Frost dates in Upton, WY
The average last spring frost in Upton is around May 22 and the first fall frost is around September 19. That gives Upton an average growing season of about 120 days.
Last spring frost
| Early (10% chance after) | May 5 |
|---|---|
| Average (50%) | May 22 |
| Late (90%) | June 14 |
First fall frost
| Early (10%) | September 4 |
|---|---|
| Average (50%) | September 19 |
| Late (90% chance before) | October 7 |