Frost dates in Blairstown, IA
The average last spring frost in Blairstown is around April 30 and the first fall frost is around October 5. That gives Blairstown an average growing season of about 158 days.
Last spring frost
| Early (10% chance after) | April 17 |
|---|---|
| Average (50%) | April 30 |
| Late (90%) | May 17 |
First fall frost
| Early (10%) | September 21 |
|---|---|
| Average (50%) | October 5 |
| Late (90% chance before) | October 20 |