Frost dates in Grand Forks, ND
The average last spring frost in Grand Forks is around May 15 and the first fall frost is around September 25. That gives Grand Forks an average growing season of about 133 days.
Last spring frost
| Early (10% chance after) | April 27 |
|---|---|
| Average (50%) | May 15 |
| Late (90%) | June 3 |
First fall frost
| Early (10%) | September 10 |
|---|---|
| Average (50%) | September 25 |
| Late (90% chance before) | October 8 |