Austin, TX 78799 Frost Dates
Frost dates for Austin, TX, ZIP 78799
Around 02/20 is the usual last spring frost, about 176 days away. The first fall frost typically arrives around 12/03, about 291 frost-free days later.
Austin 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
Zone 9a around Austin has about 14 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
The actual range around Austin's last frost
02/20 is the middle of 30 years of NOAA records, not a promise. Plant by 01/23 and you're betting against frost in roughly 9 years out of 10. 03/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Austin compares
At roughly 291 frost-free days, Austin places 4,425 of 40,283 ZIP codes in this dataset. Within TX, it ranks 587 of 2,558.
Learn more
the frost range explains how to read the range around Austin's dates instead of trusting one, and local microclimates explains what one yard in Austin can differ from the 78799 normal.