Frost dates in Troy, MT

The average last spring frost in Troy is around May 21 and the first fall frost is around September 20. That gives Troy an average growing season of about 122 days.

Last spring frost

Early (10% chance after)April 26
Average (50%)May 21
Late (90%)June 14

First fall frost

Early (10%)September 6
Average (50%)September 20
Late (90% chance before)October 14

See the Troy planting calendar →