Frost dates in Swan Valley, ID
The average last spring frost in Swan Valley is around June 25 and the first fall frost is around September 3. That gives Swan Valley 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 |