Oregon frost dates: D
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Dairy | Jun 9 | Sep 18 | 101 d | 6b |
| Dallas | Apr 16 | Nov 1 | 199 d | 8b |
| Damascus | Mar 18 | Nov 18 | 245 d | 8b |
| Days Creek | Mar 31 | Nov 6 | 220 d | 8b |
| Dayton | Apr 15 | Oct 26 | 194 d | 8b |
| Dayville | May 4 | Oct 6 | 155 d | 7a |
| Deadwood | Feb 15 | Dec 9 | 297 d | 9a |
| Deer Island | Apr 18 | Nov 7 | 203 d | 8b |
| Depoe Bay | Mar 12 | Dec 10 | 273 d | 9a |
| Detroit | Mar 9 | Dec 3 | 269 d | 7b |
| Dexter | Mar 7 | Nov 27 | 265 d | 9a |
| Diamond | May 29 | Sep 18 | 112 d | 6a |
| Dillard | Mar 23 | Nov 18 | 240 d | 9a |
| Donald | Mar 16 | Nov 14 | 243 d | 8b |
| Dorena | Apr 16 | Oct 28 | 195 d | 8b |
| Drain | Apr 16 | Oct 25 | 192 d | 8b |
| Drewsey | Jun 5 | Sep 5 | 92 d | 6a |
| Dufur | May 12 | Oct 7 | 148 d | 7b |
| Dundee | Mar 21 | Nov 22 | 246 d | 8b |
| Durkee | Apr 23 | Oct 13 | 173 d | 6b |