to -15°F |
| Corley | Zone 4b: -25°F to -20°F |
| Corning | Zone 4b: -25°F to -20°F |
| Correctionville | Zone 4b: -25°F to -20°F |
| Corwith | Zone 4b: -25°F to -20°F |
| Corydon | Zone 5a: -20°F to -15°F |
| Cotter | Zone 5a: -20°F to -15°F |
| Coulter | Zone 4b: -25°F to -20°F |
| Council Bluffs | Zone 4b: -25°F to -20°F |
| Craig | Zone 4b: -25°F to -20°F |
| Crawfordsville | Zone 5a: -20°F to -15°F |
| Crescent | Zone 4b: -25°F to -20°F |
| Cresco | Zone 4b: -25°F to -20°F |
| Creston | Zone 5a: -20°F to -15°F |
| Cromwell | Zone 5a: -20°F to -15°F |
| Crystal Lake | Zone 4b: -25°F to -20°F |
| Cumberland | Zone 4b: -25°F to -20°F |
| Cumming | Zone 4b: -25°F to -20°F |
| Curlew | Zone 4b: -25°F to -20°F |
| Cushing | Zone 4b: -25°F to -20°F |
| Cylinder | Zone 4b: -25°F to -20°F |
| Dakota City | Zone 4b: -25°F to -20°F |
| Dallas | Zone 5a: -20°F to -15°F |
| Dallas Center | Zone 5a: -20°F to -15°F |
| Dana | Zone 4b: -25°F to -20°F |
| Danbury | Zone 4b: -25°F to -20°F |
| Danville | Zone 5a: -20°F to -15°F |
| Davenport | Zone 5a: -20°F to -15°F |
| Davis City | Zone 5a: -20°F to -15°F |
| Dawson | Zone 4b: -25°F to -20°F |
| Dayton | Zone 4b: -25°F to -20°F |
| De Soto | Zone 5a: -20°F to -15°F |
| De Witt | Zone 5a: -20°F to -15°F |
| Decatur | Zone 5a: -20°F to -15°F |
| Decorah | Zone 4b: -25°F to -20°F |
| Dedham | Zone 5a: -20°F to -15°F |
| Deep River | Zone 5a: -20°F to -15°F |
| Defiance | Zone 4b: -25°F to -20°F |
| Delaware | Zone 4b: -25°F to -20°F |
| Delhi | Zone 4b: -25°F to -20°F |
| Delmar | Zone 5a: -20°F to -15°F |
| Deloit | Zone 5a: -20°F to -15°F |
| Delphos | Zone 5a: -20°F to -15°F |
| Delta | Zone 5a: -20°F to -15°F |
| Denison | Zone 5a: -20°F to -15°F |
| Denmark | Zone 5a: -20°F to -15°F |
| Denver | Zone 4b: -25°F to -20°F |
| Derby | Zone 5a: -20°F to -15°F |
| Des Moines | Zone 5a: -20°F to -15°F |
| Dewar | Zone 4b: -25°F to -20°F |
| Dexter | Zone 5a: -20°F to -15°F |
| Diagonal | Zone 5a: -20°F to -15°F |
| Dickens | Zone 4b: -25°F to -20°F |
| Dike | Zone 4b: -25°F to -20°F |
| Dixon | Zone 5a: -20°F to -15°F |
| Dolliver | Zone 4b: -25°F to -20°F |
| Donahue | Zone 5a: -20°F to -15°F |
| Donnan | Zone 4b: -25°F to -20°F |
| Donnellson | Zone 5a: -20°F to -15°F |
| Doon | Zone 4b: -25°F to -20°F |
| Dorchester | Zone 4b: -25°F to -20°F |
| Douds | Zone 5a: -20°F to -15°F |
| Dougherty | Zone 4b: -25°F to -20°F |
| Dow City | Zone 5a: -20°F to -15°F |
| Dows | Zone 4b: -25°F to -20°F |
| Drakesville | Zone 5a: -20°F to -15°F |
| Dubuque | Zone 5a: -20°F to -15°F |
| Dumont | Zone 4b: -25°F to -20°F |
| Duncan | Zone 4b: -25°F to -20°F |
| Duncombe | Zone 4b: -25°F to -20°F |
| Dundee | Zone 4b: -25°F to -20°F |
| Dunkerton | Zone 4b: -25°F to -20°F |
| Dunlap | Zone 4b: -25°F to -20°F |
| Durango | Zone 4b: -25°F to -20°F |
| Durant | Zone 5a: -20°F to -15°F |
| Dyersville | Zone 4b: -25°F to -20°F |
| Dysart | Zone 4b: -25°F to -20°F |
| Eagle Grove | Zone 4b: -25°F to -20°F |
| Earlham | Zone 5a: -20°F to -15°F |
| Earling | Zone 4b: -25°F to -20°F |
| Earlville | Zone 4b: -25°F to -20°F |
| Early | Zone 4b: -25°F to -20°F |
| East Amana | Zone 5a: -20°F to -15°F |
| East Peru | Zone 5a: -20°F to -15°F |
| East Pleasant Plain | Zone 5a: -20°F to -15°F |
| Eddyville | Zone 5a: -20°F to -15°F |
| Edgewood | Zone 4b: -25°F to -20°F |
| Elberon | Zone 4b: -25°F to -20°F |
| Eldon | Zone 5a: -20°F to -15°F |
| Eldora | Zone 5a: -20°F to -15°F |
| Eldridge | Zone 5a: -20°F to -15°F |
| Elgin | Zone 4b: -25°F to -20°F |
| Elk Horn | Zone 4b: -25°F to -20°F |
| Elk Run Heights | Zone 4b: -25°F to -20°F |
| Elkader | Zone 4b: -25°F to -20°F |
| Elkhart | Zone 5a: -20°F to -15°F |
| Elkport | Zone 4b: -25°F to -20°F |
| Elliott | Zone 4b: -25°F to -20°F |
| Ellston | Zone 5a: -20°F to -15°F |
| Ellsworth | Zone 5a: -20°F to -15°F |
| Elma | Zone 4b: -25°F to -20°F |
| Elwood | Zone 4b: -25°F to -20°F |
| Ely | Zone 5a: -20°F to -15°F |
| Emerson | Zone 4b: -25°F to -20°F |
| Emmetsburg | Zone 4b: -25°F to -20°F |
| Epworth | Zone 4b: -25°F to -20°F |
| Essex | Zone 5a: -20°F to -15°F |
| Estherville | Zone 4b: -25°F to -20°F |
| Evansdale | Zone 4b: -25°F to -20°F |
| Everly | Zone 4b: -25°F to -20°F |
| Exira | Zone 5a: -20°F to -15°F |
| Exline | Zone 5a: -20°F to -15°F |
| Fairbank | Zone 4b: -25°F to -20°F |
| Fairfax | Zone 5a: -20°F to -15°F |
| Fairfield | Zone 5a: -20°F to -15°F |
| Farley | Zone 4b: -25°F to -20°F |
| Farmersburg | Zone 4b: -25°F to -20°F |
| Farmington | Zone 5a: -20°F to -15°F |
| Farnhamville | Zone 4b: -25°F to -20°F |
| Farragut | Zone 5a: -20°F to -15°F |
| Fayette | Zone 4a: -30°F to -25°F |
| Fenton | Zone 4b: -25°F to -20°F |
| Ferguson | Zone 4b: -25°F to -20°F |
| Fertile | Zone 4b: -25°F to -20°F |
| Floris | Zone 5a: -20°F to -15°F |
| Floyd | Zone 4b: -25°F to -20°F |
| Fonda | Zone 4b: -25°F to -20°F |
| Fontanelle | Zone 5a: -20°F to -15°F |
| Forest City | Zone 4b: -25°F to -20°F |
| Fort Atkinson | Zone 4b: -25°F to -20°F |
| Fort Dodge | Zone 4b: -25°F to -20°F |
| Fort Madison | Zone 5a: -20°F to -15°F |
| Fostoria | Zone 4b: -25°F to -20°F |
| Franklin | Zone 5a: -20°F to -15°F |
| Fraser | Zone 4b: -25°F to -20°F |
| Fredericksburg | Zone 4b: -25°F to -20°F |
| Frederika | Zone 4b: -25°F to -20°F |
| Fredonia | Zone 5a: -20°F to -15°F |
| Fremont | Zone 5a: -20°F to -15°F |
| Fruitland | Zone 5a: -20°F to -15°F |
| Frytown | Zone 5a: -20°F to -15°F |
| Galt | Zone 4b: -25°F to -20°F |
| Galva | Zone 4b: -25°F to -20°F |
| Garber | Zone 4b: -25°F to -20°F |
| Garden City | Zone 5a: -20°F to -15°F |
| Garden Grove | Zone 5a: -20°F to -15°F |
| Garnavillo | Zone 4b: -25°F to -20°F |
| Garner | Zone 4b: -25°F to -20°F |
| Garrison | Zone 4b: -25°F to -20°F |
| Garwin | Zone 4b: -25°F to -20°F |
| Geneva | Zone 4b: -25°F to -20°F |
| George | Zone 4b: -25°F to -20°F |
| Gibson | Zone 5a: -20°F to -15°F |
| Gifford | Zone 5a: -20°F to -15°F |
| Gilbert | Zone 5a: -20°F to -15°F |
| Gilbertville | Zone 4b: -25°F to -20°F |
| Gillett Grove | Zone 4b: -25°F to -20°F |
| Gilman | Zone 4b: -25°F to -20°F |
| Gilmore City | Zone 4b: -25°F to -20°F |
| Gladbrook | Zone 4b: -25°F to -20°F |
| Glenwood | Zone 4b: -25°F to -20°F |
| Glidden | Zone 4b: -25°F to -20°F |
| Goldfield | Zone 4b: -25°F to -20°F |
| Goodell | Zone 4b: -25°F to -20°F |
| Goose Lake | Zone 5a: -20°F to -15°F |
| Gowrie | Zone 4b: -25°F to -20°F |
| Graettinger | Zone 4b: -25°F to -20°F |
| Graf | Zone 4b: -25°F to -20°F |
| Grafton | Zone 4b: -25°F to -20°F |
| Grand Junction | Zone 4b: -25°F to -20°F |
| Grand Mound | Zone 5a: -20°F to -15°F |
| Grand River | Zone 5a: -20°F to -15°F |
| Grandview | Zone 5a: -20°F to -15°F |
| Granger | Zone 5a: -20°F to -15°F |
| Grant | Zone 4b: -25°F to -20°F |
| Granville | Zone 4b: -25°F to -20°F |
| Gravity | Zone 4b: -25°F to -20°F |
| Gray | Zone 5a: -20°F to -15°F |
| Greeley | Zone 4b: -25°F to -20°F |
| Green Island | Zone 5a: -20°F to -15°F |
| Green Mountain | Zone 4b: -25°F to -20°F |
| Greene | Zone 4b: -25°F to -20°F |
| Greenfield | Zone 5a: -20°F to -15°F |
| Greenville | Zone 4b: -25°F to -20°F |
| Grimes | Zone 5a: -20°F to -15°F |
| Grinnell | Zone 4b: -25°F to -20°F |
| Griswold | Zone 4b: -25°F to -20°F |
| Grundy Center | Zone 4b: -25°F to -20°F |
| Gruver | Zone 4b: -25°F to -20°F |
| Guernsey | Zone 5a: -20°F to -15°F |
| Guthrie Center | Zone 5a: -20°F to -15°F |
| Guttenberg | Zone 4b: -25°F to -20°F |
| Halbur | Zone 4b: -25°F to -20°F |
| Hamburg | Zone 5a: -20°F to -15°F |
| Hamilton | Zone 5a: -20°F to -15°F |
| Hamlin | Zone 5a: -20°F to -15°F |
| Hampton | Zone 4b: -25°F to -20°F |
| Hancock | Zone 4b: -25°F to -20°F |
| Hanlontown | Zone 4b: -25°F to -20°F |
| Hansell | Zone 4b: -25°F to -20°F |
| Harcourt | Zone 4b: -25°F to -20°F |
| Hardy | Zone 4b: -25°F to -20°F |
| Harlan | Zone 4b: -25°F to -20°F |
| Harper | Zone 5a: -20°F to -15°F |
| Harpers Ferry | Zone 4b: -25°F to -20°F |
| Harris | Zone 4b: -25°F to -20°F |
| Hartford | Zone 5a: -20°F to -15°F |
| Hartley | Zone 4b: -25°F to -20°F |
| Hartwick | Zone 5a: -20°F to -15°F |
| Harvey | Zone 5a: -20°F to -15°F |
| Hastings | Zone 4b: -25°F to -20°F |
| Havelock | Zone 4b: -25°F to -20°F |
| Haverhill | Zone 4b: -25°F to -20°F |
| Hawarden | Zone 4b: -25°F to -20°F |
| Hawkeye | Zone 4b: -25°F to -20°F |
| Hayesville | Zone 5a: -20°F to -15°F |
| Hayfield | Zone 4b: -25°F to -20°F |
| Hazleton | Zone 4b: -25°F to -20°F |
| Hedrick | Zone 5a: -20°F to -15°F |
| Henderson | Zone 4b: -25°F to -20°F |
| Hepburn | Zone 4b: -25°F to -20°F |
| Hiawatha | Zone 5a: -20°F to -15°F |
| High Amana | Zone 5a: -20°F to -15°F |
| Highlandville | Zone 4b: -25°F to -20°F |
| Hills | Zone 5a: -20°F to -15°F |
| Hillsboro | Zone 5a: -20°F to -15°F |
| Hinton | Zone 4b: -25°F to -20°F |
| Holland | Zone 5a: -20°F to -15°F |
| Holstein | Zone 4b: -25°F to -20°F |
| Holy Cross | Zone 4b: -25°F to -20°F |
| Homestead | Zone 5a: -20°F to -15°F |
| Honey Creek | Zone 4b: -25°F to -20°F |
| Hopkinton | Zone 4b: -25°F to -20°F |
| Hornick | Zone 4b: -25°F to -20°F |
| Hospers | Zone 4b: -25°F to -20°F |
| Houghton | Zone 5a: -20°F to -15°F |
| Hubbard | Zone 5a: -20°F to -15°F |
| Hudson | Zone 4b: -25°F to -20°F |
| Hull | Zone 4b: -25°F to -20°F |
| Humboldt | Zone 4b: -25°F to -20°F |
| Humeston | Zone 5a: -20°F to -15°F |
| Hutchins | Zone 4b: -25°F to -20°F |
| Huxley | Zone 5a: -20°F to -15°F |
| Ida Grove | Zone 4b: -25°F to -20°F |
| Imogene | Zone 5a: -20°F to -15°F |
| Independence | Zone 4b: -25°F to -20°F |
| Indianola | Zone 4b: -25°F to -20°F |
| Inwood | Zone 4b: -25°F to -20°F |
| Ionia | Zone 4b: -25°F to -20°F |
| Iowa City | Zone 5a: -20°F to -15°F |
| Iowa Falls | Zone 5a: -20°F to -15°F |
| Ira | Zone 5a: -20°F to -15°F |
| Ireton | Zone 4b: -25°F to -20°F |
| Irvington | Zone 4b: -25°F to -20°F |
| Irwin | Zone 5a: -20°F to -15°F |
| Jackson Junction | Zone 4b: -25°F to -20°F |
| Jacksonville | Zone 4b: -25°F to -20°F |
| Jamaica | Zone 5a: -20°F to -15°F |
| Janesville | Zone 4b: -25°F to -20°F |
| Jefferson | Zone 5a: -20°F to -15°F |
| Jesup | Zone 4b: -25°F to -20°F |
| Jewell | Zone 4b: -25°F to -20°F |
| Johnston | Zone 5a: -20°F to -15°F |
| Joice | Zone 4b: -25°F to -20°F |
| Jolley | Zone 4b: -25°F to -20°F |
| Kalona | Zone 5a: -20°F to -15°F |
| Kamrar | Zone 4b: -25°F to -20°F |
| Kanawha | Zone 4b: -25°F to -20°F |
| Kellerton | Zone 5a: -20°F to -15°F |
| Kelley | Zone 5a: -20°F to -15°F |
| Kellogg | Zone 4b: -25°F to -20°F |
| Kensett | Zone 4b: -25°F to -20°F |
| Kent | Zone 5a: -20°F to -15°F |
| Keokuk | Zone 5a: -20°F to -15°F |
| Keomah Village | Zone 5a: -20°F to -15°F |
| Keosauqua | Zone 5a: -20°F to -15°F |
| Keota | Zone 5a: -20°F to -15°F |
| Kesley | Zone 4b: -25°F to -20°F |
| Keswick | Zone 5a: -20°F to -15°F |
| Keystone | Zone 5a: -20°F to -15°F |
| Killduff | Zone 5a: -20°F to -15°F |
| Kimballton | Zone 4b: -25°F to -20°F |
| Kingsley | Zone 4b: -25°F to -20°F |
| Kinross | Zone 5a: -20°F to -15°F |
| Kirkman | Zone 4b: -25°F to -20°F |
| Kirkville | Zone 5a: -20°F to -15°F |
| Kiron | Zone 4b: -25°F to -20°F |
| Klemme | Zone 4b: -25°F to -20°F |
| Knierim | Zone 4b: -25°F to -20°F |
| Knoxville | Zone 5a: -20°F to -15°F |
| La Motte | Zone 5a: -20°F to -15°F |
| La Porte City | Zone 4b: -25°F to -20°F |
| Lacona | Zone 5a: -20°F to -15°F |
| Ladora | Zone 5a: -20°F to -15°F |
| Lake City | Zone 4b: -25°F to -20°F |
| Lake Mills | Zone 4b: -25°F to -20°F |
| Lake Park | Zone 4b: -25°F to -20°F |
| Lake View | Zone 4b: -25°F to -20°F |
| Lakeside | Zone 4b: -25°F to -20°F |
| Lakota | Zone 4b: -25°F to -20°F |
| Lambs Grove | Zone 5a: -20°F to -15°F |
| Lamoni | Zone 5a: -20°F to -15°F |
| Lamont | Zone 4b: -25°F to -20°F |
| Lanesboro | Zone 4b: -25°F to -20°F |
| Langworthy | Zone 4b: -25°F to -20°F |
| Lansing | Zone 4b: -25°F to -20°F |
| Larchwood | Zone 4b: -25°F to -20°F |
| Larrabee | Zone 4b: -25°F to -20°F |
| Latimer | Zone 4b: -25°F to -20°F |
| Laurel | Zone 4b: -25°F to -20°F |
| Laurens | Zone 4b: -25°F to -20°F |
| Lawler | Zone 4b: -25°F to -20°F |
| Lawton | Zone 4b: -25°F to -20°F |
| Le Claire | Zone 5a: -20°F to -15°F |
| Le Grand | Zone 4b: -25°F to -20°F |
| Le Mars | Zone 4b: -25°F to -20°F |
| Le Roy | Zone 5a: -20°F to -15°F |
| Leando | Zone 5a: -20°F to -15°F |
| Ledyard | Zone 4b: -25°F to -20°F |
| Lehigh | Zone 4b: -25°F to -20°F |
| Leighton | Zone 5a: -20°F to -15°F |
| Leland | Zone 4b: -25°F to -20°F |
| Lenox | Zone 5a: -20°F to -15°F |
| Leon | Zone 5a: -20°F to -15°F |
| Lester | Zone 4b: -25°F to -20°F |
| Letts | Zone 5a: -20°F to -15°F |
| Lewis | Zone 4b: -25°F to -20°F |
| Liberty Center | Zone 5a: -20°F to -15°F |
| Libertyville | Zone 5a: -20°F to -15°F |
| Lidderdale | Zone 4b: -25°F to -20°F |
| Lime Springs | Zone 4b: -25°F to -20°F |
| Lincoln | Zone 4b: -25°F to -20°F |
| Linden | Zone 5a: -20°F to -15°F |
| Lineville | Zone 5a: -20°F to -15°F |
| Linn Grove | Zone 4b: -25°F to -20°F |
| Lisbon | Zone 5a: -20°F to -15°F |
| Liscomb | Zone 5a: -20°F to -15°F |
| Little Cedar | Zone 4b: -25°F to -20°F |
| Little Rock | Zone 4b: -25°F to -20°F |
| Little Sioux | Zone 5a: -20°F to -15°F |
| Littleport | Zone 4b: -25°F to -20°F |
| Livermore | Zone 4b: -25°F to -20°F |
| Lockridge | Zone 5a: -20°F to -15°F |
| Logan | Zone 4b: -25°F to -20°F |
| Lohrville | Zone 4b: -25°F to -20°F |
| Lone Rock | Zone 4b: -25°F to -20°F |
| Lone Tree | Zone 5a: -20°F to -15°F |
| Long Grove | Zone 5a: -20°F to -15°F |
| Lorimor | Zone 5a: -20°F to -15°F |
| Lost Nation | Zone 4b: -25°F to -20°F |
| Loveland | Zone 4b: -25°F to -20°F |
| Lovilia | Zone 5a: -20°F to -15°F |
| Low Moor | Zone 5a: -20°F to -15°F |
| Lowden | Zone 5a: -20°F to -15°F |
| Lu Verne | Zone 4b: -25°F to -20°F |
| Luana | Zone 4b: -25°F to -20°F |
| Lucas | Zone 5a: -20°F to -15°F |
| Luther | Zone 4b: -25°F to -20°F |
| Luxemburg | Zone 4b: -25°F to -20°F |
| Luzerne | Zone 5a: -20°F to -15°F |
| Lynnville | Zone 5a: -20°F to -15°F |
| Lytton | Zone 4b: -25°F to -20°F |
| Macedonia | Zone 4b: -25°F to -20°F |
| Macksburg | Zone 5a: -20°F to -15°F |
| Madrid | Zone 5a: -20°F to -15°F |
| Magnolia | Zone 4b: -25°F to -20°F |
| Maharishi Vedic City | Zone 5a: -20°F to -15°F |
| Malcom | Zone 5a: -20°F to -15°F |
| Mallard | Zone 4b: -25°F to -20°F |
| Maloy | Zone 5a: -20°F to -15°F |
| Malvern | Zone 4b: -25°F to -20°F |
| Manchester | Zone 4b: -25°F to -20°F |
| Manilla | Zone 5a: -20°F to -15°F |
| Manly | Zone 4b: -25°F to -20°F |
| Manning | Zone 5a: -20°F to -15°F |
| Manson | Zone 4b: -25°F to -20°F |
| Mapleton | Zone 4b: -25°F to -20°F |
| Maquoketa | Zone 4b: -25°F to -20°F |
| Marathon | Zone 4b: -25°F to -20°F |
| Marble Rock | Zone 4b: -25°F to -20°F |
| Marcus | Zone 4b: -25°F to -20°F |
| Marengo | Zone 5a: -20°F to -15°F |
| Marion | Zone 5a: -20°F to -15°F |
| Marne | Zone 4b: -25°F to -20°F |
| Marquette | Zone 4b: -25°F to -20°F |
| Marshalltown | Zone 4b: -25°F to -20°F |
| Martelle | Zone 4b: -25°F to -20°F |
| Martensdale | Zone 4b: -25°F to -20°F |
| Martinsburg | Zone 5a: -20°F to -15°F |
| Marysville | Zone 5a: -20°F to -15°F |
| Mason City | Zone 4b: -25°F to -20°F |
| Masonville | Zone 4b: -25°F to -20°F |
| Massena | Zone 4b: -25°F to -20°F |
| Matlock | Zone 4b: -25°F to -20°F |
| Maurice | Zone 4b: -25°F to -20°F |
| Maxwell | Zone 5a: -20°F to -15°F |
| May City | Zone 4b: -25°F to -20°F |
| Maynard | Zone 4a: -30°F to -25°F |
| Maysville | Zone 5a: -20°F to -15°F |
| McCallsburg | Zone 5a: -20°F to -15°F |
| McCausland | Zone 5a: -20°F to -15°F |
| McClelland | Zone 4b: -25°F to -20°F |
| McGregor | Zone 4b: -25°F to -20°F |
| McIntire | Zone 4b: -25°F to -20°F |
| Mechanicsville | Zone 5a: -20°F to -15°F |
| Mediapolis | Zone 5a: -20°F to -15°F |
| Melbourne | Zone 4b: -25°F to -20°F |
| Melcher | Zone 5a: -20°F to -15°F |
| Melrose | Zone 5a: -20°F to -15°F |
| Melvin | Zone 4b: -25°F to -20°F |
| Menlo | Zone 5a: -20°F to -15°F |
| Meriden | Zone 4b: -25°F to -20°F |
| Merrill | Zone 4b: -25°F to -20°F |
| Meservey | Zone 4b: -25°F to -20°F |
| Meyer | Zone 4b: -25°F to -20°F |
| Middle Amana | Zone 5a: -20°F to -15°F |
| Middletown | Zone 5a: -20°F to -15°F |
| Miles | Zone 5a: -20°F to -15°F |
| Milford | Zone 4b: -25°F to -20°F |
| Miller | Zone 4b: -25°F to -20°F |
| Millersburg | Zone 5a: -20°F to -15°F |
| Millerton | Zone 5a: -20°F to -15°F |
| Millville | Zone 4b: -25°F to -20°F |
| Milo | Zone 5a: -20°F to -15°F |
| Milton | Zone 5a: -20°F to -15°F |
| Minburn | Zone 5a: -20°F to -15°F |
| Minden | Zone 4b: -25°F to -20°F |
| Mineola | Zone 4b: -25°F to -20°F |
| Mingo | Zone 5a: -20°F to -15°F |
| Missouri Valley | Zone 4b: -25°F to -20°F |
| Mitchell | Zone 4b: -25°F to -20°F |
| Mitchellville | Zone 5a: -20°F to -15°F |
| Modale | Zone 5a: -20°F to -15°F |
| Mona | Zone 4b: -25°F to -20°F |
| Mondamin | Zone 5a: -20°F to -15°F |
| Moneta | Zone 4b: -25°F to -20°F |
| Monmouth | Zone 4b: -25°F to -20°F |
| Monona | Zone 4b: -25°F to -20°F |
| Monroe | Zone 5a: -20°F to -15°F |
| Montezuma | Zone 5a: -20°F to -15°F |
| Monticello | Zone 4b: -25°F to -20°F |
| Montour | Zone 4b: -25°F to -20°F |
| Montpelier | Zone 5a: -20°F to -15°F |
| Montrose | Zone 5a: -20°F to -15°F |
| Moorhead | Zone 5a: -20°F to -15°F |
| Moorland | Zone 4b: -25°F to -20°F |
| Moravia | Zone 5a: -20°F to -15°F |
| Morley | Zone 4b: -25°F to -20°F |
| Morning Sun | Zone 5a: -20°F to -15°F |
| Morrison | Zone 4b: -25°F to -20°F |
| Moscow | Zone 5a: -20°F to -15°F |
| Moulton | Zone 5a: -20°F to -15°F |
| Mount Auburn | Zone 4b: -25°F to -20°F |
| Mount Ayr | Zone 5a: -20°F to -15°F |
| Mount Pleasant | Zone 5a: -20°F to -15°F |
| Mount Sterling | Zone 5a: -20°F to -15°F |
| Mount Union | Zone 5a: -20°F to -15°F |
| Mount Vernon | Zone 5a: -20°F to -15°F |
| Moville | Zone 4b: -25°F to -20°F |
| Murray | Zone 5a: -20°F to -15°F |
| Muscatine | Zone 5a: -20°F to -15°F |
| Mystic | Zone 5a: -20°F to -15°F |
| Nashua | Zone 4b: -25°F to -20°F |
| Nemaha | Zone 4b: -25°F to -20°F |
| Neola | Zone 4b: -25°F to -20°F |
| Nevada | Zone 5a: -20°F to -15°F |
| New Albin | Zone 4b: -25°F to -20°F |
| New Hampton | Zone 4b: -25°F to -20°F |
| New Hartford | Zone 4b: -25°F to -20°F |
| New Haven | Zone 4b: -25°F to -20°F |
| New Liberty | Zone 5a: -20°F to -15°F |
| New London | Zone 5a: -20°F to -15°F |
| New Market | Zone 4b: -25°F to -20°F |
| New Providence | Zone 5a: -20°F to -15°F |
| New Sharon | Zone 5a: -20°F to -15°F |
| New Vienna | Zone 4b: -25°F to -20°F |
| New Virginia | Zone 5a: -20°F to -15°F |
| Newell | Zone 4b: -25°F to -20°F |
| Newhall | Zone 5a: -20°F to -15°F |
| Newton | Zone 5a: -20°F to -15°F |
| Nichols | Zone 5a: -20°F to -15°F |
| Nodaway | Zone 4b: -25°F to -20°F |
| Nora Springs | Zone 4b: -25°F to -20°F |
| North Buena Vista | Zone 4b: -25°F to -20°F |
| North English | Zone 5a: -20°F to -15°F |
| North Liberty | Zone 5a: -20°F to -15°F |
| North Washington | Zone 4b: -25°F to -20°F |
| Northboro | Zone 5a: -20°F to -15°F |
| Northwood | Zone 4b: -25°F to -20°F |
| Norwalk | Zone 4b: -25°F to -20°F |
| Norway | Zone 5a: -20°F to -15°F |
| Numa | Zone 5a: -20°F to -15°F |
| Oakdale | Zone 5a: -20°F to -15°F |
| Oakland | Zone 4b: -25°F to -20°F |
| Oakland Acres | Zone 4b: -25°F to -20°F |
| Oakville | Zone 5a: -20°F to -15°F |
| Ocheyedan | Zone 4b: -25°F to -20°F |
| Odebolt | Zone 4b: -25°F to -20°F |
| Oelwein | Zone 4b: -25°F to -20°F |
| Ogden | Zone 4b: -25°F to -20°F |
| Okoboji | Zone 4b: -25°F to -20°F |
| Olds | Zone 5a: -20°F to -15°F |
| Olin | Zone 4b: -25°F to -20°F |
| Ollie | Zone 5a: -20°F to -15°F |
| Onawa | Zone 4b: -25°F to -20°F |
| Oneida | Zone 4b: -25°F to -20°F |
| Onslow | Zone 4b: -25°F to -20°F |
| Oran | Zone 4b: -25°F to -20°F |
| Orange City | Zone 4b: -25°F to -20°F |
| Orchard | Zone 4b: -25°F to -20°F |
| Orient | Zone 5a: -20°F to -15°F |
| Orleans | Zone 4b: -25°F to -20°F |
| Osage | Zone 4b: -25°F to -20°F |
| Osceola | Zone 5a: -20°F to -15°F |
| Oskaloosa | Zone 5a: -20°F to -15°F |
| Ossian | Zone 4b: -25°F to -20°F |
| Osterdock | Zone 4b: -25°F to -20°F |
| Otho | Zone 4b: -25°F to -20°F |
| Otley | Zone 5a: -20°F to -15°F |
| Oto | Zone 4b: -25°F to -20°F |
| Otranto | Zone 4b: -25°F to -20°F |
| Ottosen | Zone 4b: -25°F to -20°F |
| Ottumwa | Zone 5a: -20°F to -15°F |
| Owasa | Zone 5a: -20°F to -15°F |
| Oxford | Zone 5a: -20°F to -15°F |
| Oxford Junction | Zone 4b: -25°F to -20°F |
| Oyens | Zone 4b: -25°F to -20°F |
| Pacific Junction | Zone 4b: -25°F to -20°F |
| Packwood | Zone 5a: -20°F to -15°F |
| Palmer | Zone 4b: -25°F to -20°F |
| Palo | Zone 5a: -20°F to -15°F |
| Panama | Zone 4b: -25°F to -20°F |
| Panora | Zone 5a: -20°F to -15°F |
| Panorama Park | Zone 5a: -20°F to -15°F |
| Park View | Zone 5a: -20°F to -15°F |
| Parkersburg | Zone 4b: -25°F to -20°F |
| Parnell | Zone 5a: -20°F to -15°F |
| Paton | Zone 4b: -25°F to -20°F |
| Patterson | Zone 5a: -20°F to -15°F |
| Paullina | Zone 4b: -25°F to -20°F |
| Pella | Zone 5a: -20°F to -15°F |
| Peosta | Zone 4b: -25°F to -20°F |
| Percival | Zone 5a: -20°F to -15°F |
| Perry | Zone 4b: -25°F to -20°F |
| Persia | Zone 4b: -25°F to -20°F |
| Peru | Zone 5a: -20°F to -15°F |
| Peterson | Zone 4b: -25°F to -20°F |
| Pierson | Zone 4b: -25°F to -20°F |
| Pilot Grove | Zone 5a: -20°F to -15°F |
| Pilot Mound | Zone 4b: -25°F to -20°F |
| Pioneer | Zone 4b: -25°F to -20°F |
| Pisgah | Zone 4b: -25°F to -20°F |
| Plainfield | Zone 4b: -25°F to -20°F |
| Plano | Zone 5a: -20°F to -15°F |
| Pleasant Hill | Zone 5a: -20°F to -15°F |
| Pleasant Plain | Zone 5a: -20°F to -15°F |
| Pleasant Valley | Zone 5a: -20°F to -15°F |
| Pleasanton | Zone 5a: -20°F to -15°F |
| Pleasantville | Zone 5a: -20°F to -15°F |
| Plover | Zone 4b: -25°F to -20°F |
| Plymouth | Zone 4b: -25°F to -20°F |
| Pocahontas | Zone 4b: -25°F to -20°F |
| Polk City | Zone 5a: -20°F to -15°F |
| Pomeroy | Zone 4b: -25°F to -20°F |
| Popejoy | Zone 4b: -25°F to -20°F |
| Portland | Zone 4b: -25°F to -20°F |
| Portsmouth | Zone 4b: -25°F to -20°F |
| Postville | Zone 4b: -25°F to -20°F |
| Prairie City | Zone 5a: -20°F to -15°F |
| Prairieburg | Zone 4b: -25°F to -20°F |
| Prescott | Zone 5a: -20°F to -15°F |
| Preston | Zone 5a: -20°F to -15°F |
| Primghar | Zone 4b: -25°F to -20°F |
| Princeton | Zone 5a: -20°F to -15°F |
| Prole | Zone 4b: -25°F to -20°F |
| Promise City | Zone 5a: -20°F to -15°F |
| Protivin | Zone 4b: -25°F to -20°F |
| Pulaski | Zone 5a: -20°F to -15°F |
| Quasqueton | Zone 4b: -25°F to -20°F |
| Quimby | Zone 4b: -25°F to -20°F |
| Radcliffe | Zone 5a: -20°F to -15°F |
| Rake | Zone 4b: -25°F to -20°F |
| Ralston | Zone 5a: -20°F to -15°F |
| Randalia | Zone 4a: -30°F to -25°F |
| Randall | Zone 5a: -20°F to -15°F |
| Randolph | Zone 4b: -25°F to -20°F |
| Rathbun | Zone 5a: -20°F to -15°F |
| Raymond | Zone 4b: -25°F to -20°F |
| Readlyn | Zone 4b: -25°F to -20°F |
| Reasnor | Zone 5a: -20°F to -15°F |
| Red Oak | Zone 4b: -25°F to -20°F |
| Redding | Zone 5a: -20°F to -15°F |
| Redfield | Zone 5a: -20°F to -15°F |
| Reinbeck | Zone 4b: -25°F to -20°F |
| Rembrandt | Zone 4b: -25°F to -20°F |
| Remsen | Zone 4b: -25°F to -20°F |
| Renwick | Zone 4b: -25°F to -20°F |
| Rhodes | Zone 5a: -20°F to -15°F |
| Riceville | Zone 4b: -25°F to -20°F |
| Richland | Zone 5a: -20°F to -15°F |
| Rickardsville | Zone 4b: -25°F to -20°F |
| Ricketts | Zone 4b: -25°F to -20°F |
| Ridgeway | Zone 4b: -25°F to -20°F |
| Rinard | Zone 4b: -25°F to -20°F |
| Ringsted | Zone 4b: -25°F to -20°F |
| Rippey | Zone 4b: -25°F to -20°F |
| River Sioux | Zone 5a: -20°F to -15°F |
| Riverdale | Zone 5a: -20°F to -15°F |
| Riverside | Zone 5a: -20°F to -15°F |
| Riverton | Zone 5a: -20°F to -15°F |
| Robins | Zone 4b: -25°F to -20°F |
| Rochester | Zone 5a: -20°F to -15°F |
| Rock Falls | Zone 4b: -25°F to -20°F |
| Rock Rapids | Zone 4b: -25°F to -20°F |
| Rock Valley | Zone 4b: -25°F to -20°F |
| Rockford | Zone 4b: -25°F to -20°F |
| Rockwell | Zone 4b: -25°F to -20°F |
| Rockwell City | Zone 4b: -25°F to -20°F |
| Rodman | Zone 4b: -25°F to -20°F |
| Rodney | Zone 4b: -25°F to -20°F |
| Roland | Zone 5a: -20°F to -15°F |
| Rolfe | Zone 4b: -25°F to -20°F |
| Rome | Zone 5a: -20°F to -15°F |
| Rose Hill | Zone 5a: -20°F to -15°F |
| Roseville | Zone 4b: -25°F to -20°F |
| Rossie | Zone 4b: -25°F to -20°F |
| Rowan | Zone 4b: -25°F to -20°F |
| Rowley | Zone 4b: -25°F to -20°F |
| Royal | Zone 4b: -25°F to -20°F |
| Rudd | Zone 4b: -25°F to -20°F |
| Runnells | Zone 5a: -20°F to -15°F |
| Russell | Zone 5a: -20°F to -15°F |
| Ruthven | Zone 4b: -25°F to -20°F |
| Rutland | Zone 4b: -25°F to -20°F |
| Ryan | Zone 4b: -25°F to -20°F |
| Sabula | Zone 5a: -20°F to -15°F |
| Sac City | Zone 4b: -25°F to -20°F |
| Sageville | Zone 5a: -20°F to -15°F |
| Saint Ansgar | Zone 4b: -25°F to -20°F |
| Saint Anthony | Zone 5a: -20°F to -15°F |
| Saint Benedict | Zone 4b: -25°F to -20°F |
| Saint Charles | Zone 5a: -20°F to -15°F |
| Saint Donatus | Zone 5a: -20°F to -15°F |
| Saint Joseph | Zone 4b: -25°F to -20°F |
| Saint Lucas | Zone 4b: -25°F to -20°F |
| Saint Marys | Zone 4b: -25°F to -20°F |
| Saint Olaf | Zone 4b: -25°F to -20°F |
| Saint Paul | Zone 5a: -20°F to -15°F |
| Salem | Zone 5a: -20°F to -15°F |
| Salix | Zone 4b: -25°F to -20°F |
| Sanborn | Zone 4b: -25°F to -20°F |
| Sandyville | Zone 5a: -20°F to -15°F |
| Saylorville | Zone 5a: -20°F to -15°F |
| Scarville | Zone 4b: -25°F to -20°F |
| Schaller | Zone 4b: -25°F to -20°F |
| Schleswig | Zone 4b: -25°F to -20°F |
| Scranton | Zone 5a: -20°F to -15°F |
| Searsboro | Zone 5a: -20°F to -15°F |
| Selma | Zone 5a: -20°F to -15°F |
| Sergeant Bluff | Zone 4b: -25°F to -20°F |
| Sexton | Zone 4b: -25°F to -20°F |
| Seymour | Zone 5a: -20°F to -15°F |
| Shambaugh | Zone 4b: -25°F to -20°F |
| Shannon City | Zone 5a: -20°F to -15°F |
| Sharpsburg | Zone 5a: -20°F to -15°F |
| Sheffield | Zone 4b: -25°F to -20°F |
| Shelby | Zone 4b: -25°F to -20°F |
| Sheldahl | Zone 5a: -20°F to -15°F |
| Sheldon | Zone 4b: -25°F to -20°F |
| Shell Rock | Zone 4b: -25°F to -20°F |
| Shellsburg | Zone 4b: -25°F to -20°F |
| Shenandoah | Zone 5a: -20°F to -15°F |
| Sherrill | Zone 4b: -25°F to -20°F |
| Shueyville | Zone 5a: -20°F to -15°F |
| Sibley | Zone 4b: -25°F to -20°F |
| Sidney | Zone 5a: -20°F to -15°F |
| Sigourney | Zone 5a: -20°F to -15°F |
| Silver City | Zone 4b: -25°F to -20°F |
| Sioux Center | Zone 4b: -25°F to -20°F |
| Sioux City | Zone 4b: -25°F to -20°F |
| Sioux Rapids | Zone 4b: -25°F to -20°F |
| Slater | Zone 5a: -20°F to -15°F |
| Sloan | Zone 4b: -25°F to -20°F |
| Smithland | Zone 4b: -25°F to -20°F |
| Soldier | Zone 5a: -20°F to -15°F |
| Solon | Zone 5a: -20°F to -15°F |
| Somers | Zone 4b: -25°F to -20°F |
| South Amana | Zone 5a: -20°F to -15°F |
| South English | Zone 5a: -20°F to -15°F |
| Spencer | Zone 4b: -25°F to -20°F |
| Sperry | Zone 5a: -20°F to -15°F |
| Spillville | Zone 4b: -25°F to -20°F |
| Spirit Lake | Zone 4b: -25°F to -20°F |
| Spragueville | Zone 5a: -20°F to -15°F |
| Spring Hill | Zone 4b: -25°F to -20°F |
| Springbrook | Zone 5a: -20°F to -15°F |
| Springville | Zone 4b: -25°F to -20°F |
| Stacyville | Zone 4b: -25°F to -20°F |
| Stanhope | Zone 4b: -25°F to -20°F |
| Stanley | Zone 4b: -25°F to -20°F |
| Stanton | Zone 4b: -25°F to -20°F |
| Stanwood | Zone 5a: -20°F to -15°F |
| State Center | Zone 5a: -20°F to -15°F |
| Steamboat Rock | Zone 5a: -20°F to -15°F |
| Stockport | Zone 5a: -20°F to -15°F |
| Stockton | Zone 5a: -20°F to -15°F |
| Stone City | Zone 4b: -25°F to -20°F |
| Storm Lake | Zone 4b: -25°F to -20°F |
| Story City | Zone 5a: -20°F to -15°F |
| Stout | Zone 4b: -25°F to -20°F |
| Stratford | Zone 4b: -25°F to -20°F |
| Strawberry Point | Zone 4b: -25°F to -20°F |
| Struble | Zone 4b: -25°F to -20°F |
| Stuart | Zone 5a: -20°F to -15°F |
| Sully | Zone 5a: -20°F to -15°F |
| Sumner | Zone 4b: -25°F to -20°F |
| Sundown Mountain Ski Area | Zone 4b: -25°F to -20°F |
| Superior | Zone 4b: -25°F to -20°F |
| Sutherland | Zone 4b: -25°F to -20°F |
| Swaledale | Zone 4b: -25°F to -20°F |
| Swan | Zone 5a: -20°F to -15°F |
| Swea City | Zone 4b: -25°F to -20°F |
| Swedesburg | Zone 5a: -20°F to -15°F |
| Swisher | Zone 5a: -20°F to -15°F |
| Tabor | Zone 4b: -25°F to -20°F |
| Tama | Zone 4b: -25°F to -20°F |
| Teeds Grove | Zone 5a: -20°F to -15°F |
| Templeton | Zone 5a: -20°F to -15°F |
| Tennant | Zone 4b: -25°F to -20°F |
| Terril | Zone 4b: -25°F to -20°F |
| Thayer | Zone 5a: -20°F to -15°F |
| Thompson | Zone 4b: -25°F to -20°F |
| Thor | Zone 4b: -25°F to -20°F |
| Thornburg | Zone 5a: -20°F to -15°F |
| Thornton | Zone 4b: -25°F to -20°F |
| Thurman | Zone 5a: -20°F to -15°F |
| Tiffin | Zone 5a: -20°F to -15°F |
| Tingley | Zone 5a: -20°F to -15°F |
| Tipton | Zone 5a: -20°F to -15°F |
| Titonka | Zone 4b: -25°F to -20°F |
| Toddville | Zone 4b: -25°F to -20°F |
| Toeterville | Zone 4b: -25°F to -20°F |
| Toledo | Zone 4b: -25°F to -20°F |
| Toronto | Zone 4b: -25°F to -20°F |
| Tracy | Zone 5a: -20°F to -15°F |
| Traer | Zone 4b: -25°F to -20°F |
| Treynor | Zone 4b: -25°F to -20°F |
| Tripoli | Zone 4b: -25°F to -20°F |
| Troy Mills | Zone 4b: -25°F to -20°F |
| Truesdale | Zone 4b: -25°F to -20°F |
| Truro | Zone 5a: -20°F to -15°F |
| Turin | Zone 4b: -25°F to -20°F |
| Udell | Zone 5a: -20°F to -15°F |
| Underwood | Zone 4b: -25°F to -20°F |
| Union | Zone 5a: -20°F to -15°F |
| Unionville | Zone 5a: -20°F to -15°F |
| University Heights | Zone 5a: -20°F to -15°F |
| University Park | Zone 5a: -20°F to -15°F |
| Urbana | Zone 4b: -25°F to -20°F |
| Urbandale | Zone 5a: -20°F to -15°F |
| Ute | Zone 5a: -20°F to -15°F |
| Vail | Zone 5a: -20°F to -15°F |
| Valeria | Zone 5a: -20°F to -15°F |
| Van Horne | Zone 5a: -20°F to -15°F |
| Van Meter | Zone 5a: -20°F to -15°F |
| Van Wert | Zone 5a: -20°F to -15°F |
| Varina | Zone 4b: -25°F to -20°F |
| Ventura | Zone 4b: -25°F to -20°F |
| Victor | Zone 5a: -20°F to -15°F |
| Villisca | Zone 4b: -25°F to -20°F |
| Vincent | Zone 4b: -25°F to -20°F |
| Vining | Zone 4b: -25°F to -20°F |
| Vinton | Zone 4b: -25°F to -20°F |
| Viola | Zone 4b: -25°F to -20°F |
| Volga | Zone 4b: -25°F to -20°F |
| Wadena | Zone 4a: -30°F to -25°F |
| Wahpeton | Zone 4b: -25°F to -20°F |
| Walcott | Zone 5a: -20°F to -15°F |
| Walford | Zone 5a: -20°F to -15°F |
| Walker | Zone 4b: -25°F to -20°F |
| Wall Lake | Zone 4b: -25°F to -20°F |
| Wallingford | Zone 4b: -25°F to -20°F |
| Walnut | Zone 4b: -25°F to -20°F |
| Wapello | Zone 5a: -20°F to -15°F |
| Washburn | Zone 4b: -25°F to -20°F |
| Washington | Zone 5a: -20°F to -15°F |
| Washta | Zone 4b: -25°F to -20°F |
| Waterloo | Zone 4b: -25°F to -20°F |
| Waterville | Zone 4b: -25°F to -20°F |
| Watkins | Zone 5a: -20°F to -15°F |
| Waucoma | Zone 4b: -25°F to -20°F |
| Waukee | Zone 5a: -20°F to -15°F |
| Waukon | Zone 4b: -25°F to -20°F |
| Waverly | Zone 4b: -25°F to -20°F |
| Wayland | Zone 5a: -20°F to -15°F |
| Webb | Zone 4b: -25°F to -20°F |
| Webster | Zone 5a: -20°F to -15°F |
| Webster City | Zone 4b: -25°F to -20°F |
| Weldon | Zone 5a: -20°F to -15°F |
| Wellman | Zone 5a: -20°F to -15°F |
| Wellsburg | Zone 5a: -20°F to -15°F |
| Weltman | Zone 5a: -20°F to -15°F |
| Welton | Zone 5a: -20°F to -15°F |
| Wesley | Zone 4b: -25°F to -20°F |
| West Amana | Zone 5a: -20°F to -15°F |
| West Bend | Zone 4b: -25°F to -20°F |
| West Branch | Zone 5a: -20°F to -15°F |
| West Burlington | Zone 5a: -20°F to -15°F |
| West Chester | Zone 5a: -20°F to -15°F |
| West Des Moines | Zone 5a: -20°F to -15°F |
| West Grove | Zone 5a: -20°F to -15°F |
| West Liberty | Zone 5a: -20°F to -15°F |
| West Okoboji | Zone 4b: -25°F to -20°F |
| West Point | Zone 5a: -20°F to -15°F |
| West Union | Zone 4b: -25°F to -20°F |
| Westfield | Zone 4b: -25°F to -20°F |
| Westgate | Zone 4b: -25°F to -20°F |
| Weston | Zone 4b: -25°F to -20°F |
| Westphalia | Zone 4b: -25°F to -20°F |
| Westside | Zone 4b: -25°F to -20°F |
| Westwood | Zone 5a: -20°F to -15°F |
| Wever | Zone 5a: -20°F to -15°F |
| What Cheer | Zone 5a: -20°F to -15°F |
| Wheatland | Zone 5a: -20°F to -15°F |
| Whiting | Zone 4b: -25°F to -20°F |
| Whittemore | Zone 4b: -25°F to -20°F |
| Whitten | Zone 5a: -20°F to -15°F |
| Willey | Zone 4b: -25°F to -20°F |
| Williams | Zone 4b: -25°F to -20°F |
| Williamsburg | Zone 5a: -20°F to -15°F |
| Williamson | Zone 5a: -20°F to -15°F |
| Wilton | Zone 5a: -20°F to -15°F |
| Windsor Heights | Zone 5a: -20°F to -15°F |
| Winfield | Zone 5a: -20°F to -15°F |
| Winterset | Zone 5a: -20°F to -15°F |
| Winthrop | Zone 4b: -25°F to -20°F |
| Wiota | Zone 4b: -25°F to -20°F |
| Woden | Zone 4b: -25°F to -20°F |
| Woodbine | Zone 4b: -25°F to -20°F |
| Woodburn | Zone 5a: -20°F to -15°F |
| Woodward | Zone 4b: -25°F to -20°F |
| Woolstock | Zone 4b: -25°F to -20°F |
| Worthington | Zone 4b: -25°F to -20°F |
| Wyoming | Zone 4b: -25°F to -20°F |
| Yale | Zone 5a: -20°F to -15°F |
| Yarmouth | Zone 5a: -20°F to -15°F |
| Yetter | Zone 4b: -25°F to -20°F |
| Yorktown | Zone 5a: -20°F to -15°F |
| Zearing | Zone 5a: -20°F to -15°F |
| Zwingle | Zone 5a: -20°F to -15°F |