Frost dates in Sibley, IA
The average last spring frost in Sibley is around May 10 and the first fall frost is around September 27. That gives Sibley an average growing season of about 140 days.
Last spring frost
| Early (10% chance after) | April 23 |
|---|---|
| Average (50%) | May 10 |
| Late (90%) | May 27 |
First fall frost
| Early (10%) | September 14 |
|---|---|
| Average (50%) | September 27 |
| Late (90% chance before) | October 12 |