San Antonio, FL 33576 Frost Dates
33576, near San Antonio, FL: the frost window
Typically, the last spring freeze lands around 01/31, roughly 156 days out. Fall's first freeze usually shows up around 01/08, roughly 336 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts San Antonio in Zone 9b (25 to 30°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
San Antonio's growing season runs out in roughly 19 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
01/31 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/03 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 02/28 and only about 1 year in 10 sees frost after that.
San Antonio against the rest of the dataset
At roughly 336 frost-free days, San Antonio places 2,733 of 40,283 ZIP codes in this dataset. Within FL, it ranks 1,100 of 1,609.
Learn more
Two guides worth reading on 33576: zone vs. frost date, on why Zone 9b and San Antonio's frost date answer different questions, and the frost range, on how to read the range around San Antonio's dates instead of trusting one.