Utah frost dates: O
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Oak City | May 2 | Oct 13 | 164 d | 6b |
| Oakley | Jun 5 | Sep 17 | 104 d | 5b |
| Ogden | Apr 21 | Oct 23 | 185 d | 7a |
| Orangeville | May 18 | Sep 27 | 132 d | 6a |
| Orderville | May 15 | Oct 8 | 146 d | 6b |
| Orem | Apr 18 | Oct 21 | 186 d | 7a |
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Oak City | May 2 | Oct 13 | 164 d | 6b |
| Oakley | Jun 5 | Sep 17 | 104 d | 5b |
| Ogden | Apr 21 | Oct 23 | 185 d | 7a |
| Orangeville | May 18 | Sep 27 | 132 d | 6a |
| Orderville | May 15 | Oct 8 | 146 d | 6b |
| Orem | Apr 18 | Oct 21 | 186 d | 7a |