Colorado frost dates: H
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Hamilton | May 29 | Sep 20 | 114 d | 5b |
| Hartman | May 1 | Oct 12 | 164 d | 6a |
| Hartsel | frost any month | 4a | ||
| Hasty | Apr 24 | Oct 15 | 174 d | 6a |
| Haswell | Apr 30 | Oct 13 | 166 d | 5b |
| Haxtun | May 4 | Oct 11 | 160 d | 5b |
| Hayden | Jun 1 | Sep 20 | 111 d | 5a |
| Henderson | May 3 | Oct 7 | 157 d | 5b |
| Hereford | May 14 | Sep 26 | 135 d | 5a |
| Hesperus | Jun 1 | Sep 27 | 118 d | 6a |
| Hillrose | May 15 | Oct 1 | 139 d | 5b |
| Hillside | Jun 11 | Sep 9 | 90 d | 5b |
| Hoehne | May 4 | Oct 9 | 158 d | 6a |
| Holly | May 1 | Oct 12 | 164 d | 6a |
| Holyoke | May 11 | Oct 3 | 145 d | 5b |
| Homelake | Jun 11 | Sep 13 | 94 d | 4b |
| Hooper | May 24 | Sep 24 | 123 d | 5a |
| Hot Sulphur Springs | Jun 12 | Sep 10 | 90 d | 5b |
| Hotchkiss | May 3 | Oct 12 | 162 d | 6b |
| Howard | May 29 | Sep 20 | 114 d | 5b |
| Hudson | May 3 | Oct 7 | 157 d | 5b |
| Hugo | May 10 | Oct 2 | 145 d | 5b |
| Hygiene | May 7 | Oct 5 | 151 d | 6a |