Frost dates in Opal, WY
The average last spring frost in Opal is around June 22 and the first fall frost is around September 1. That gives Opal an average growing season of about 71 days.
Last spring frost
| Early (10% chance after) | May 29 |
|---|---|
| Average (50%) | June 22 |
| Late (90%) | July 13 |
First fall frost
| Early (10%) | August 8 |
|---|---|
| Average (50%) | September 1 |
| Late (90% chance before) | September 19 |