Frost dates in Rock River, WY
The average last spring frost in Rock River is around June 4 and the first fall frost is around September 8. That gives Rock River an average growing season of about 96 days.
Last spring frost
| Early (10% chance after) | May 14 |
|---|---|
| Average (50%) | June 4 |
| Late (90%) | June 27 |
First fall frost
| Early (10%) | August 25 |
|---|---|
| Average (50%) | September 8 |
| Late (90% chance before) | September 24 |