San Marcos, TX Frost Dates
The last spring frost in San Marcos usually comes around March 12 and the first fall frost around November 16.
| Spring (last) | Fall (first) | |
|---|---|---|
| Frost, 32°F | March 12 | November 16 |
| Hard freeze, 28°F | February 27 | December 1 |
Growing season: about 252 days.
Frequently asked questions
When is the last frost in San Marcos, TX?
The median date of the last spring frost (32°F) is March 12. In half of years the last frost comes earlier and in half it comes later, so waiting a week or two past March 12 lowers the risk for tender plants.
When is the first frost in San Marcos?
The median date of the first fall frost (32°F) is November 16, and a hard freeze (28°F) usually follows around December 1.
How long is the growing season in San Marcos?
About 252 days between the median last spring frost and first fall frost.
NOAA NCEI U.S. Climate Normals 1991-2020, station USW00013904. Median (50% probability) dates. Low spots and valleys can frost later in spring and earlier in fall than the station.