Maine Plant Hardiness Zones

Hardiness Zones, also referred to as Growing Zones or Planting zones are defined by the U.S. Department of Agriculture (USDA) Agricultural Research Service (ARS). The zones in this map were created in 2023 using mean extreme climate data covering the period of 1991 to 2020. The previous version of this map released in 2012 was created using climate data from the period of 1976-2005. The data in the 2012 maps covered a cooler period than the 2023 maps.

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Maine Hardiness Zones Map - 2023

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List of Hardiness Zones for Locations in Maine

Location2023 Hardiness Zone2012 Hardiness Zone1990 Hardiness Zone
Auburn5b - -15°F to -10°F 5b - -15°F to -10°F5b - -15°F to -10°F
Augusta5b - -15°F to -10°F 5b - -15°F to -10°F5a - -20°F to -15°F
Bangor5a - -20°F to -15°F 5a - -20°F to -15°F5a - -20°F to -15°F
Bath5b - -15°F to -10°F 5b - -15°F to -10°F5b - -15°F to -10°F
Belfast5b - -15°F to -10°F 5b - -15°F to -10°F5b - -15°F to -10°F
Biddeford6a - -10°F to -5°F 5b - -15°F to -10°F5a - -20°F to -15°F
Brewer5a - -20°F to -15°F 5a - -20°F to -15°F5a - -20°F to -15°F
Brunswick5b - -15°F to -10°F 5b - -15°F to -10°F5b - -15°F to -10°F
Buxton5b - -15°F to -10°F 5b - -15°F to -10°F5a - -20°F to -15°F
Cape Elizabeth6b - -5°F to 0°F 5b - -15°F to -10°F5b - -15°F to -10°F
Caribou4a - -30°F to -25°F 4a - -30°F to -25°F4a - -30°F to -25°F
Ellsworth5b - -15°F to -10°F 5b - -15°F to -10°F5a - -20°F to -15°F
Gardiner5b - -15°F to -10°F 5a - -20°F to -15°F5a - -20°F to -15°F
Gorham5b - -15°F to -10°F 5b - -15°F to -10°F5a - -20°F to -15°F
Hermon5a - -20°F to -15°F 5a - -20°F to -15°F5a - -20°F to -15°F
Kennebunk6a - -10°F to -5°F 5b - -15°F to -10°F5a - -20°F to -15°F
Lebanon5b - -15°F to -10°F 5b - -15°F to -10°F5a - -20°F to -15°F
Lewiston5b - -15°F to -10°F 5b - -15°F to -10°F5b - -15°F to -10°F
New Gloucester5b - -15°F to -10°F 5b - -15°F to -10°F5b - -15°F to -10°F
North Windham5b - -15°F to -10°F 5b - -15°F to -10°F5a - -20°F to -15°F
Oak Hill6a - -10°F to -5°F 5b - -15°F to -10°F5a - -20°F to -15°F
Old Orchard Beach6a - -10°F to -5°F 5b - -15°F to -10°F5b - -15°F to -10°F
Old Town5a - -20°F to -15°F 5a - -20°F to -15°F5a - -20°F to -15°F
Orono5a - -20°F to -15°F 5a - -20°F to -15°F5a - -20°F to -15°F
Paris5a - -20°F to -15°F 5a - -20°F to -15°F5a - -20°F to -15°F
Poland5b - -15°F to -10°F 5a - -20°F to -15°F5a - -20°F to -15°F
Portland6a - -10°F to -5°F 5b - -15°F to -10°F5b - -15°F to -10°F
Presque Isle4a - -30°F to -25°F 4a - -30°F to -25°F4a - -30°F to -25°F
Rockland6a - -10°F to -5°F 6a - -10°F to -5°F5b - -15°F to -10°F
Saco6a - -10°F to -5°F 5b - -15°F to -10°F5a - -20°F to -15°F
Sanford5b - -15°F to -10°F 5b - -15°F to -10°F5a - -20°F to -15°F
Scarborough6a - -10°F to -5°F 5b - -15°F to -10°F5b - -15°F to -10°F
Skowhegan5a - -20°F to -15°F 4b - -25°F to -20°F4b - -25°F to -20°F
South Portland6a - -10°F to -5°F 5b - -15°F to -10°F5b - -15°F to -10°F
Topsham5b - -15°F to -10°F 5b - -15°F to -10°F5b - -15°F to -10°F
Waterboro5b - -15°F to -10°F 5a - -20°F to -15°F5a - -20°F to -15°F
Waterville5b - -15°F to -10°F 5a - -20°F to -15°F4b - -25°F to -20°F
Wells6a - -10°F to -5°F 5b - -15°F to -10°F5b - -15°F to -10°F
Westbrook5b - -15°F to -10°F 5b - -15°F to -10°F5a - -20°F to -15°F
Winslow5b - -15°F to -10°F 5a - -20°F to -15°F4b - -25°F to -20°F
Yarmouth6a - -10°F to -5°F 5b - -15°F to -10°F5b - -15°F to -10°F

Hardiness Zone Maps for Neighboring States

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