Jacksonville, FL 32221 Frost Dates
32221, near Jacksonville, FL: the frost window
Around 02/28 is the usual last spring frost, about 184 days away. Fall's first freeze usually shows up around 12/03, roughly 280 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Jacksonville in Zone 9a (20 to 25°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
Jacksonville's growing season runs out in roughly 14 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Jacksonville's last frost
02/28 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/30 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/23 and only about 1 year in 10 sees frost after that.
Jacksonville against the rest of the dataset
About 280 days separate Jacksonville's last and first frost, putting it 4,825 of 40,283 ZIP codes nationally. Within FL, it ranks 1,428 of 1,609.
Learn more
Two guides worth reading on 32221: zone vs. frost date, on why Zone 9a and Jacksonville's frost date answer different questions, and the frost range, on how to read the range around Jacksonville's dates instead of trusting one.