Frost dates in Mount Zion, IL
The average last spring frost in Mount Zion is around April 20 and the first fall frost is around October 17. That gives Mount Zion an average growing season of about 180 days.
Last spring frost
| Early (10% chance after) | April 10 |
|---|---|
| Average (50%) | April 20 |
| Late (90%) | May 16 |
First fall frost
| Early (10%) | September 29 |
|---|---|
| Average (50%) | October 17 |
| Late (90% chance before) | November 2 |