Frost dates in Riverton, MN

The average last spring frost in Riverton is around May 12 and the first fall frost is around September 29. That gives Riverton an average growing season of about 140 days.

Last spring frost

Early (10% chance after)April 24
Average (50%)May 12
Late (90%)May 22

First fall frost

Early (10%)September 12
Average (50%)September 29
Late (90% chance before)October 11

See the Riverton planting calendar →