Maine frost dates: S
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Sabattus | Apr 25 | Oct 19 | 177 d | 5b |
| Saco | May 9 | Oct 3 | 147 d | 5b |
| Saint Agatha | May 6 | Oct 2 | 149 d | 4a |
| Saint Albans | May 11 | Oct 1 | 143 d | 5a |
| Saint David | May 6 | Oct 2 | 149 d | 4b |
| Saint Francis | Jun 2 | Sep 15 | 105 d | 4b |
| Salsbury Cove | Apr 27 | Oct 22 | 178 d | 6a |
| Sandy Point | May 7 | Oct 5 | 151 d | 5b |
| Sanford | May 16 | Sep 30 | 137 d | 5b |
| Sangerville | May 6 | Oct 7 | 154 d | 5a |
| Sargentville | May 7 | Oct 5 | 151 d | 6a |
| Scarborough | Apr 26 | Oct 15 | 172 d | 6a |
| Seal Cove | Apr 27 | Oct 22 | 178 d | 6a |
| Seal Harbor | Apr 27 | Oct 22 | 178 d | 6a |
| Searsmont | May 7 | Oct 5 | 151 d | 5b |
| Searsport | May 7 | Oct 5 | 151 d | 5b |
| Sebago | May 12 | Oct 1 | 142 d | 5a |
| Sebasco Estates | May 2 | Oct 10 | 161 d | 6a |
| Sebec | May 12 | Oct 1 | 142 d | 5a |
| Sedgwick | May 8 | Oct 9 | 154 d | 5b |
| Shapleigh | May 16 | Sep 30 | 137 d | 5b |
| Shawmut | May 2 | Oct 10 | 161 d | 5b |
| Sheridan | May 14 | Sep 26 | 135 d | 4a |
| Sherman | May 13 | Sep 30 | 140 d | 5a |
| Shirley Mills | May 7 | Oct 9 | 155 d | 5a |
| Sinclair | May 6 | Oct 2 | 149 d | 4a |
| Skowhegan | May 8 | Oct 5 | 150 d | 5a |
| Smithfield | May 7 | Oct 2 | 148 d | 5a |
| Smyrna Mills | May 13 | Sep 30 | 140 d | 4b |
| Solon | May 8 | Oct 5 | 150 d | 5a |
| Sorrento | Apr 27 | Oct 22 | 178 d | 6a |
| South Berwick | May 1 | Oct 14 | 166 d | 6a |
| South Bristol | Apr 28 | Oct 21 | 176 d | 6a |
| South Casco | Apr 30 | Oct 20 | 173 d | 5b |
| South China | May 2 | Oct 10 | 161 d | 5b |
| South Freeport | Apr 28 | Oct 19 | 174 d | 6a |
| South Gardiner | May 1 | Oct 11 | 163 d | 5b |
| South Paris | May 1 | Oct 10 | 162 d | 5b |
| South Portland | Apr 26 | Oct 15 | 172 d | 6a |
| South Thomaston | Apr 27 | Oct 25 | 181 d | 6a |
| South Windham | Apr 26 | Oct 15 | 172 d | 5b |
| Southport | Apr 28 | Oct 21 | 176 d | 6a |
| Southwest Harbor | Apr 27 | Oct 22 | 178 d | 6a |
| Springfield | May 6 | Oct 8 | 155 d | 5a |
| Springvale | May 16 | Sep 30 | 137 d | 5b |
| Spruce Head | Apr 27 | Oct 25 | 181 d | 6a |
| Squirrel Island | Apr 27 | Oct 18 | 174 d | 6a |
| Stacyville | May 13 | Sep 30 | 140 d | 5a |
| Standish | Apr 30 | Oct 20 | 173 d | 5b |
| Steep Falls | May 7 | Oct 4 | 150 d | 5a |
| Stetson | May 8 | Oct 3 | 148 d | 5a |
| Steuben | Apr 27 | Oct 22 | 178 d | 6a |
| Stillwater | May 1 | Oct 6 | 158 d | 5a |
| Stockholm | May 23 | Sep 26 | 126 d | 4a |
| Stockton Springs | May 7 | Oct 5 | 151 d | 5b |
| Stoneham | May 6 | Oct 2 | 149 d | 5a |
| Stonington | May 7 | Oct 5 | 151 d | 6a |
| Stratton | May 24 | Sep 21 | 120 d | 4b |
| Strong | May 16 | Sep 26 | 133 d | 5a |
| Sullivan | Apr 27 | Oct 22 | 178 d | 5b |
| Sumner | May 6 | Oct 3 | 150 d | 5a |
| Sunset | May 7 | Oct 5 | 151 d | 6a |
| Surry | May 8 | Oct 9 | 154 d | 5b |
| Swans Island | Apr 27 | Oct 22 | 178 d | 6b |