Maine frost dates: H
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Hallowell | Apr 27 | Oct 16 | 172 d | 5b |
| Hampden | May 4 | Oct 4 | 153 d | 5a |
| Hancock | Apr 27 | Oct 22 | 178 d | 5b |
| Hanover | May 12 | Sep 29 | 140 d | 5a |
| Harborside | May 7 | Oct 5 | 151 d | 6a |
| Harmony | May 11 | Oct 1 | 143 d | 5a |
| Harpswell | May 2 | Oct 10 | 161 d | 6a |
| Harrington | May 3 | Oct 9 | 159 d | 6a |
| Harrison | May 5 | Oct 5 | 153 d | 5a |
| Hartland | May 11 | Oct 1 | 143 d | 5a |
| Hebron | May 1 | Oct 10 | 162 d | 5b |
| Hinckley | May 2 | Oct 10 | 161 d | 5a |
| Hiram | May 12 | Oct 1 | 142 d | 5a |
| Holden | May 4 | Oct 4 | 153 d | 5a |
| Hollis Center | May 14 | Sep 30 | 139 d | 5b |
| Hope | Apr 27 | Oct 19 | 175 d | 5b |
| Houlton | May 27 | Sep 18 | 114 d | 4b |
| Howland | May 4 | Oct 6 | 155 d | 5a |
| Hudson | May 13 | Sep 28 | 138 d | 5a |
| Hulls Cove | Apr 27 | Oct 22 | 178 d | 6a |