Maryland frost dates: S
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Sabillasville | Apr 14 | Oct 30 | 199 d | 7a |
| Saint Inigoes | Mar 30 | Nov 14 | 229 d | 8a |
| Saint James | Apr 11 | Oct 28 | 200 d | 7a |
| Saint Leonard | Mar 22 | Nov 26 | 249 d | 8a |
| Saint Marys City | Mar 30 | Nov 14 | 229 d | 8a |
| Saint Michaels | Apr 1 | Nov 7 | 220 d | 8a |
| Salisbury | Apr 3 | Nov 7 | 218 d | 7b |
| Sandy Spring | Apr 1 | Nov 6 | 219 d | 7b |
| Savage | Apr 5 | Nov 9 | 218 d | 7b |
| Scotland | Mar 30 | Nov 14 | 229 d | 8a |
| Secretary | Apr 8 | Nov 4 | 210 d | 7b |
| Severn | Apr 10 | Oct 31 | 204 d | 7b |
| Severna Park | Mar 27 | Nov 13 | 231 d | 8a |
| Shady Side | Mar 23 | Nov 20 | 242 d | 8a |
| Sharpsburg | Apr 26 | Oct 18 | 175 d | 7a |
| Sharptown | Apr 8 | Nov 4 | 210 d | 7b |
| Sherwood | Apr 1 | Nov 7 | 220 d | 8a |
| Showell | Apr 7 | Nov 2 | 209 d | 7b |
| Silver Spring | Apr 10 | Nov 1 | 205 d | 7b |
| Simpsonville | Apr 5 | Nov 9 | 218 d | 7b |
| Smithsburg | Apr 25 | Oct 19 | 177 d | 7a |
| Snow Hill | Apr 10 | Oct 31 | 204 d | 7b |
| Solomons | Mar 22 | Nov 26 | 249 d | 8a |
| Southern Md Facility | Apr 9 | Oct 29 | 203 d | 7b |
| Sparks Glencoe | Apr 19 | Oct 25 | 189 d | 7a |
| Sparrows Point | Mar 24 | Nov 21 | 242 d | 8a |
| Spencerville | Apr 5 | Nov 9 | 218 d | 7b |
| Spring Gap | Apr 15 | Oct 24 | 192 d | 7a |
| Stevenson | Apr 2 | Nov 7 | 219 d | 7b |
| Stevensville | Mar 29 | Nov 12 | 228 d | 8a |
| Still Pond | Apr 3 | Nov 5 | 216 d | 7b |
| Stockton | Mar 31 | Nov 11 | 225 d | 8a |
| Street | Apr 3 | Nov 6 | 217 d | 7a |
| Suburb Maryland Fac | Apr 1 | Nov 6 | 219 d | 7b |
| Sudlersville | Apr 3 | Nov 5 | 216 d | 7b |
| Suitland | Apr 3 | Nov 8 | 219 d | 7b |
| Sunderland | Apr 17 | Oct 27 | 193 d | 7b |
| Swanton | Apr 29 | Oct 20 | 174 d | 6a |
| Sykesville | Apr 2 | Nov 7 | 219 d | 7a |