Mathis, TX 78391 Frost Dates
Frost dates for Mathis, TX, ZIP 78391
Around 02/01 is the usual last spring frost, about 157 days away. The first fall frost typically arrives around 12/17, about 324 frost-free days later.
Zone 9b (25 to 30°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 Mathis, not a forecast for this year.
What to do before the first frost
Zone 9b around Mathis has about 16 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.
How much risk comes with planting early here
02/01 is the middle of 30 years of NOAA records, not a promise. Plant by 03/06 and you're betting against frost in roughly 9 years out of 10. 12/27 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Mathis compares
About 324 days separate Mathis's last and first frost, putting it 3,230 of 40,283 ZIP codes nationally. Within TX, it ranks 197 of 2,558.
Learn more
the frost range explains how to read the range around Mathis's dates instead of trusting one, and local microclimates explains what one yard in Mathis can differ from the 78391 normal.