Blackwell, TX 79566 Frost Dates
Frost dates for Blackwell, TX, ZIP 79566
Typically, the last spring freeze lands around 04/03, roughly 218 days out. The first fall frost typically arrives around 11/04, about 217 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 04/03 isn't a guarantee
04/03 is the middle of 30 years of NOAA records, not a promise. Plant by 03/14 and you're betting against frost in roughly 9 years out of 10. 04/20 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Blackwell compares
At roughly 217 frost-free days, Blackwell places 13,616 of 40,283 ZIP codes in this dataset. Within TX, it ranks 2,333 of 2,558.
Learn more
the frost range explains how to read the range around Blackwell's dates instead of trusting one, and local microclimates explains what one yard in Blackwell can differ from the 79566 normal.