Frost dates in Princeton, IA
The average last spring frost in Princeton is around April 14 and the first fall frost is around October 24. That gives Princeton an average growing season of about 193 days.
Last spring frost
| Early (10% chance after) | April 1 |
|---|---|
| Average (50%) | April 14 |
| Late (90%) | April 28 |
First fall frost
| Early (10%) | October 7 |
|---|---|
| Average (50%) | October 24 |
| Late (90% chance before) | November 6 |