Frost dates in Harrisburg, PA

The average last spring frost in Harrisburg is around April 10 and the first fall frost is around October 29. That gives Harrisburg an average growing season of about 202 days.

Last spring frost

Early (10% chance after)April 1
Average (50%)April 10
Late (90%)April 22

First fall frost

Early (10%)October 10
Average (50%)October 29
Late (90% chance before)November 8

See the Harrisburg planting calendar →