Big Spring, TX 79720 Frost Dates
79720, near Big Spring, TX: the frost window
Around 03/20 is the usual last spring frost, about 204 days away. Fall's first freeze usually shows up around 11/13, roughly 239 days after the last spring frost.
Zone 8a (10 to 15°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 Big Spring, not a forecast for this year.
Stretching the season past the first frost
Big Spring'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.
The actual range around Big Spring's last frost
03/20 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/01 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/07 and only about 1 year in 10 sees frost after that.
Big Spring against the rest of the dataset
Big Spring's growing season runs about 239 days, ranking 8,790 of 40,283 US ZIP codes measured here, longest to shortest. Within TX, it ranks 1,950 of 2,558.
Learn more
Two guides worth reading on 79720: local microclimates, on what one yard in Big Spring can differ from the 79720 normal, and zone vs. frost date, on why Zone 8a and Big Spring's frost date answer different questions.