Frost dates in Worthington, IA
The average last spring frost in Worthington is around April 30 and the first fall frost is around October 4. That gives Worthington an average growing season of about 157 days.
Last spring frost
| Early (10% chance after) | April 19 |
|---|---|
| Average (50%) | April 30 |
| Late (90%) | May 17 |
First fall frost
| Early (10%) | September 20 |
|---|---|
| Average (50%) | October 4 |
| Late (90% chance before) | October 14 |