San Antonio, TX 78205 Frost Dates
San Antonio, TX: when does the frost end?
The last spring frost here typically falls around 02/25, about 181 days from today. Fall's first freeze usually shows up around 11/28, roughly 277 days after the last spring frost.
Zone 9a (20 to 25°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for San Antonio, not a forecast for this year.
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.
The actual range around San Antonio's last frost
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
At roughly 277 frost-free days, San Antonio places 4,938 of 40,283 ZIP codes in this dataset. Within TX, it ranks 771 of 2,558.
Learn more
Before leaning on 78205's figures: the frost range explains how to read the range around San Antonio's dates instead of trusting one, while local microclimates explains what one yard in San Antonio can differ from the 78205 normal.