Frost dates in Aspen, CO
The average last spring frost in Aspen is around June 5 and the first fall frost is around September 19. That gives Aspen an average growing season of about 106 days.
Last spring frost
| Early (10% chance after) | May 18 |
|---|---|
| Average (50%) | June 5 |
| Late (90%) | June 21 |
First fall frost
| Early (10%) | September 8 |
|---|---|
| Average (50%) | September 19 |
| Late (90% chance before) | October 9 |