Charleston, SC 29405 Frost Dates
Charleston, SC: when does the frost end?
Typically, the last spring freeze lands around 03/07, roughly 191 days out. Fall's first freeze usually shows up around 11/27, roughly 266 days after the last spring frost.
Charleston sits in USDA Zone 9a (20 to 25°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
With roughly 13 weeks until Charleston's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Charleston's last frost
03/07 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/12 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/27 and only about 1 year in 10 sees frost after that.
Charleston against the rest of the dataset
About 266 days separate Charleston's last and first frost, putting it 5,907 of 40,283 ZIP codes nationally. Within SC, it ranks 40 of 519.
Learn more
Before leaning on 29405's figures: the frost range explains how to read the range around Charleston's dates instead of trusting one, while local microclimates explains what one yard in Charleston can differ from the 29405 normal.