San Antonio, FL 34673 Frost Dates
Frost dates for San Antonio, FL, ZIP 34673
Around 03/01 is the usual last spring frost, about 185 days away. The first fall frost typically arrives around 12/05, about 281 frost-free days later.
Zone 10a (30 to 35°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.
What to do before the first frost
Zone 10a around San Antonio has about 14 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 03/01 isn't a guarantee
03/01 is the middle of 30 years of NOAA records, not a promise. Plant by 01/30 and you're betting against frost in roughly 9 years out of 10. 03/27 is the safer bet, historically only a 1-in-10 chance of frost that late.
How San Antonio compares
About 281 days separate San Antonio's last and first frost, putting it 4,811 of 40,283 ZIP codes nationally. Within FL, it ranks 1,417 of 1,609.
Learn more
local microclimates explains what one yard in San Antonio can differ from the 34673 normal, and zone vs. frost date explains why Zone 10a and San Antonio's frost date answer different questions.