Sunset Valley, TX 78745 Frost Dates
78745, near Sunset Valley, TX: the frost window
Around 03/12 is the usual last spring frost, about 196 days away. Fall's first freeze usually shows up around 11/16, roughly 252 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Sunset Valley in Zone 9a (20 to 25°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Sunset Valley's growing season runs out in roughly 11 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 03/12 isn't a guarantee
03/12 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/20 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/02 and only about 1 year in 10 sees frost after that.
Sunset Valley against the rest of the dataset
At roughly 252 frost-free days, Sunset Valley places 7,246 of 40,283 ZIP codes in this dataset. Within TX, it ranks 1,573 of 2,558.
Learn more
Two guides worth reading on 78745: local microclimates, on what one yard in Sunset Valley can differ from the 78745 normal, and zone vs. frost date, on why Zone 9a and Sunset Valley's frost date answer different questions.