Frost dates in Greybull, WY
The average last spring frost in Greybull is around May 13 and the first fall frost is around September 25. That gives Greybull an average growing season of about 135 days.
Last spring frost
| Early (10% chance after) | April 27 |
|---|---|
| Average (50%) | May 13 |
| Late (90%) | May 20 |
First fall frost
| Early (10%) | September 13 |
|---|---|
| Average (50%) | September 25 |
| Late (90% chance before) | October 9 |