Frost dates in Altoona, WI
The average last spring frost in Altoona is around April 28 and the first fall frost is around October 17. That gives Altoona an average growing season of about 172 days.
Last spring frost
| Early (10% chance after) | April 21 |
|---|---|
| Average (50%) | April 28 |
| Late (90%) | May 13 |
First fall frost
| Early (10%) | September 30 |
|---|---|
| Average (50%) | October 17 |
| Late (90% chance before) | October 26 |