Frost dates in Sibley, IA

The average last spring frost in Sibley is around May 10 and the first fall frost is around September 27. That gives Sibley an average growing season of about 140 days.

Last spring frost

Early (10% chance after)April 23
Average (50%)May 10
Late (90%)May 27

First fall frost

Early (10%)September 14
Average (50%)September 27
Late (90% chance before)October 12

See the Sibley planting calendar →