Frost dates in Kirby, WY
The average last spring frost in Kirby is around May 22 and the first fall frost is around September 18. That gives Kirby an average growing season of about 119 days.
Last spring frost
| Early (10% chance after) | May 10 |
|---|---|
| Average (50%) | May 22 |
| Late (90%) | June 14 |
First fall frost
| Early (10%) | September 9 |
|---|---|
| Average (50%) | September 18 |
| Late (90% chance before) | September 25 |