Frost dates in Keystone, WV
The average last spring frost in Keystone is around April 24 and the first fall frost is around October 15. That gives Keystone an average growing season of about 174 days.
Last spring frost
| Early (10% chance after) | April 10 |
|---|---|
| Average (50%) | April 24 |
| Late (90%) | May 15 |
First fall frost
| Early (10%) | October 2 |
|---|---|
| Average (50%) | October 15 |
| Late (90% chance before) | October 29 |