Frost dates in Basalt, ID
The average last spring frost in Basalt is around May 23 and the first fall frost is around September 21. That gives Basalt an average growing season of about 121 days.
Last spring frost
| Early (10% chance after) | April 30 |
|---|---|
| Average (50%) | May 23 |
| Late (90%) | June 15 |
First fall frost
| Early (10%) | September 3 |
|---|---|
| Average (50%) | September 21 |
| Late (90% chance before) | October 17 |