Colorado frost dates: K
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Karval | May 9 | Oct 6 | 150 d | 5b |
| Keenesburg | May 5 | Oct 9 | 157 d | 5b |
| Kersey | May 2 | Oct 8 | 159 d | 5a |
| Kim | May 5 | Oct 9 | 157 d | 6a |
| Kiowa | May 16 | Oct 2 | 139 d | 5b |
| Kirk | May 3 | Oct 9 | 159 d | 5b |
| Kit Carson | May 10 | Oct 1 | 144 d | 5b |
| Kittredge | May 23 | Sep 22 | 122 d | 5b |
| Kremmling | Jun 14 | Sep 5 | 83 d | 5a |