Frost dates in Superior, WY

The average last spring frost in Superior is around May 28 and the first fall frost is around September 22. That gives Superior an average growing season of about 117 days.

Last spring frost

Early (10% chance after)May 7
Average (50%)May 28
Late (90%)June 13

First fall frost

Early (10%)September 11
Average (50%)September 22
Late (90% chance before)October 9

See the Superior planting calendar →