Frost dates in Superior, WY
The average last spring frost in Superior is around May 28 and the first fall frost is around September 22. That gives Superior an average growing season of about 117 days.
Last spring frost
| Early (10% chance after) | May 7 |
|---|---|
| Average (50%) | May 28 |
| Late (90%) | June 13 |
First fall frost
| Early (10%) | September 11 |
|---|---|
| Average (50%) | September 22 |
| Late (90% chance before) | October 9 |