Frost dates in San Marcos, TX
The average last spring frost in San Marcos is around March 7 and the first fall frost is around November 25. That gives San Marcos an average growing season of about 263 days.
Last spring frost
| Early (10% chance after) | February 8 |
|---|---|
| Average (50%) | March 7 |
| Late (90%) | March 31 |
First fall frost
| Early (10%) | November 6 |
|---|---|
| Average (50%) | November 25 |
| Late (90% chance before) | December 12 |