Pennsylvania frost dates: C
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Cabot | May 7 | Oct 14 | 160 d | 6a |
| Cadogan | May 4 | Oct 16 | 165 d | 6b |
| Cairnbrook | May 4 | Oct 10 | 159 d | 6a |
| California | Apr 13 | Nov 5 | 206 d | 6b |
| Callensburg | May 9 | Oct 11 | 155 d | 6a |
| Callery | May 7 | Oct 14 | 160 d | 6b |
| Calumet | May 1 | Oct 13 | 165 d | 6b |
| Calvin | Apr 19 | Oct 28 | 192 d | 6b |
| Cambra | May 4 | Oct 11 | 160 d | 6b |
| Cambridge Springs | May 7 | Oct 10 | 156 d | 6a |
| Camp Hill | Apr 15 | Oct 23 | 191 d | 7a |
| Campbelltown | Apr 20 | Oct 25 | 188 d | 7a |
| Camptown | May 2 | Oct 15 | 166 d | 6a |
| Canadensis | May 6 | Oct 8 | 155 d | 6a |
| Canonsburg | Apr 24 | Oct 23 | 182 d | 6b |
| Canton | May 16 | Oct 2 | 139 d | 6a |
| Carbondale | May 14 | Oct 1 | 140 d | 6a |
| Cardale | Apr 30 | Oct 18 | 171 d | 6b |
| Carlisle | Apr 23 | Oct 18 | 178 d | 7a |
| Carlton | May 2 | Oct 23 | 174 d | 6a |
| Carmichaels | Apr 28 | Oct 21 | 176 d | 6b |
| Carnegie | Apr 24 | Oct 27 | 186 d | 6b |
| Carrolltown | May 17 | Oct 2 | 138 d | 6a |
| Carversville | Apr 13 | Oct 30 | 200 d | 7a |
| Cashtown | Apr 28 | Oct 17 | 172 d | 7a |
| Cassandra | May 17 | Oct 2 | 138 d | 6a |
| Cassville | Apr 19 | Oct 28 | 192 d | 6b |
| Castanea | Apr 30 | Oct 20 | 173 d | 6b |
| Catasauqua | Apr 20 | Oct 24 | 187 d | 7a |
| Catawissa | Apr 27 | Oct 20 | 176 d | 6b |
| Cecil | Apr 24 | Oct 23 | 182 d | 6b |
| Cedar Run | May 10 | Oct 5 | 148 d | 6a |
| Cedars | Apr 24 | Oct 15 | 174 d | 7a |
| Center Valley | Apr 20 | Oct 24 | 187 d | 7a |
| Centerport | Apr 16 | Oct 25 | 192 d | 7a |
| Centerville | May 12 | Oct 10 | 151 d | 6a |
| Central City | May 4 | Oct 10 | 159 d | 6a |
| Centre Hall | Apr 20 | Oct 26 | 189 d | 6b |
| Chadds Ford | Apr 7 | Nov 4 | 211 d | 7a |
| Chalfont | Apr 13 | Oct 30 | 200 d | 7a |
| Chalk Hill | May 19 | Oct 1 | 135 d | 6a |
| Chambersburg | Apr 18 | Oct 25 | 190 d | 7a |
| Chambersville | May 8 | Oct 13 | 158 d | 6b |
| Champion | May 2 | Oct 17 | 168 d | 6a |
| Chandlers Valley | May 22 | Sep 30 | 131 d | 5b |
| Charleroi | Apr 13 | Nov 5 | 206 d | 6b |
| Chatham | Apr 19 | Oct 26 | 190 d | 7a |
| Cheltenham | Apr 4 | Nov 7 | 217 d | 7b |
| Cherry Tree | May 10 | Oct 5 | 148 d | 6a |
| Cherryville | Apr 20 | Oct 24 | 187 d | 6b |
| Chest Springs | May 10 | Oct 5 | 148 d | 6a |
| Chester | Mar 30 | Nov 16 | 231 d | 7b |
| Chester Heights | Mar 30 | Nov 16 | 231 d | 7b |
| Chester Springs | Apr 11 | Nov 1 | 204 d | 7a |
| Chestnut Ridge | Apr 30 | Oct 18 | 171 d | 6b |
| Cheswick | Apr 16 | Nov 1 | 199 d | 6b |
| Cheyney | Apr 26 | Oct 18 | 175 d | 7a |
| Chicora | May 7 | Oct 14 | 160 d | 6a |
| Chinchilla | Apr 23 | Oct 20 | 180 d | 6a |
| Christiana | Apr 26 | Oct 22 | 179 d | 7a |
| Clairton | Apr 18 | Oct 28 | 193 d | 6b |
| Clarence | May 21 | Sep 27 | 129 d | 6a |
| Clarendon | May 4 | Oct 21 | 170 d | 6a |
| Claridge | Apr 22 | Oct 25 | 186 d | 6b |
| Clarington | May 13 | Oct 7 | 147 d | 6a |
| Clarion | May 9 | Oct 11 | 155 d | 6a |
| Clark | May 15 | Oct 3 | 141 d | 6a |
| Clarks Mills | May 15 | Oct 3 | 141 d | 6a |
| Clarks Summit | Apr 23 | Oct 20 | 180 d | 6a |
| Clarksburg | May 2 | Oct 14 | 165 d | 6b |
| Clarksville | May 3 | Oct 15 | 165 d | 6b |
| Claysburg | Apr 23 | Oct 21 | 181 d | 6b |
| Claysville | Apr 24 | Oct 23 | 182 d | 6b |
| Clearfield | May 4 | Oct 11 | 160 d | 6a |
| Clearville | Apr 27 | Oct 17 | 173 d | 6b |
| Clifford | May 14 | Oct 1 | 140 d | 6a |
| Clifton Heights | Apr 2 | Nov 10 | 222 d | 7b |
| Clinton | Apr 28 | Oct 18 | 173 d | 6b |
| Clintonville | May 7 | Oct 14 | 160 d | 6a |
| Clune | May 2 | Oct 14 | 165 d | 6b |
| Clymer | May 8 | Oct 13 | 158 d | 6a |
| Coal Center | Apr 13 | Nov 5 | 206 d | 6b |
| Coal Township | Apr 27 | Oct 20 | 176 d | 6b |
| Coaldale | Apr 21 | Oct 23 | 185 d | 6b |
| Coalport | May 10 | Oct 5 | 148 d | 6a |
| Coatesville | Apr 19 | Oct 25 | 189 d | 7a |
| Coburn | May 5 | Oct 6 | 154 d | 6b |
| Cochranton | Apr 30 | Oct 23 | 176 d | 6a |
| Cochranville | Apr 19 | Oct 26 | 190 d | 7a |
| Cocolamus | Apr 25 | Oct 19 | 177 d | 6b |
| Codorus | Apr 26 | Oct 19 | 176 d | 7a |
| Cogan Station | Apr 25 | Oct 24 | 182 d | 6a |
| Cokeburg | Apr 24 | Oct 23 | 182 d | 6b |
| Collegeville | Apr 24 | Oct 15 | 174 d | 7a |
| Colmar | Apr 26 | Oct 17 | 174 d | 7a |
| Columbia | Apr 30 | Oct 10 | 163 d | 7a |
| Columbia Cross Roads | May 16 | Oct 2 | 139 d | 6a |
| Columbus | May 22 | Sep 30 | 131 d | 6a |
| Colver | May 17 | Oct 2 | 138 d | 6a |
| Commodore | May 8 | Oct 13 | 158 d | 6a |
| Concord | Apr 19 | Oct 24 | 188 d | 7a |
| Concordville | Mar 30 | Nov 16 | 231 d | 7a |
| Conestoga | Apr 1 | Nov 10 | 223 d | 7a |
| Confluence | Apr 30 | Oct 18 | 171 d | 6a |
| Conneaut Lake | Apr 30 | Oct 23 | 176 d | 6a |
| Conneautville | May 8 | Oct 16 | 161 d | 6a |
| Connellsville | Apr 22 | Oct 27 | 188 d | 6b |
| Connoquenessing | May 7 | Oct 14 | 160 d | 6b |
| Conshohocken | Apr 8 | Oct 31 | 206 d | 7b |
| Conway | Apr 27 | Oct 25 | 181 d | 6b |
| Conyngham | Apr 30 | Oct 22 | 175 d | 6b |
| Cooksburg | May 13 | Oct 7 | 147 d | 6a |
| Coolspring | May 10 | Oct 12 | 155 d | 6a |
| Coopersburg | Apr 21 | Oct 22 | 184 d | 7a |
| Cooperstown | May 2 | Oct 23 | 174 d | 6a |
| Coplay | Apr 20 | Oct 24 | 187 d | 7a |
| Coral | May 8 | Oct 13 | 158 d | 6b |
| Coraopolis | Apr 23 | Oct 23 | 183 d | 6b |
| Cornwall | Apr 20 | Oct 25 | 188 d | 7a |
| Corry | May 7 | Oct 10 | 156 d | 6a |
| Corsica | May 9 | Oct 11 | 155 d | 6a |
| Coudersport | May 14 | Oct 4 | 143 d | 5b |
| Coulters | Apr 24 | Oct 27 | 186 d | 6b |
| Coupon | Apr 25 | Oct 21 | 179 d | 6b |
| Covington | May 6 | Oct 10 | 157 d | 6a |
| Cowansville | May 4 | Oct 16 | 165 d | 6b |
| Crabtree | May 2 | Oct 14 | 165 d | 6b |
| Craley | Apr 1 | Nov 10 | 223 d | 7a |
| Cranberry | May 2 | Oct 23 | 174 d | 6a |
| Cranberry Township | Apr 8 | Nov 8 | 214 d | 6b |
| Cranesville | May 8 | Oct 16 | 161 d | 6a |
| Creamery | Apr 24 | Oct 15 | 174 d | 7a |
| Creekside | May 8 | Oct 13 | 158 d | 6b |
| Creighton | Apr 16 | Nov 1 | 199 d | 6b |
| Crescent | Apr 8 | Nov 8 | 214 d | 7a |
| Cresco | May 6 | Oct 8 | 155 d | 6b |
| Cresson | May 17 | Oct 2 | 138 d | 6a |
| Cressona | Apr 16 | Oct 25 | 192 d | 7a |
| Crosby | May 15 | Oct 3 | 141 d | 5b |
| Cross Fork | Apr 29 | Oct 21 | 175 d | 5b |
| Crown | May 13 | Oct 7 | 147 d | 6a |
| Croydon | Apr 21 | Oct 25 | 187 d | 7b |
| Crucible | May 3 | Oct 15 | 165 d | 6b |
| Crum Lynne | Apr 2 | Nov 10 | 222 d | 8a |
| Crystal Spring | Apr 27 | Oct 17 | 173 d | 6b |
| Cuddy | Apr 23 | Oct 23 | 183 d | 6b |
| Cumbola | Apr 30 | Oct 22 | 175 d | 6b |
| Curllsville | May 9 | Oct 11 | 155 d | 6a |
| Curryville | Apr 23 | Oct 21 | 181 d | 6b |
| Curtisville | Apr 16 | Nov 2 | 200 d | 6b |
| Curwensville | May 4 | Oct 13 | 162 d | 6a |
| Custer City | May 18 | Oct 4 | 139 d | 5b |
| Cyclone | May 18 | Oct 1 | 136 d | 5b |