Frost dates in Northboro, IA
The average last spring frost in Northboro is around April 26 and the first fall frost is around October 10. That gives Northboro an average growing season of about 167 days.
Last spring frost
| Early (10% chance after) | April 11 |
|---|---|
| Average (50%) | April 26 |
| Late (90%) | May 10 |
First fall frost
| Early (10%) | September 27 |
|---|---|
| Average (50%) | October 10 |
| Late (90% chance before) | October 27 |