San Antonio, TX 78211 Frost Dates
When can you plant in San Antonio, TX?
Typically, the last spring freeze lands around 02/22, roughly 178 days out. The first fall frost typically arrives around 12/02, about 284 frost-free days later.
San Antonio sits in USDA Zone 9a (20 to 25°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
About 14 weeks of growing season left in San Antonio before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around San Antonio's last frost
02/22 is the middle of 30 years of NOAA records, not a promise. Plant by 01/16 and you're betting against frost in roughly 9 years out of 10. 03/12 is the safer bet, historically only a 1-in-10 chance of frost that late.
How San Antonio compares
At roughly 284 frost-free days, San Antonio places 4,656 of 40,283 ZIP codes in this dataset. Within TX, it ranks 718 of 2,558.
Learn more
local microclimates covers what one yard in San Antonio can differ from the 78211 normal. zone vs. frost date covers why Zone 9a and San Antonio's frost date answer different questions.