Seguin, TX 78156 Frost Dates
Frost dates for Seguin, TX, ZIP 78156
Around 03/01 is the usual last spring frost, about 185 days away. The first fall frost typically arrives around 11/26, about 273 frost-free days later.
The USDA Plant Hardiness Zone Map puts Seguin in Zone 9a (20 to 25°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 9a around Seguin has about 13 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.
Why 03/01 isn't a guarantee
03/01 is the middle of 30 years of NOAA records, not a promise. Plant by 02/03 and you're betting against frost in roughly 9 years out of 10. 03/20 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Seguin compares
Seguin's growing season runs about 273 days, ranking 5,186 of 40,283 US ZIP codes measured here, longest to shortest. Within TX, it ranks 864 of 2,558.
Learn more
the frost range explains how to read the range around Seguin's dates instead of trusting one, and local microclimates explains what one yard in Seguin can differ from the 78156 normal.