Frost dates in Blackduck, MN

The average last spring frost in Blackduck is around May 20 and the first fall frost is around September 21. That gives Blackduck an average growing season of about 124 days.

Last spring frost

Early (10% chance after)May 10
Average (50%)May 20
Late (90%)June 2

First fall frost

Early (10%)September 3
Average (50%)September 21
Late (90% chance before)October 9

See the Blackduck planting calendar →