Frost dates in Riverside, CA
The average last spring frost in Riverside is around March 4 and the first fall frost is around November 30. That gives Riverside an average growing season of about 271 days.
Last spring frost
| Early (10% chance after) | January 15 |
|---|---|
| Average (50%) | March 4 |
| Late (90%) | April 4 |
First fall frost
| Early (10%) | November 7 |
|---|---|
| Average (50%) | November 30 |
| Late (90% chance before) | December 26 |