Crystal City, TX 78839 Frost Dates
78839, near Crystal City, TX: the frost window
Around 02/11 is the usual last spring frost, about 167 days away. Fall's first freeze usually shows up around 12/03, roughly 300 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Crystal City 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
Crystal City's growing season runs out in roughly 14 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
02/11 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/05 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/09 and only about 1 year in 10 sees frost after that.
Crystal City against the rest of the dataset
Crystal City's growing season runs about 300 days, ranking 4,111 of 40,283 US ZIP codes measured here, longest to shortest. Within TX, it ranks 441 of 2,558.
Learn more
Two guides worth reading on 78839: the frost range, on how to read the range around Crystal City's dates instead of trusting one, and local microclimates, on what one yard in Crystal City can differ from the 78839 normal.