Frost dates in Hillsboro, ND
The average last spring frost in Hillsboro is around May 12 and the first fall frost is around September 26. That gives Hillsboro an average growing season of about 137 days.
Last spring frost
| Early (10% chance after) | April 24 |
|---|---|
| Average (50%) | May 12 |
| Late (90%) | May 24 |
First fall frost
| Early (10%) | September 14 |
|---|---|
| Average (50%) | September 26 |
| Late (90% chance before) | October 11 |