Zone 9 Oct. 21 - Oct. 31 | Zone 10 Nov. 1 - Nov. 10 | Zone 11 Nov. 11 - Nov. 20 | Zone 12 Nov. 21 - Nov. 30 |
Zone 13 Dec. 1 - Dec. 10 | Zone 14 Dec. 11 - Dec. 20 | Zone 15 Dec. 21 - Dec. 31 |
Plantmaps has derived zones indicating the average annual First frost dates for Belgium