Frost dates in Duncan, OK

The average last spring frost in Duncan is around March 27 and the first fall frost is around November 8. That gives Duncan an average growing season of about 226 days.

Last spring frost

Early (10% chance after)March 7
Average (50%)March 27
Late (90%)April 12

First fall frost

Early (10%)October 26
Average (50%)November 8
Late (90% chance before)November 22

See the Duncan planting calendar →