Frost dates in Iona, ID

The average last spring frost in Iona is around May 20 and the first fall frost is around September 22. That gives Iona an average growing season of about 125 days.

Last spring frost

Early (10% chance after)April 30
Average (50%)May 20
Late (90%)June 13

First fall frost

Early (10%)September 8
Average (50%)September 22
Late (90% chance before)October 14

See the Iona planting calendar →