Frost dates in Grand Marais, MN
The average last spring frost in Grand Marais is around May 16 and the first fall frost is around October 3. That gives Grand Marais an average growing season of about 140 days.
Last spring frost
| Early (10% chance after) | May 1 |
|---|---|
| Average (50%) | May 16 |
| Late (90%) | June 1 |
First fall frost
| Early (10%) | September 21 |
|---|---|
| Average (50%) | October 3 |
| Late (90% chance before) | October 19 |