Frost dates in Hartford, WI
The average last spring frost in Hartford is around May 10 and the first fall frost is around October 3. That gives Hartford an average growing season of about 146 days.
Last spring frost
| Early (10% chance after) | April 22 |
|---|---|
| Average (50%) | May 10 |
| Late (90%) | May 27 |
First fall frost
| Early (10%) | September 18 |
|---|---|
| Average (50%) | October 3 |
| Late (90% chance before) | October 17 |