Utah frost dates: S
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Saint George | Mar 14 | Nov 10 | 241 d | 8b |
| Salem | Apr 25 | Oct 18 | 176 d | 7a |
| Salina | May 21 | Sep 24 | 126 d | 6a |
| Salt Lake City | Apr 25 | Oct 18 | 176 d | 7b |
| Sandy | Apr 29 | Oct 22 | 176 d | 7b |
| Santa Clara | Mar 14 | Nov 10 | 241 d | 8a |
| Santaquin | May 4 | Oct 11 | 160 d | 6b |
| Saratoga Springs | Apr 30 | Oct 9 | 162 d | 7a |
| Scipio | May 22 | Sep 25 | 126 d | 5b |
| Sevier | Jun 4 | Sep 21 | 109 d | 6a |
| Sigurd | May 21 | Sep 24 | 126 d | 6a |
| Smithfield | May 8 | Oct 2 | 147 d | 6a |
| Snowville | May 17 | Sep 24 | 130 d | 6a |
| South Jordan | Apr 18 | Oct 22 | 187 d | 7a |
| Spanish Fork | Apr 25 | Oct 18 | 176 d | 6a |
| Spring City | May 26 | Sep 25 | 122 d | 6a |
| Springdale | Apr 13 | Nov 2 | 203 d | 6b |
| Springville | Apr 25 | Oct 18 | 176 d | 6b |
| Sterling | May 11 | Oct 6 | 148 d | 6a |
| Stockton | May 2 | Oct 16 | 167 d | 6b |
| Summit | Jun 21 | Sep 12 | 83 d | 6b |
| Sunnyside | Apr 26 | Oct 25 | 182 d | 6b |
| Syracuse | Apr 29 | Oct 20 | 174 d | 7b |