San Antonio, FL 33574 Frost Dates
San Antonio, FL: when does the frost end?
Around 01/31 is the usual last spring frost, about 156 days away. Fall's first freeze usually shows up around 01/08, roughly 336 days after the last spring frost.
Zone 9b (25 to 30°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for San Antonio, not a forecast for this year.
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.
The actual range around San Antonio's last frost
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 2,732 of 40,283 ZIP codes in this dataset. Within FL, it ranks 1,099 of 1,609.
Learn more
Before leaning on 33574's figures: local microclimates explains what one yard in San Antonio can differ from the 33574 normal, while zone vs. frost date explains why Zone 9b and San Antonio's frost date answer different questions.