Frost dates in Grangeville, ID
The average last spring frost in Grangeville is around May 20 and the first fall frost is around September 22. That gives Grangeville an average growing season of about 125 days.
Last spring frost
| Early (10% chance after) | May 1 |
|---|---|
| Average (50%) | May 20 |
| Late (90%) | June 7 |
First fall frost
| Early (10%) | September 10 |
|---|---|
| Average (50%) | September 22 |
| Late (90% chance before) | October 17 |