Frost dates in Romeoville, IL

The average last spring frost in Romeoville is around April 21 and the first fall frost is around October 19. That gives Romeoville an average growing season of about 181 days.

Last spring frost

Early (10% chance after)April 9
Average (50%)April 21
Late (90%)May 3

First fall frost

Early (10%)October 6
Average (50%)October 19
Late (90% chance before)November 2

See the Romeoville planting calendar →