Frost dates in Raritan, IL
The average last spring frost in Raritan is around April 23 and the first fall frost is around October 12. That gives Raritan an average growing season of about 172 days.
Last spring frost
| Early (10% chance after) | April 10 |
|---|---|
| Average (50%) | April 23 |
| Late (90%) | May 9 |
First fall frost
| Early (10%) | September 27 |
|---|---|
| Average (50%) | October 12 |
| Late (90% chance before) | October 28 |