San Antonio, TX 78201 Frost Dates
San Antonio, TX: when does the frost end?
Around 02/25 is the usual last spring frost, about 181 days away. Fall's first freeze usually shows up around 11/28, roughly 277 days after the last spring frost.
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.
Stretching the season past the first frost
With roughly 13 weeks until San Antonio's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
02/25 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/28 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/19 and only about 1 year in 10 sees frost after that.
San Antonio against the rest of the dataset
San Antonio's growing season runs about 277 days, ranking 4,937 of 40,283 US ZIP codes measured here, longest to shortest. Within TX, it ranks 770 of 2,558.
Learn more
Before leaning on 78201's figures: local microclimates explains what one yard in San Antonio can differ from the 78201 normal, while zone vs. frost date explains why Zone 9a and San Antonio's frost date answer different questions.