Frost dates in Idaho City, ID
The average last spring frost in Idaho City is around June 25 and the first fall frost is around September 1. That gives Idaho City an average growing season of about 68 days.
Last spring frost
| Early (10% chance after) | June 8 |
|---|---|
| Average (50%) | June 25 |
| Late (90%) | July 12 |
First fall frost
| Early (10%) | August 11 |
|---|---|
| Average (50%) | September 1 |
| Late (90% chance before) | September 17 |