Duncanville, TX 75237 Frost Dates
75237, near Duncanville, TX: the frost window
Around 03/06 is the usual last spring frost, about 190 days away. Fall's first freeze usually shows up around 11/25, roughly 265 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Duncanville in Zone 8b (15 to 20°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
Duncanville's growing season runs out in roughly 13 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 03/06 isn't a guarantee
03/06 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/15 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/26 and only about 1 year in 10 sees frost after that.
Duncanville against the rest of the dataset
About 265 days separate Duncanville's last and first frost, putting it 5,964 of 40,283 ZIP codes nationally. Within TX, it ranks 1,049 of 2,558.
Learn more
Two guides worth reading on 75237: zone vs. frost date, on why Zone 8b and Duncanville's frost date answer different questions, and the frost range, on how to read the range around Duncanville's dates instead of trusting one.