Frost dates in Irwin, ID
The average last spring frost in Irwin is around June 25 and the first fall frost is around September 3. That gives Irwin an average growing season of about 70 days.
Last spring frost
| Early (10% chance after) | May 20 |
|---|---|
| Average (50%) | June 25 |
| Late (90%) | July 8 |
First fall frost
| Early (10%) | August 15 |
|---|---|
| Average (50%) | September 3 |
| Late (90% chance before) | September 23 |