New Hampshire frost dates
Median last spring frost and first fall frost for 253 places in New Hampshire. Last frost ranges from Apr 13 in Salem to May 31 in Colebrook.
Largest cities
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Manchester | Apr 30 | Oct 11 | 164 d | 6a |
| Nashua | Apr 29 | Oct 8 | 162 d | 6a |
| Concord | May 8 | Oct 3 | 148 d | 5b |
| Dover | May 3 | Oct 10 | 160 d | 6a |
| Rochester | Apr 30 | Oct 9 | 162 d | 6a |
| Salem | Apr 13 | Oct 28 | 198 d | 6a |
| Merrimack | Apr 30 | Oct 12 | 165 d | 6a |
| Keene | May 14 | Oct 1 | 140 d | 5b |
| Derry | Apr 30 | Oct 11 | 164 d | 6a |
| Portsmouth | May 4 | Oct 8 | 157 d | 6a |
| Bedford | Apr 21 | Oct 19 | 181 d | 6a |
| Laconia | Apr 30 | Oct 18 | 171 d | 5b |
| Lebanon | May 9 | Oct 6 | 150 d | 5a |
| Windham | May 3 | Oct 8 | 158 d | 6a |
| Claremont | May 14 | Oct 1 | 140 d | 5b |
| Pelham | May 3 | Oct 8 | 158 d | 6a |
| Somersworth | Apr 30 | Oct 9 | 162 d | 6a |
| Londonderry | Apr 21 | Oct 19 | 181 d | 6a |
| Durham | May 7 | Oct 4 | 150 d | 6a |
| Hampton | May 4 | Oct 8 | 157 d | 6a |
| Berlin | May 14 | Sep 30 | 139 d | 4b |
| Exeter | May 4 | Oct 8 | 157 d | 6a |
| Milford | May 3 | Oct 5 | 155 d | 6a |
| Seabrook | May 4 | Oct 8 | 157 d | 6b |
| Hampstead | Apr 30 | Oct 11 | 164 d | 6a |
| Hanover | May 1 | Oct 13 | 165 d | 5a |
| Weare | May 2 | Oct 8 | 159 d | 6a |
| Franklin | May 7 | Oct 3 | 149 d | 5b |
| Barrington | May 3 | Oct 10 | 160 d | 6a |
| Litchfield | Apr 30 | Oct 12 | 165 d | 6a |
| Plaistow | May 1 | Oct 12 | 164 d | 6a |
| Gilford | Apr 30 | Oct 18 | 171 d | 5b |
| Hollis | Apr 29 | Oct 8 | 162 d | 6a |
| Hudson | May 3 | Oct 8 | 158 d | 6a |
| Swanzey | May 14 | Oct 1 | 140 d | 5b |
| Atkinson | Apr 30 | Oct 11 | 164 d | 6a |
| Kingston | Apr 30 | Oct 11 | 164 d | 6a |
| Rindge | May 5 | Oct 6 | 154 d | 5b |
| Sandown | Apr 30 | Oct 11 | 164 d | 6a |
| Suncook | May 8 | Oct 3 | 148 d | 6a |