North Dakota frost dates: C
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Caledonia | May 2 | Oct 9 | 160 d | 4a |
| Calvin | May 18 | Sep 23 | 128 d | 3b |
| Cando | May 15 | Sep 27 | 135 d | 3b |
| Cannon Ball | May 12 | Sep 27 | 138 d | 4a |
| Carpio | May 11 | Sep 29 | 141 d | 4a |
| Carrington | May 10 | Sep 28 | 141 d | 4a |
| Carson | May 19 | Sep 25 | 129 d | 4a |
| Cartwright | May 11 | Sep 27 | 139 d | 4a |
| Casselton | May 9 | Oct 1 | 145 d | 4a |
| Cathay | May 13 | Sep 28 | 138 d | 4a |
| Cavalier | May 12 | Sep 30 | 141 d | 4a |
| Cayuga | May 7 | Oct 1 | 147 d | 4b |
| Center | May 11 | Sep 29 | 141 d | 4a |
| Chaseley | May 13 | Sep 29 | 139 d | 4a |
| Christine | May 4 | Oct 2 | 151 d | 4a |
| Churchs Ferry | May 15 | Sep 27 | 135 d | 4a |
| Cleveland | May 6 | Oct 4 | 151 d | 4b |
| Clifford | May 13 | Sep 27 | 137 d | 4a |
| Cogswell | May 7 | Oct 1 | 147 d | 4a |
| Coleharbor | May 10 | Sep 29 | 142 d | 4a |
| Colfax | May 6 | Sep 29 | 146 d | 4a |
| Columbus | May 18 | Sep 17 | 122 d | 3b |
| Cooperstown | May 17 | Sep 23 | 129 d | 4a |
| Courtenay | May 11 | Sep 28 | 140 d | 4a |
| Crary | May 6 | Oct 5 | 152 d | 4a |
| Crosby | May 17 | Sep 23 | 129 d | 4a |
| Crystal | May 4 | Oct 7 | 156 d | 4a |
| Cummings | May 2 | Oct 9 | 160 d | 4a |