Frost dates in Osseo, WI
The average last spring frost in Osseo is around May 13 and the first fall frost is around October 3. That gives Osseo an average growing season of about 143 days.
Last spring frost
| Early (10% chance after) | April 27 |
|---|---|
| Average (50%) | May 13 |
| Late (90%) | May 21 |
First fall frost
| Early (10%) | September 16 |
|---|---|
| Average (50%) | October 3 |
| Late (90% chance before) | October 16 |