Frost dates in Denver, CO
The average last spring frost in Denver is around May 3 and the first fall frost is around October 9. That gives Denver an average growing season of about 159 days.
Last spring frost
| Early (10% chance after) | April 18 |
|---|---|
| Average (50%) | May 3 |
| Late (90%) | May 19 |
First fall frost
| Early (10%) | September 20 |
|---|---|
| Average (50%) | October 9 |
| Late (90% chance before) | October 22 |