Del Rio, TX 78837 Frost Dates
78837, near Del Rio, TX: the frost window
Around 03/10 is the usual last spring frost, about 194 days away. Fall's first freeze usually shows up around 11/18, roughly 251 days after the last spring frost.
Zone 8b (15 to 20°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 Del Rio, not a forecast for this year.
Stretching the season past the first frost
Del Rio's growing season runs out in roughly 12 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 03/10 isn't a guarantee
03/10 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/23 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/29 and only about 1 year in 10 sees frost after that.
Del Rio against the rest of the dataset
About 251 days separate Del Rio's last and first frost, putting it 7,284 of 40,283 ZIP codes nationally. Within TX, it ranks 1,595 of 2,558.
Learn more
Two guides worth reading on 78837: local microclimates, on what one yard in Del Rio can differ from the 78837 normal, and zone vs. frost date, on why Zone 8b and Del Rio's frost date answer different questions.