Frost dates in Fort Collins, CO
The average last spring frost in Fort Collins is around May 7 and the first fall frost is around October 1. That gives Fort Collins an average growing season of about 147 days.
Last spring frost
| Early (10% chance after) | April 23 |
|---|---|
| Average (50%) | May 7 |
| Late (90%) | May 22 |
First fall frost
| Early (10%) | September 14 |
|---|---|
| Average (50%) | October 1 |
| Late (90% chance before) | October 17 |