Ohio frost dates: D
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Dalton | Apr 24 | Oct 21 | 180 d | 6a |
| Damascus | May 2 | Oct 13 | 164 d | 6b |
| Danville | May 2 | Oct 8 | 159 d | 6a |
| Dayton | Apr 18 | Oct 25 | 190 d | 6b |
| De Graff | Apr 26 | Oct 20 | 177 d | 6a |
| Decatur | Apr 29 | Oct 11 | 165 d | 6b |
| Deerfield | Apr 21 | Oct 29 | 191 d | 6a |
| Deersville | Apr 21 | Oct 25 | 187 d | 6b |
| Defiance | Apr 22 | Oct 24 | 185 d | 6a |
| Delaware | Apr 19 | Oct 26 | 190 d | 6b |
| Dellroy | Apr 30 | Oct 15 | 168 d | 6b |
| Delphos | Apr 24 | Oct 24 | 183 d | 6a |
| Delta | Apr 29 | Oct 16 | 170 d | 6a |
| Dennison | Apr 29 | Oct 15 | 169 d | 6b |
| Derby | Apr 17 | Oct 28 | 194 d | 6b |
| Derwent | Apr 28 | Oct 17 | 172 d | 6b |
| Deshler | Apr 24 | Oct 21 | 180 d | 6a |
| Dexter City | Apr 30 | Oct 14 | 167 d | 6b |
| Diamond | Apr 21 | Oct 29 | 191 d | 6a |
| Dillonvale | Apr 18 | Nov 1 | 197 d | 6b |
| Dola | Apr 22 | Oct 24 | 185 d | 6a |
| Donnelsville | Apr 24 | Oct 17 | 176 d | 6a |
| Dorset | May 10 | Oct 10 | 153 d | 6a |
| Dover | Apr 30 | Oct 15 | 168 d | 6b |
| Doylestown | Apr 29 | Oct 14 | 168 d | 6b |
| Dresden | Apr 27 | Oct 18 | 174 d | 6a |
| Dublin | Apr 22 | Oct 23 | 184 d | 6b |
| Dunbridge | Apr 22 | Oct 25 | 186 d | 6b |
| Duncan Falls | Apr 19 | Oct 25 | 189 d | 6b |
| Dundee | Apr 30 | Oct 15 | 168 d | 6a |
| Dunkirk | Apr 22 | Oct 24 | 185 d | 6a |
| Dupont | Apr 25 | Oct 19 | 177 d | 6a |