New Hampshire frost dates: H
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Hampstead | Apr 30 | Oct 11 | 164 d | 6a |
| Hampton | May 4 | Oct 8 | 157 d | 6a |
| Hampton Falls | May 4 | Oct 8 | 157 d | 6b |
| Hancock | May 5 | Oct 6 | 154 d | 6a |
| Hanover | May 1 | Oct 13 | 165 d | 5a |
| Harrisville | May 5 | Oct 6 | 154 d | 6a |
| Haverhill | May 15 | Sep 28 | 136 d | 5a |
| Hebron | May 20 | Sep 27 | 130 d | 5b |
| Henniker | May 6 | Oct 1 | 148 d | 5b |
| Hill | May 7 | Oct 3 | 149 d | 5b |
| Hillsborough | May 9 | Oct 5 | 149 d | 6a |
| Hinsdale | May 14 | Oct 1 | 140 d | 5b |
| Holderness | May 20 | Sep 27 | 130 d | 5b |
| Hollis | Apr 29 | Oct 8 | 162 d | 6a |
| Hooksett | Apr 30 | Oct 11 | 164 d | 6a |
| Hudson | May 3 | Oct 8 | 158 d | 6a |