Frost dates in St. Clair, MO

The average last spring frost in St. Clair is around April 20 and the first fall frost is around October 11. That gives St. Clair an average growing season of about 174 days.

Last spring frost

Early (10% chance after)April 7
Average (50%)April 20
Late (90%)May 7

First fall frost

Early (10%)September 30
Average (50%)October 11
Late (90% chance before)October 29

See the St. Clair planting calendar →