Frost dates in Gillette, WY
The average last spring frost in Gillette is around May 19 and the first fall frost is around September 25. That gives Gillette an average growing season of about 129 days.
Last spring frost
| Early (10% chance after) | May 1 |
|---|---|
| Average (50%) | May 19 |
| Late (90%) | June 3 |
First fall frost
| Early (10%) | September 9 |
|---|---|
| Average (50%) | September 25 |
| Late (90% chance before) | October 10 |