Oregon frost dates: C
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Camas Valley | Mar 31 | Nov 6 | 220 d | 9a |
| Camp Sherman | frost any month | 6b | ||
| Canby | Mar 18 | Nov 13 | 240 d | 8b |
| Cannon Beach | Apr 2 | Nov 12 | 224 d | 9a |
| Canyon City | May 28 | Sep 18 | 113 d | 6b |
| Canyonville | Mar 31 | Nov 6 | 220 d | 8b |
| Carlton | Apr 5 | Nov 7 | 216 d | 8b |
| Cascade Locks | Mar 24 | Nov 20 | 241 d | 8a |
| Cascadia | Apr 29 | Oct 13 | 167 d | 8b |
| Cave Junction | May 1 | Oct 12 | 164 d | 8b |
| Central Point | Apr 8 | Oct 29 | 204 d | 8b |
| Chemult | frost any month | 6a | ||
| Cheshire | Apr 11 | Oct 23 | 195 d | 8b |
| Chiloquin | frost any month | 6a | ||
| Christmas Valley | frost any month | 6a | ||
| Clackamas | Mar 18 | Nov 18 | 245 d | 9a |
| Clatskanie | Apr 24 | Oct 24 | 183 d | 8b |
| Cloverdale | Mar 17 | Nov 22 | 250 d | 9a |
| Colton | Mar 16 | Nov 19 | 248 d | 8b |
| Columbia City | Apr 18 | Nov 7 | 203 d | 8b |
| Condon | May 10 | Oct 7 | 150 d | 7a |
| Coos Bay | Mar 28 | Nov 6 | 223 d | 9a |
| Coquille | Mar 28 | Nov 6 | 223 d | 9a |
| Corbett | Mar 27 | Nov 18 | 236 d | 8b |
| Cornelius | Apr 16 | Oct 26 | 193 d | 8b |
| Corvallis | Apr 17 | Oct 28 | 194 d | 8b |
| Cottage Grove | Apr 24 | Oct 25 | 184 d | 8b |
| Cove | May 11 | Sep 26 | 138 d | 6b |
| Crabtree | Mar 14 | Nov 18 | 249 d | 8b |
| Crane | Jun 7 | Sep 6 | 91 d | 6a |
| Crater Lake | frost any month | 6b | ||
| Crawfordsville | Apr 12 | Oct 28 | 199 d | 8b |
| Crescent | frost any month | 6b | ||
| Creswell | Apr 24 | Oct 25 | 184 d | 8b |
| Culver | May 19 | Oct 4 | 138 d | 7a |