Utah frost dates: C
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Cache Junction | May 3 | Oct 12 | 162 d | 6a |
| Cannonville | May 31 | Sep 28 | 120 d | 6a |
| Castle Dale | May 18 | Sep 27 | 132 d | 6a |
| Cedar City | May 4 | Oct 13 | 162 d | 6b |
| Cedar Valley | Jun 2 | Sep 16 | 106 d | 6a |
| Centerfield | May 31 | Sep 21 | 113 d | 6a |
| Centerville | Apr 25 | Oct 24 | 182 d | 6b |
| Central | Apr 9 | Nov 5 | 210 d | 6b |
| Chester | May 26 | Sep 25 | 122 d | 5b |
| Circleville | May 23 | Sep 27 | 127 d | 5b |
| Cisco | Apr 27 | Oct 9 | 165 d | 6b |
| Clarkston | May 3 | Oct 12 | 162 d | 6a |
| Clawson | May 6 | Oct 10 | 157 d | 6a |
| Clearfield | Apr 19 | Oct 19 | 183 d | 7a |
| Cleveland | May 18 | Sep 27 | 132 d | 6a |
| Coalville | Jun 11 | Sep 12 | 93 d | 5b |
| Collinston | May 3 | Oct 12 | 162 d | 6a |
| Corinne | May 5 | Oct 5 | 153 d | 6b |
| Cornish | May 17 | Sep 18 | 124 d | 6a |
| Croydon | May 30 | Sep 18 | 111 d | 6a |