Frost dates in Challis, ID
The average last spring frost in Challis is around May 25 and the first fall frost is around September 20. That gives Challis an average growing season of about 118 days.
Last spring frost
| Early (10% chance after) | May 10 |
|---|---|
| Average (50%) | May 25 |
| Late (90%) | June 12 |
First fall frost
| Early (10%) | September 8 |
|---|---|
| Average (50%) | September 20 |
| Late (90% chance before) | October 7 |