Frost dates in Newcastle, WY
The average last spring frost in Newcastle is around May 14 and the first fall frost is around September 27. That gives Newcastle an average growing season of about 136 days.
Last spring frost
| Early (10% chance after) | May 1 |
|---|---|
| Average (50%) | May 14 |
| Late (90%) | May 29 |
First fall frost
| Early (10%) | September 13 |
|---|---|
| Average (50%) | September 27 |
| Late (90% chance before) | October 13 |