Frost dates in Merrimac, WI
The average last spring frost in Merrimac is around May 9 and the first fall frost is around October 10. That gives Merrimac an average growing season of about 154 days.
Last spring frost
| Early (10% chance after) | April 27 |
|---|---|
| Average (50%) | May 9 |
| Late (90%) | May 17 |
First fall frost
| Early (10%) | October 1 |
|---|---|
| Average (50%) | October 10 |
| Late (90% chance before) | October 25 |