Frost dates in Plentywood, MT
The average last spring frost in Plentywood is around May 18 and the first fall frost is around September 17. That gives Plentywood an average growing season of about 122 days.
Last spring frost
| Early (10% chance after) | May 6 |
|---|---|
| Average (50%) | May 18 |
| Late (90%) | June 4 |
First fall frost
| Early (10%) | September 5 |
|---|---|
| Average (50%) | September 17 |
| Late (90% chance before) | September 24 |