Smyrna, GA 30321 Frost Dates
30321, near Smyrna, GA: the frost window
Around 03/24 is the usual last spring frost, about 208 days away. Fall's first freeze usually shows up around 11/08, roughly 231 days after the last spring frost.
Zone 8b (15 to 20°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 Smyrna, not a forecast for this year.
Stretching the season past the first frost
Smyrna's growing season runs out in roughly 10 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 Smyrna's last frost
03/24 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/02 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/10 and only about 1 year in 10 sees frost after that.
Smyrna against the rest of the dataset
About 231 days separate Smyrna's last and first frost, putting it 10,094 of 40,283 ZIP codes nationally. Within GA, it ranks 501 of 921.
Learn more
Two guides worth reading on 30321: local microclimates, on what one yard in Smyrna can differ from the 30321 normal, and zone vs. frost date, on why Zone 8b and Smyrna's frost date answer different questions.