Frost dates in Napa, CA
The average last spring frost in Napa is around March 7 and the first fall frost is around November 28. That gives Napa an average growing season of about 266 days.
Last spring frost
| Early (10% chance after) | January 20 |
|---|---|
| Average (50%) | March 7 |
| Late (90%) | April 21 |
First fall frost
| Early (10%) | November 4 |
|---|---|
| Average (50%) | November 28 |
| Late (90% chance before) | December 21 |