Ohio frost dates: C
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Cable | Apr 24 | Oct 19 | 178 d | 6a |
| Cadiz | Apr 21 | Oct 25 | 187 d | 6b |
| Cairo | Apr 24 | Oct 24 | 183 d | 6a |
| Caldwell | Apr 30 | Oct 14 | 167 d | 6b |
| Caledonia | Apr 24 | Oct 20 | 179 d | 6a |
| Cambridge | Apr 28 | Oct 17 | 172 d | 6b |
| Camden | Apr 25 | Oct 20 | 178 d | 6a |
| Cameron | Apr 26 | Oct 26 | 183 d | 6b |
| Camp Dennison | Apr 23 | Oct 18 | 178 d | 6b |
| Campbell | Apr 30 | Oct 23 | 176 d | 6a |
| Canal Fulton | Apr 24 | Oct 26 | 185 d | 6b |
| Canal Winchester | Apr 23 | Oct 19 | 179 d | 6b |
| Canfield | May 8 | Oct 12 | 157 d | 6a |
| Canton | Apr 24 | Oct 26 | 185 d | 6b |
| Carbon Hill | Apr 30 | Oct 14 | 167 d | 6a |
| Carbondale | Apr 25 | Oct 23 | 181 d | 6b |
| Cardington | Apr 24 | Oct 20 | 179 d | 6a |
| Carey | Apr 29 | Oct 17 | 171 d | 6a |
| Carroll | Apr 26 | Oct 13 | 170 d | 6b |
| Carrollton | May 2 | Oct 13 | 164 d | 6b |
| Casstown | Apr 18 | Oct 23 | 188 d | 6a |
| Castalia | Apr 10 | Nov 5 | 209 d | 6b |
| Catawba | Apr 24 | Oct 18 | 177 d | 6a |
| Cecil | Apr 25 | Oct 19 | 177 d | 6a |
| Cedarville | Apr 18 | Oct 24 | 189 d | 6a |
| Celina | Apr 27 | Oct 19 | 175 d | 6a |
| Centerburg | Apr 27 | Oct 17 | 173 d | 6a |
| Chagrin Falls | Apr 26 | Oct 31 | 188 d | 6a |
| Chandlersville | Apr 26 | Oct 19 | 176 d | 6b |
| Chardon | May 5 | Oct 18 | 166 d | 6a |
| Charm | May 2 | Oct 14 | 165 d | 6a |
| Chatfield | Apr 19 | Oct 27 | 191 d | 6a |
| Chauncey | Apr 25 | Oct 23 | 181 d | 6b |
| Cherry Fork | Apr 29 | Oct 11 | 165 d | 6b |
| Chesapeake | Apr 12 | Oct 30 | 201 d | 7a |
| Cheshire | Apr 18 | Oct 28 | 193 d | 6b |
| Chester | Apr 27 | Oct 14 | 170 d | 6b |
| Chesterhill | Apr 27 | Oct 21 | 177 d | 6b |
| Chesterland | Apr 26 | Oct 31 | 188 d | 6a |
| Chesterville | May 1 | Oct 10 | 162 d | 6a |
| Chickasaw | Apr 27 | Oct 19 | 175 d | 6a |
| Chillicothe | Apr 20 | Oct 22 | 185 d | 6b |
| Chilo | Apr 16 | Oct 31 | 198 d | 6b |
| Chippewa Lake | Apr 29 | Oct 19 | 173 d | 6a |
| Christiansburg | Apr 24 | Oct 17 | 176 d | 6a |
| Cincinnati | Apr 17 | Oct 26 | 192 d | 6b |
| Circleville | Apr 17 | Oct 28 | 194 d | 6b |
| Clarington | Apr 26 | Oct 26 | 183 d | 6b |
| Clarksburg | Apr 20 | Oct 22 | 185 d | 6b |
| Clarksville | Apr 17 | Oct 22 | 188 d | 6b |
| Clay Center | Apr 20 | Oct 27 | 190 d | 6b |
| Clayton | Apr 16 | Oct 28 | 195 d | 6a |
| Cleveland | Apr 8 | Nov 12 | 218 d | 7a |
| Cleves | Apr 16 | Oct 28 | 195 d | 6b |
| Clifton | Apr 25 | Oct 19 | 177 d | 6a |
| Clinton | Apr 24 | Oct 26 | 185 d | 6b |
| Cloverdale | Apr 25 | Oct 19 | 177 d | 6a |
| Clyde | Apr 26 | Oct 23 | 180 d | 6b |
| Coal Run | Apr 24 | Oct 22 | 181 d | 6b |
| Coalton | Apr 22 | Oct 21 | 182 d | 6b |
| Coldwater | Apr 27 | Oct 19 | 175 d | 6a |
| Colerain | Apr 18 | Nov 1 | 197 d | 7a |
| College Corner | Apr 25 | Oct 20 | 178 d | 6a |
| Collins | Apr 25 | Oct 25 | 183 d | 6a |
| Collinsville | Apr 22 | Oct 18 | 179 d | 6b |
| Colton | Apr 24 | Oct 21 | 180 d | 6a |
| Columbia Station | Apr 20 | Nov 3 | 197 d | 6b |
| Columbiana | May 2 | Oct 13 | 164 d | 6a |
| Columbus | Apr 20 | Oct 24 | 187 d | 6b |
| Columbus Grove | Apr 23 | Oct 22 | 182 d | 6a |
| Commercial Point | Apr 23 | Oct 19 | 179 d | 6b |
| Conesville | Apr 27 | Oct 18 | 174 d | 6b |
| Conneaut | May 8 | Oct 16 | 161 d | 6b |
| Conover | Apr 27 | Oct 20 | 176 d | 6a |
| Continental | Apr 22 | Oct 24 | 185 d | 6a |
| Convoy | Apr 21 | Oct 26 | 188 d | 6a |
| Coolville | Apr 14 | Oct 30 | 199 d | 6b |
| Corning | Apr 30 | Oct 17 | 170 d | 6a |
| Cortland | Apr 30 | Oct 23 | 176 d | 6a |
| Coshocton | Apr 27 | Oct 18 | 174 d | 6b |
| Covington | Apr 18 | Oct 23 | 188 d | 6a |
| Creola | Apr 30 | Oct 14 | 167 d | 6b |
| Crestline | Apr 26 | Oct 20 | 177 d | 6a |
| Creston | Apr 29 | Oct 19 | 173 d | 6a |
| Crooksville | Apr 30 | Oct 17 | 170 d | 6a |
| Croton | Apr 27 | Oct 17 | 173 d | 6a |
| Crown City | Apr 18 | Oct 29 | 194 d | 7a |
| Cuba | Apr 19 | Oct 22 | 186 d | 6b |
| Cumberland | Apr 28 | Oct 17 | 172 d | 6b |
| Curtice | Apr 20 | Oct 27 | 190 d | 6b |
| Custar | Apr 24 | Oct 21 | 180 d | 6a |
| Cutler | Apr 24 | Oct 22 | 181 d | 6b |
| Cuyahoga Falls | Apr 30 | Oct 21 | 174 d | 6b |
| Cygnet | Apr 24 | Oct 21 | 180 d | 6a |
| Cynthiana | Apr 24 | Oct 20 | 179 d | 6b |