Sour Lake, TX 77659 Frost Dates
77659, near Sour Lake, TX: the frost window
Around 02/18 is the usual last spring frost, about 174 days away. Fall's first freeze usually shows up around 12/02, roughly 291 days after the last spring frost.
Sour Lake sits in USDA Zone 9a (20 to 25°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
Sour Lake'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.
The actual range around Sour Lake's last frost
02/18 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/20 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/15 and only about 1 year in 10 sees frost after that.
Sour Lake against the rest of the dataset
Sour Lake's growing season runs about 291 days, ranking 4,456 of 40,283 US ZIP codes measured here, longest to shortest. Within TX, it ranks 609 of 2,558.
Learn more
Two guides worth reading on 77659: zone vs. frost date, on why Zone 9a and Sour Lake's frost date answer different questions, and the frost range, on how to read the range around Sour Lake's dates instead of trusting one.