Frost dates in Mason, WI
The average last spring frost in Mason is around May 28 and the first fall frost is around September 29. That gives Mason an average growing season of about 124 days.
Last spring frost
| Early (10% chance after) | May 13 |
|---|---|
| Average (50%) | May 28 |
| Late (90%) | June 11 |
First fall frost
| Early (10%) | September 14 |
|---|---|
| Average (50%) | September 29 |
| Late (90% chance before) | October 10 |