Frost dates in Clear Lake, IA

The average last spring frost in Clear Lake is around May 3 and the first fall frost is around October 2. That gives Clear Lake an average growing season of about 152 days.

Last spring frost

Early (10% chance after)April 20
Average (50%)May 3
Late (90%)May 17

First fall frost

Early (10%)September 21
Average (50%)October 2
Late (90% chance before)October 15

See the Clear Lake planting calendar →