Frost dates in New Castle, CO
The average last spring frost in New Castle is around May 17 and the first fall frost is around September 27. That gives New Castle an average growing season of about 133 days.
Last spring frost
| Early (10% chance after) | April 30 |
|---|---|
| Average (50%) | May 17 |
| Late (90%) | June 13 |
First fall frost
| Early (10%) | September 12 |
|---|---|
| Average (50%) | September 27 |
| Late (90% chance before) | October 16 |