Round Mountain, TX 78663 Frost Dates
Frost dates for Round Mountain, TX, ZIP 78663
Around 03/02 is the usual last spring frost, about 186 days away. The first fall frost typically arrives around 11/29, about 274 frost-free days later.
Zone 8b (15 to 20°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Round Mountain, not a forecast for this year.
What to do before the first frost
Zone 8b around Round Mountain 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 03/02 isn't a guarantee
03/02 is the middle of 30 years of NOAA records, not a promise. Plant by 02/06 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 Round Mountain compares
Round Mountain's growing season runs about 274 days, ranking 5,176 of 40,283 US ZIP codes measured here, longest to shortest. Within TX, it ranks 858 of 2,558.
Learn more
the frost range explains how to read the range around Round Mountain's dates instead of trusting one, and local microclimates explains what one yard in Round Mountain can differ from the 78663 normal.