Frost dates in Riverdale, ND

The average last spring frost in Riverdale is around May 14 and the first fall frost is around October 1. That gives Riverdale an average growing season of about 140 days.

Last spring frost

Early (10% chance after)April 30
Average (50%)May 14
Late (90%)May 29

First fall frost

Early (10%)September 12
Average (50%)October 1
Late (90% chance before)October 16

See the Riverdale planting calendar →