Frost dates in Winthrop, MN
The average last spring frost in Winthrop is around April 28 and the first fall frost is around October 6. That gives Winthrop an average growing season of about 161 days.
Last spring frost
| Early (10% chance after) | April 14 |
|---|---|
| Average (50%) | April 28 |
| Late (90%) | May 12 |
First fall frost
| Early (10%) | September 23 |
|---|---|
| Average (50%) | October 6 |
| Late (90% chance before) | October 20 |