San Antonio, FL 33545 Frost Dates
San Antonio, FL: when does the frost end?
The last spring frost here typically falls around 01/31, about 156 days from today. 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
With roughly 19 weeks until San Antonio's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
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 2,731 of 40,283 ZIP codes in this dataset. Within FL, it ranks 1,098 of 1,609.
Learn more
Before leaning on 33545's figures: zone vs. frost date explains why Zone 9b and San Antonio's frost date answer different questions, while the frost range explains how to read the range around San Antonio's dates instead of trusting one.