Frost dates in Dorchester, IL

The average last spring frost in Dorchester is around March 25 and the first fall frost is around November 3. That gives Dorchester an average growing season of about 223 days.

Last spring frost

Early (10% chance after)March 9
Average (50%)March 25
Late (90%)April 5

First fall frost

Early (10%)October 6
Average (50%)November 3
Late (90% chance before)November 27

See the Dorchester planting calendar →