Massachusetts frost dates: S
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Sagamore | Apr 26 | Oct 26 | 183 d | 7a |
| Sagamore Beach | Apr 26 | Oct 26 | 183 d | 7a |
| Salem | Apr 24 | Oct 17 | 176 d | 6b |
| Salisbury | May 3 | Oct 8 | 158 d | 6b |
| Sandisfield | May 3 | Oct 11 | 161 d | 6a |
| Sandwich | Apr 26 | Oct 26 | 183 d | 7a |
| Saugus | Apr 4 | Nov 9 | 219 d | 6b |
| Savoy | May 17 | Oct 1 | 137 d | 5b |
| Scituate | Apr 25 | Oct 22 | 180 d | 7a |
| Seekonk | Apr 11 | Oct 30 | 202 d | 7a |
| Sharon | Apr 27 | Oct 14 | 170 d | 6b |
| Sheffield | May 4 | Oct 11 | 160 d | 6a |
| Shelburne Falls | May 17 | Oct 1 | 137 d | 5b |
| Sheldonville | Apr 22 | Oct 19 | 180 d | 6b |
| Sherborn | Apr 26 | Oct 12 | 169 d | 6b |
| Shirley | Apr 29 | Oct 11 | 165 d | 6a |
| Shrewsbury | Apr 23 | Oct 21 | 181 d | 6a |
| Shutesbury | May 2 | Oct 9 | 160 d | 5b |
| Siasconset | Apr 13 | Nov 8 | 209 d | 7b |
| Somerset | Apr 11 | Nov 2 | 205 d | 7a |
| Somerville | Apr 4 | Nov 9 | 219 d | 7a |
| South Barre | May 12 | Oct 1 | 142 d | 6a |
| South Carver | Apr 30 | Oct 16 | 169 d | 6b |
| South Chatham | Apr 13 | Nov 4 | 205 d | 7b |
| South Dartmouth | Apr 11 | Nov 5 | 208 d | 7a |
| South Deerfield | May 2 | Oct 9 | 160 d | 6a |
| South Dennis | Apr 13 | Nov 3 | 204 d | 7a |
| South Easton | Apr 27 | Oct 15 | 171 d | 6b |
| South Egremont | May 4 | Oct 11 | 160 d | 6a |
| South Grafton | Apr 23 | Oct 21 | 181 d | 6b |
| South Hadley | May 3 | Oct 8 | 158 d | 6a |
| South Hamilton | May 4 | Oct 12 | 161 d | 6b |
| South Harwich | Apr 13 | Nov 4 | 205 d | 7b |
| South Lancaster | Apr 29 | Oct 11 | 165 d | 6b |
| South Lee | May 7 | Oct 3 | 149 d | 5b |
| South Orleans | Apr 13 | Nov 4 | 205 d | 7b |
| South Walpole | Apr 27 | Oct 14 | 170 d | 6b |
| South Wellfleet | Apr 13 | Nov 4 | 205 d | 7b |
| South Weymouth | Apr 25 | Oct 22 | 180 d | 6b |
| South Yarmouth | Apr 13 | Nov 3 | 204 d | 7a |
| Southampton | May 3 | Oct 8 | 158 d | 6a |
| Southborough | Apr 26 | Oct 12 | 169 d | 6b |
| Southbridge | Apr 25 | Oct 13 | 171 d | 6b |
| Southfield | May 3 | Oct 11 | 161 d | 6a |
| Southwick | Apr 28 | Oct 17 | 172 d | 6b |
| Spencer | Apr 23 | Oct 21 | 181 d | 6a |
| Springfield | May 3 | Oct 8 | 158 d | 6b |
| Sterling | Apr 29 | Oct 11 | 165 d | 6a |
| Still River | Apr 29 | Oct 11 | 165 d | 6a |
| Stockbridge | May 7 | Oct 3 | 149 d | 5b |
| Stoneham | Apr 25 | Oct 17 | 175 d | 6b |
| Stoughton | Apr 25 | Oct 9 | 167 d | 6b |
| Stow | May 2 | Oct 6 | 157 d | 6b |
| Sturbridge | Apr 28 | Oct 15 | 170 d | 6a |
| Sudbury | May 2 | Oct 6 | 157 d | 6b |
| Sunderland | May 2 | Oct 9 | 160 d | 6a |
| Sutton | May 1 | Oct 10 | 162 d | 6b |
| Swampscott | Apr 25 | Oct 20 | 178 d | 7a |
| Swansea | Apr 11 | Nov 2 | 205 d | 7a |