Sweeny, TX 77415 Frost Dates
77415, near Sweeny, TX: the frost window
The last spring frost here typically falls around 02/20, about 176 days from today. Fall's first freeze usually shows up around 12/03, roughly 290 days after the last spring frost.
Sweeny sits in USDA Zone 9b (25 to 30°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
Sweeny'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.
Why 02/20 isn't a guarantee
02/20 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/19 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.
Sweeny against the rest of the dataset
At roughly 290 frost-free days, Sweeny places 4,523 of 40,283 ZIP codes in this dataset. Within TX, it ranks 657 of 2,558.
Learn more
Two guides worth reading on 77415: local microclimates, on what one yard in Sweeny can differ from the 77415 normal, and zone vs. frost date, on why Zone 9b and Sweeny's frost date answer different questions.