Frost dates in Jamestown, ND
The average last spring frost in Jamestown is around May 15 and the first fall frost is around September 23. That gives Jamestown an average growing season of about 131 days.
Last spring frost
| Early (10% chance after) | April 27 |
|---|---|
| Average (50%) | May 15 |
| Late (90%) | May 29 |
First fall frost
| Early (10%) | September 8 |
|---|---|
| Average (50%) | September 23 |
| Late (90% chance before) | October 10 |