Frost dates in Cheyenne, WY
The average last spring frost in Cheyenne is around May 13 and the first fall frost is around October 6. That gives Cheyenne an average growing season of about 146 days.
Last spring frost
| Early (10% chance after) | May 6 |
|---|---|
| Average (50%) | May 13 |
| Late (90%) | May 22 |
First fall frost
| Early (10%) | September 17 |
|---|---|
| Average (50%) | October 6 |
| Late (90% chance before) | October 23 |