Sinton, TX 78387 Frost Dates
Frost dates for Sinton, TX, ZIP 78387
Typically, the last spring freeze lands around 02/01, roughly 157 days out. The first fall frost typically arrives around 12/17, about 324 frost-free days later.
Sinton sits in USDA Zone 9b (25 to 30°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 9b around Sinton 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 Sinton compares
Sinton's growing season runs about 324 days, ranking 3,228 of 40,283 US ZIP codes measured here, longest to shortest. Within TX, it ranks 195 of 2,558.
Learn more
local microclimates explains what one yard in Sinton can differ from the 78387 normal, and zone vs. frost date explains why Zone 9b and Sinton's frost date answer different questions.