Frost dates in Mount Shasta, CA
The average last spring frost in Mount Shasta is around May 20 and the first fall frost is around October 2. That gives Mount Shasta an average growing season of about 135 days.
Last spring frost
| Early (10% chance after) | May 1 |
|---|---|
| Average (50%) | May 20 |
| Late (90%) | June 12 |
First fall frost
| Early (10%) | September 13 |
|---|---|
| Average (50%) | October 2 |
| Late (90% chance before) | October 18 |