Frost dates in Riddle, OR

The average last spring frost in Riddle is around April 20 and the first fall frost is around October 25. That gives Riddle an average growing season of about 188 days.

Last spring frost

Early (10% chance after)March 27
Average (50%)April 20
Late (90%)May 13

First fall frost

Early (10%)September 28
Average (50%)October 25
Late (90% chance before)December 1

See the Riddle planting calendar →