Colorado frost dates: Y
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Yampa | Jun 14 | Sep 11 | 89 d | 5a |
| Yellow Jacket | May 17 | Oct 9 | 145 d | 6b |
| Yoder | May 9 | Oct 4 | 148 d | 6a |
| Yuma | May 1 | Oct 12 | 164 d | 5b |
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Yampa | Jun 14 | Sep 11 | 89 d | 5a |
| Yellow Jacket | May 17 | Oct 9 | 145 d | 6b |
| Yoder | May 9 | Oct 4 | 148 d | 6a |
| Yuma | May 1 | Oct 12 | 164 d | 5b |