Frost dates in Troy, MT
The average last spring frost in Troy is around May 21 and the first fall frost is around September 20. That gives Troy an average growing season of about 122 days.
Last spring frost
| Early (10% chance after) | April 26 |
|---|---|
| Average (50%) | May 21 |
| Late (90%) | June 14 |
First fall frost
| Early (10%) | September 6 |
|---|---|
| Average (50%) | September 20 |
| Late (90% chance before) | October 14 |