Somerville, TX 77879 Frost Dates
Frost dates for Somerville, TX, ZIP 77879
Typically, the last spring freeze lands around 03/18, roughly 202 days out. The first fall frost typically arrives around 11/09, about 238 frost-free days later.
Somerville sits in USDA Zone 9a (20 to 25°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 9a around Somerville 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.
How much risk comes with planting early here
03/18 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. 04/06 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Somerville compares
About 238 days separate Somerville's last and first frost, putting it 8,992 of 40,283 ZIP codes nationally. Within TX, it ranks 1,986 of 2,558.
Learn more
local microclimates explains what one yard in Somerville can differ from the 77879 normal, and zone vs. frost date explains why Zone 9a and Somerville's frost date answer different questions.