Frost dates in New Plymouth, ID

The average last spring frost in New Plymouth is around May 5 and the first fall frost is around September 29. That gives New Plymouth an average growing season of about 147 days.

Last spring frost

Early (10% chance after)April 16
Average (50%)May 5
Late (90%)May 25

First fall frost

Early (10%)September 16
Average (50%)September 29
Late (90% chance before)October 14

See the New Plymouth planting calendar →