Frost dates in Manhattan, MT
The average last spring frost in Manhattan is around May 23 and the first fall frost is around September 13. That gives Manhattan an average growing season of about 113 days.
Last spring frost
| Early (10% chance after) | May 10 |
|---|---|
| Average (50%) | May 23 |
| Late (90%) | June 15 |
First fall frost
| Early (10%) | September 4 |
|---|---|
| Average (50%) | September 13 |
| Late (90% chance before) | September 28 |