Frost dates in Middle River, MN
The average last spring frost in Middle River is around May 12 and the first fall frost is around September 22. That gives Middle River an average growing season of about 133 days.
Last spring frost
| Early (10% chance after) | April 22 |
|---|---|
| Average (50%) | May 12 |
| Late (90%) | May 26 |
First fall frost
| Early (10%) | September 9 |
|---|---|
| Average (50%) | September 22 |
| Late (90% chance before) | October 17 |