Frost dates in Newcastle, WY

The average last spring frost in Newcastle is around May 14 and the first fall frost is around September 27. That gives Newcastle an average growing season of about 136 days.

Last spring frost

Early (10% chance after)May 1
Average (50%)May 14
Late (90%)May 29

First fall frost

Early (10%)September 13
Average (50%)September 27
Late (90% chance before)October 13

See the Newcastle planting calendar →