Frost dates in Ketchum, ID
The average last spring frost in Ketchum is around June 23 and the first fall frost is around September 3. That gives Ketchum an average growing season of about 72 days.
Last spring frost
| Early (10% chance after) | June 4 |
|---|---|
| Average (50%) | June 23 |
| Late (90%) | July 21 |
First fall frost
| Early (10%) | August 8 |
|---|---|
| Average (50%) | September 3 |
| Late (90% chance before) | September 16 |