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

See the Challis planting calendar →