Blackwell, TX 79535 Frost Dates
Frost dates for Blackwell, TX, ZIP 79535
Typically, the last spring freeze lands around 03/30, roughly 214 days out. The first fall frost typically arrives around 11/08, about 223 frost-free days later.
The USDA Plant Hardiness Zone Map puts Blackwell in Zone 8a (10 to 15°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 8a around Blackwell has about 10 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 03/30 isn't a guarantee
03/30 is the middle of 30 years of NOAA records, not a promise. Plant by 03/08 and you're betting against frost in roughly 9 years out of 10. 04/17 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Blackwell compares
About 223 days separate Blackwell's last and first frost, putting it 12,153 of 40,283 ZIP codes nationally. Within TX, it ranks 2,271 of 2,558.
Learn more
zone vs. frost date explains why Zone 8a and Blackwell's frost date answer different questions, and the frost range explains how to read the range around Blackwell's dates instead of trusting one.