Frost dates in Piedmont, CA
The average last spring frost in Piedmont is around January 30 and the first fall frost is around December 21. That gives Piedmont an average growing season of about 326 days.
Last spring frost
| Early (10% chance after) | January 13 |
|---|---|
| Average (50%) | January 30 |
| Late (90%) | February 4 |
First fall frost
| Early (10%) | December 14 |
|---|---|
| Average (50%) | December 21 |
| Late (90% chance before) | December 28 |