Frost dates in Bertram, IA

The average last spring frost in Bertram is around April 26 and the first fall frost is around October 9. That gives Bertram an average growing season of about 166 days.

Last spring frost

Early (10% chance after)April 13
Average (50%)April 26
Late (90%)May 14

First fall frost

Early (10%)September 26
Average (50%)October 9
Late (90% chance before)October 23

See the Bertram planting calendar →