Frost dates in Idaho City, ID

The average last spring frost in Idaho City is around June 25 and the first fall frost is around September 1. That gives Idaho City an average growing season of about 68 days.

Last spring frost

Early (10% chance after)June 8
Average (50%)June 25
Late (90%)July 12

First fall frost

Early (10%)August 11
Average (50%)September 1
Late (90% chance before)September 17

See the Idaho City planting calendar →