Colorado frost dates: D
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Dacono | May 7 | Oct 5 | 151 d | 5b |
| De Beque | May 17 | Sep 30 | 136 d | 6b |
| Deer Trail | May 13 | Oct 2 | 142 d | 5b |
| Del Norte | May 23 | Sep 25 | 125 d | 5b |
| Delta | May 1 | Oct 7 | 159 d | 6b |
| Denver | Apr 30 | Oct 12 | 165 d | 6a |
| Dillon | frost any month | 5a | ||
| Dinosaur | May 2 | Oct 14 | 165 d | 6a |
| Dinosaur (Moffat) | May 10 | Oct 4 | 147 d | 5b |
| Divide | Jun 1 | Sep 21 | 112 d | 5b |
| Dolores | May 12 | Oct 7 | 148 d | 6a |
| Dove Creek | May 11 | Oct 12 | 154 d | 6b |
| Drake | May 30 | Sep 17 | 110 d | 5b |
| Dumont | May 30 | Sep 19 | 112 d | 5b |
| Dupont | May 4 | Oct 8 | 157 d | 6a |
| Durango | May 21 | Oct 2 | 134 d | 6b |