Frost dates in Sibley, ND
The average last spring frost in Sibley is around May 18 and the first fall frost is around September 20. That gives Sibley an average growing season of about 125 days.
Last spring frost
| Early (10% chance after) | May 7 |
|---|---|
| Average (50%) | May 18 |
| Late (90%) | June 3 |
First fall frost
| Early (10%) | September 9 |
|---|---|
| Average (50%) | September 20 |
| Late (90% chance before) | October 2 |