Utah frost dates: L
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| La Sal | May 17 | Oct 6 | 142 d | 7a |
| La Verkin | Apr 1 | Nov 5 | 218 d | 8a |
| Lake Powell | Mar 9 | Nov 20 | 256 d | 8a |
| Laketown | May 28 | Sep 24 | 119 d | 5b |
| Lapoint | May 19 | Oct 2 | 136 d | 5b |
| Layton | Apr 29 | Oct 20 | 174 d | 7a |
| Leamington | May 2 | Oct 13 | 164 d | 6a |
| Leeds | Apr 1 | Nov 5 | 218 d | 8b |
| Lehi | Apr 30 | Oct 9 | 162 d | 6b |
| Levan | May 10 | Oct 7 | 150 d | 6a |
| Lewiston | May 17 | Sep 18 | 124 d | 6a |
| Lindon | Apr 17 | Oct 25 | 191 d | 7a |
| Loa | May 31 | Sep 21 | 113 d | 6a |
| Logan | May 8 | Oct 2 | 147 d | 6a |
| Lyman | May 31 | Sep 21 | 113 d | 6a |
| Lynndyl | May 2 | Oct 13 | 164 d | 6a |