Frost dates in Sinai, SD

The average last spring frost in Sinai is around May 4 and the first fall frost is around September 28. That gives Sinai an average growing season of about 147 days.

Last spring frost

Early (10% chance after)April 21
Average (50%)May 4
Late (90%)May 20

First fall frost

Early (10%)September 22
Average (50%)September 28
Late (90% chance before)October 15

See the Sinai planting calendar →