Frost dates in Prairie City, IL
The average last spring frost in Prairie City is around April 20 and the first fall frost is around October 20. That gives Prairie City an average growing season of about 183 days.
Last spring frost
| Early (10% chance after) | March 31 |
|---|---|
| Average (50%) | April 20 |
| Late (90%) | May 5 |
First fall frost
| Early (10%) | October 8 |
|---|---|
| Average (50%) | October 20 |
| Late (90% chance before) | November 1 |