Frost dates in Diamond Bar, CA
The average last spring frost in Diamond Bar is around March 12 and the first fall frost is around November 26. That gives Diamond Bar an average growing season of about 259 days.
Last spring frost
| Early (10% chance after) | January 25 |
|---|---|
| Average (50%) | March 12 |
| Late (90%) | April 14 |
First fall frost
| Early (10%) | November 6 |
|---|---|
| Average (50%) | November 26 |
| Late (90% chance before) | December 25 |