Santa Rosa, TX 78593 Frost Dates
78593, near Santa Rosa, TX: the frost window
Typically, the last spring freeze lands around 01/10, roughly 135 days out. Fall's first freeze usually shows up around 12/27, roughly 355 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Santa Rosa in Zone 10a (30 to 35°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
Santa Rosa's growing season runs out in roughly 17 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 01/10 isn't a guarantee
01/10 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/24 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/13 and only about 1 year in 10 sees frost after that.
Santa Rosa against the rest of the dataset
At roughly 355 frost-free days, Santa Rosa places 2,148 of 40,283 ZIP codes in this dataset. Within TX, it ranks 66 of 2,558.
Learn more
Two guides worth reading on 78593: local microclimates, on what one yard in Santa Rosa can differ from the 78593 normal, and zone vs. frost date, on why Zone 10a and Santa Rosa's frost date answer different questions.