Frost dates in Jamestown, CO

The average last spring frost in Jamestown is around June 25 and the first fall frost is around August 20. That gives Jamestown an average growing season of about 56 days.

Last spring frost

Early (10% chance after)June 11
Average (50%)June 25
Late (90%)July 27

First fall frost

Early (10%)August 4
Average (50%)August 20
Late (90% chance before)September 14

See the Jamestown planting calendar →