Frost dates in Hanna, WY
The average last spring frost in Hanna is around June 9 and the first fall frost is around September 8. That gives Hanna an average growing season of about 91 days.
Last spring frost
| Early (10% chance after) | May 20 |
|---|---|
| Average (50%) | June 9 |
| Late (90%) | June 27 |
First fall frost
| Early (10%) | August 22 |
|---|---|
| Average (50%) | September 8 |
| Late (90% chance before) | September 20 |