Frost dates in Calhan, CO
The average last spring frost in Calhan is around May 16 and the first fall frost is around September 28. That gives Calhan an average growing season of about 135 days.
Last spring frost
| Early (10% chance after) | May 2 |
|---|---|
| Average (50%) | May 16 |
| Late (90%) | May 31 |
First fall frost
| Early (10%) | September 15 |
|---|---|
| Average (50%) | September 28 |
| Late (90% chance before) | October 10 |