Frost dates in Riverdale, ND
The average last spring frost in Riverdale is around May 14 and the first fall frost is around October 1. That gives Riverdale an average growing season of about 140 days.
Last spring frost
| Early (10% chance after) | April 30 |
|---|---|
| Average (50%) | May 14 |
| Late (90%) | May 29 |
First fall frost
| Early (10%) | September 12 |
|---|---|
| Average (50%) | October 1 |
| Late (90% chance before) | October 16 |