Frost dates in West Union, IA

The average last spring frost in West Union is around May 10 and the first fall frost is around September 29. That gives West Union an average growing season of about 142 days.

Last spring frost

Early (10% chance after)April 22
Average (50%)May 10
Late (90%)May 27

First fall frost

Early (10%)September 17
Average (50%)September 29
Late (90% chance before)October 15

See the West Union planting calendar →