Austin, TX 78758 Frost Dates
78758, near Austin, TX: the frost window
Around 03/11 is the usual last spring frost, about 195 days away. Fall's first freeze usually shows up around 11/20, roughly 254 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Austin in Zone 9a (20 to 25°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Austin's growing season runs out in roughly 12 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Austin's last frost
03/11 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/22 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/29 and only about 1 year in 10 sees frost after that.
Austin against the rest of the dataset
At roughly 254 frost-free days, Austin places 6,981 of 40,283 ZIP codes in this dataset. Within TX, it ranks 1,510 of 2,558.
Learn more
Two guides worth reading on 78758: the frost range, on how to read the range around Austin's dates instead of trusting one, and local microclimates, on what one yard in Austin can differ from the 78758 normal.