Spring Branch, TX 78133 Frost Dates
Frost dates for Spring Branch, TX, ZIP 78133
Around 03/01 is the usual last spring frost, about 185 days away. The first fall frost typically arrives around 12/01, about 276 frost-free days later.
Spring Branch 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 Spring Branch has about 14 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 03/01 isn't a guarantee
03/01 is the middle of 30 years of NOAA records, not a promise. Plant by 01/31 and you're betting against frost in roughly 9 years out of 10. 03/22 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Spring Branch compares
About 276 days separate Spring Branch's last and first frost, putting it 5,119 of 40,283 ZIP codes nationally. Within TX, it ranks 845 of 2,558.
Learn more
local microclimates explains what one yard in Spring Branch can differ from the 78133 normal, and zone vs. frost date explains why Zone 9a and Spring Branch's frost date answer different questions.