South Dakota frost dates: C
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Camp Crook | May 17 | Sep 24 | 130 d | 4b |
| Canistota | Apr 30 | Oct 7 | 160 d | 5a |
| Canova | May 5 | Oct 2 | 150 d | 5a |
| Canton | May 2 | Oct 2 | 153 d | 5a |
| Caputa | May 12 | Oct 1 | 142 d | 5a |
| Carpenter | May 5 | Oct 5 | 153 d | 4b |
| Carthage | May 5 | Oct 2 | 150 d | 4b |
| Castlewood | May 10 | Sep 27 | 140 d | 4a |
| Cavour | May 6 | Oct 2 | 149 d | 4b |
| Centerville | May 2 | Oct 1 | 152 d | 5a |
| Chamberlain | May 1 | Oct 7 | 159 d | 5a |
| Chancellor | Apr 26 | Oct 13 | 170 d | 5a |
| Cherry Creek | May 6 | Oct 4 | 151 d | 4b |
| Chester | May 2 | Oct 5 | 156 d | 4b |
| Claire City | May 4 | Oct 3 | 152 d | 4b |
| Claremont | May 7 | Sep 29 | 145 d | 4a |
| Clark | May 5 | Oct 5 | 153 d | 4b |
| Clear Lake | May 7 | Oct 1 | 147 d | 4b |
| Colman | May 2 | Oct 5 | 156 d | 4b |
| Colome | May 1 | Oct 9 | 161 d | 5a |
| Colton | May 3 | Oct 4 | 154 d | 4b |
| Columbia | May 7 | Sep 29 | 145 d | 4a |
| Conde | May 6 | Sep 29 | 146 d | 4a |
| Corona | May 2 | Oct 4 | 155 d | 4b |
| Corsica | May 3 | Oct 6 | 156 d | 5a |
| Cresbard | May 10 | Sep 28 | 141 d | 4b |
| Crooks | Apr 26 | Oct 13 | 170 d | 5a |
| Custer | May 15 | Sep 29 | 137 d | 5a |