Frost dates in Winterset, IA

The average last spring frost in Winterset is around April 28 and the first fall frost is around October 6. That gives Winterset an average growing season of about 161 days.

Last spring frost

Early (10% chance after)April 15
Average (50%)April 28
Late (90%)May 14

First fall frost

Early (10%)September 22
Average (50%)October 6
Late (90% chance before)October 24

See the Winterset planting calendar →