New Hampshire frost dates: A
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Acworth | May 8 | Oct 3 | 148 d | 6a |
| Alstead | May 8 | Oct 3 | 148 d | 6a |
| Alton | Apr 30 | Oct 18 | 171 d | 5b |
| Alton Bay | Apr 30 | Oct 18 | 171 d | 5b |
| Amherst | Apr 28 | Oct 8 | 163 d | 6a |
| Andover | May 14 | Sep 29 | 138 d | 5b |
| Antrim | May 9 | Oct 5 | 149 d | 6a |
| Ashland | May 20 | Sep 27 | 130 d | 5b |
| Ashuelot | May 14 | Oct 1 | 140 d | 5b |
| Atkinson | Apr 30 | Oct 11 | 164 d | 6a |
| Auburn | Apr 30 | Oct 11 | 164 d | 6a |