Zone 6 Sep. 21 - Sep. 30 | Zone 7 Oct.1 - Oct. 10 | Zone 8 Oct.11 - Oct. 20 |
Zone 9 Oct. 21 - Oct. 31 | Zone 10 Nov. 1 - Nov. 10 | Zone 11 Nov. 11 - Nov. 20 |
Plantmaps has derived zones indicating the Interactive map of average annual First frost dates for the state of Maryland