Frost dates in Grass Valley, CA
The average last spring frost in Grass Valley is around April 18 and the first fall frost is around November 6. That gives Grass Valley an average growing season of about 202 days.
Last spring frost
| Early (10% chance after) | March 29 |
|---|---|
| Average (50%) | April 18 |
| Late (90%) | May 9 |
First fall frost
| Early (10%) | October 17 |
|---|---|
| Average (50%) | November 6 |
| Late (90% chance before) | November 26 |