Marfa, TX 79843 Frost Dates
Frost dates for Marfa, TX, ZIP 79843
Around 04/14 is the usual last spring frost, about 229 days away. The first fall frost typically arrives around 10/27, about 196 frost-free days later.
Marfa sits in USDA Zone 8a (10 to 15°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 8a around Marfa has about 9 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 04/14 isn't a guarantee
04/14 is the middle of 30 years of NOAA records, not a promise. Plant by 03/30 and you're betting against frost in roughly 9 years out of 10. 05/01 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Marfa compares
About 196 days separate Marfa's last and first frost, putting it 19,008 of 40,283 ZIP codes nationally. Within TX, it ranks 2,458 of 2,558.
Learn more
the frost range explains how to read the range around Marfa's dates instead of trusting one, and local microclimates explains what one yard in Marfa can differ from the 79843 normal.