New Hampshire frost dates: S
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Salem | Apr 13 | Oct 28 | 198 d | 6a |
| Salisbury | May 14 | Sep 29 | 138 d | 5b |
| Sanbornton | May 7 | Oct 3 | 149 d | 5b |
| Sanbornville | May 16 | Sep 30 | 137 d | 5b |
| Sandown | Apr 30 | Oct 11 | 164 d | 6a |
| Seabrook | May 4 | Oct 8 | 157 d | 6b |
| Silver Lake | May 16 | Sep 26 | 133 d | 5a |
| Somersworth | Apr 30 | Oct 9 | 162 d | 6a |
| South Acworth | May 14 | Oct 1 | 140 d | 5b |
| South Newbury | May 15 | Sep 27 | 135 d | 5b |
| South Sutton | May 15 | Sep 27 | 135 d | 5b |
| South Tamworth | May 6 | Oct 6 | 153 d | 5a |
| Spofford | May 14 | Oct 1 | 140 d | 6a |
| Springfield | May 21 | Sep 26 | 128 d | 5b |
| Stoddard | May 15 | Sep 27 | 135 d | 6a |
| Strafford | Apr 30 | Oct 9 | 162 d | 6a |
| Stratham | May 4 | Oct 8 | 157 d | 6a |
| Sugar Hill | May 24 | Sep 18 | 117 d | 5a |
| Sullivan | May 14 | Oct 1 | 140 d | 6a |
| Sunapee | May 2 | Oct 9 | 160 d | 5b |
| Suncook | May 8 | Oct 3 | 148 d | 6a |
| Swanzey | May 14 | Oct 1 | 140 d | 5b |