Frost dates in Alturas, CA
The average last spring frost in Alturas is around June 18 and the first fall frost is around September 1. That gives Alturas an average growing season of about 75 days.
Last spring frost
| Early (10% chance after) | May 25 |
|---|---|
| Average (50%) | June 18 |
| Late (90%) | July 12 |
First fall frost
| Early (10%) | August 15 |
|---|---|
| Average (50%) | September 1 |
| Late (90% chance before) | September 21 |