Frost dates in Glasgow, MT
The average last spring frost in Glasgow is around May 15 and the first fall frost is around September 23. That gives Glasgow an average growing season of about 131 days.
Last spring frost
| Early (10% chance after) | April 24 |
|---|---|
| Average (50%) | May 15 |
| Late (90%) | June 3 |
First fall frost
| Early (10%) | September 6 |
|---|---|
| Average (50%) | September 23 |
| Late (90% chance before) | October 8 |