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 |