Frost dates in Flensburg, MN

The average last spring frost in Flensburg is around May 12 and the first fall frost is around September 25. That gives Flensburg an average growing season of about 136 days.

Last spring frost

Early (10% chance after)April 26
Average (50%)May 12
Late (90%)May 25

First fall frost

Early (10%)September 16
Average (50%)September 25
Late (90% chance before)October 11

See the Flensburg planting calendar →