Mount Vernon, TX 75457 Frost Dates
Frost dates for Mount Vernon, TX, ZIP 75457
The last spring frost here typically falls around 03/15, about 199 days from today. The first fall frost typically arrives around 11/14, about 245 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 Mount Vernon, not a forecast for this year.
What to do before the first frost
Zone 8b around Mount Vernon has about 11 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
03/15 is the middle of 30 years of NOAA records, not a promise. Plant by 02/25 and you're betting against frost in roughly 9 years out of 10. 04/04 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Mount Vernon compares
Mount Vernon's growing season runs about 245 days, ranking 8,027 of 40,283 US ZIP codes measured here, longest to shortest. Within TX, it ranks 1,811 of 2,558.
Learn more
zone vs. frost date explains why Zone 8b and Mount Vernon's frost date answer different questions, and the frost range explains how to read the range around Mount Vernon's dates instead of trusting one.