Pennsylvania frost dates: D
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Dagus Mines | May 13 | Oct 11 | 151 d | 5b |
| Daisytown | Apr 13 | Nov 5 | 206 d | 6b |
| Dallas | Apr 23 | Oct 20 | 180 d | 6a |
| Dallastown | Apr 26 | Oct 19 | 176 d | 7a |
| Dalmatia | Apr 25 | Oct 22 | 180 d | 6b |
| Dalton | Apr 23 | Oct 20 | 180 d | 6a |
| Damascus | May 3 | Oct 9 | 159 d | 6a |
| Danboro | Apr 13 | Oct 30 | 200 d | 7a |
| Danielsville | Apr 21 | Oct 23 | 185 d | 6b |
| Danville | Apr 27 | Oct 20 | 176 d | 6b |
| Darby | Apr 2 | Nov 10 | 222 d | 7b |
| Darlington | Apr 27 | Oct 25 | 181 d | 6b |
| Darragh | May 1 | Oct 13 | 165 d | 6b |
| Dauphin | Apr 15 | Oct 23 | 191 d | 7a |
| Davidsville | Apr 29 | Oct 21 | 175 d | 6a |
| Dawson | Apr 22 | Oct 27 | 188 d | 6b |
| Dayton | May 10 | Oct 12 | 155 d | 6a |
| De Lancey | May 6 | Oct 14 | 161 d | 6a |
| De Young | May 13 | Oct 11 | 151 d | 5b |
| Defiance | Apr 23 | Oct 21 | 181 d | 6b |
| Delano | Apr 30 | Oct 22 | 175 d | 6b |
| Delaware Water Gap | May 1 | Oct 12 | 164 d | 6b |
| Delmont | Apr 29 | Oct 20 | 174 d | 6b |
| Delta | Apr 3 | Nov 6 | 217 d | 7a |
| Denbo | Apr 13 | Nov 5 | 206 d | 6b |
| Denver | Apr 14 | Nov 1 | 201 d | 7a |
| Derrick City | May 7 | Oct 11 | 157 d | 5b |
| Derry | May 2 | Oct 14 | 165 d | 6b |
| Devault | Apr 18 | Oct 27 | 192 d | 7a |
| Devon | Apr 8 | Oct 31 | 206 d | 7a |
| Dewart | Apr 24 | Oct 23 | 182 d | 6b |
| Dickerson Run | Apr 22 | Oct 27 | 188 d | 6b |
| Dilliner | Apr 28 | Oct 21 | 176 d | 6b |
| Dillsburg | Apr 23 | Oct 18 | 178 d | 7a |
| Dilltown | May 8 | Oct 13 | 158 d | 6b |
| Dimock | May 14 | Oct 2 | 141 d | 6a |
| Dingmans Ferry | Apr 30 | Oct 11 | 164 d | 6b |
| Distant | May 10 | Oct 12 | 155 d | 6a |
| Dixonville | May 8 | Oct 13 | 158 d | 6a |
| Donegal | Apr 30 | Oct 17 | 170 d | 6a |
| Donora | Apr 27 | Oct 22 | 178 d | 6b |
| Dornsife | Apr 25 | Oct 22 | 180 d | 6b |
| Douglassville | Apr 20 | Oct 23 | 186 d | 7a |
| Dover | Apr 27 | Oct 18 | 174 d | 7a |
| Downingtown | Apr 26 | Oct 18 | 175 d | 7a |
| Doylesburg | Apr 19 | Oct 24 | 188 d | 7a |
| Doylestown | Apr 13 | Oct 30 | 200 d | 7a |
| Dravosburg | Apr 18 | Oct 28 | 193 d | 6b |
| Dresher | Apr 11 | Nov 1 | 204 d | 7b |
| Drexel Hill | Apr 2 | Nov 10 | 222 d | 7b |
| Drifting | May 21 | Sep 27 | 129 d | 6a |
| Drifton | May 7 | Oct 6 | 152 d | 6b |
| Driftwood | May 10 | Oct 16 | 159 d | 6a |
| Drumore | Apr 1 | Nov 10 | 223 d | 7a |
| Drums | May 7 | Oct 6 | 152 d | 6b |
| Dry Run | Apr 19 | Oct 24 | 188 d | 7a |
| Du Bois | May 6 | Oct 14 | 161 d | 6a |
| Dublin | Apr 13 | Oct 30 | 200 d | 7a |
| Dudley | Apr 23 | Oct 21 | 181 d | 6b |
| Duke Center | May 7 | Oct 11 | 157 d | 5b |
| Dunbar | Apr 22 | Oct 27 | 188 d | 6a |
| Duncannon | Apr 15 | Oct 23 | 191 d | 7a |
| Duncansville | Apr 25 | Oct 20 | 178 d | 6b |
| Dunlevy | Apr 13 | Nov 5 | 206 d | 6b |
| Dunlo | Apr 29 | Oct 21 | 175 d | 6b |
| Duquesne | Apr 5 | Nov 10 | 219 d | 6b |
| Durham | Apr 21 | Oct 22 | 184 d | 7a |
| Duryea | Apr 23 | Oct 20 | 180 d | 7a |
| Dushore | May 14 | Oct 2 | 141 d | 6a |
| Dysart | May 10 | Oct 5 | 148 d | 6a |