Charleston, TN 37310 Frost Dates
37310, near Charleston, TN: the frost window
Typically, the last spring freeze lands around 04/06, roughly 221 days out. Fall's first freeze usually shows up around 10/31, roughly 208 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Charleston in Zone 7b (5 to 10°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
Charleston's growing season runs out in roughly 9 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 Charleston's last frost
04/06 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/20 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/24 and only about 1 year in 10 sees frost after that.
Charleston against the rest of the dataset
At roughly 208 frost-free days, Charleston places 15,691 of 40,283 ZIP codes in this dataset. Within TN, it ranks 388 of 770.
Learn more
Two guides worth reading on 37310: zone vs. frost date, on why Zone 7b and Charleston's frost date answer different questions, and the frost range, on how to read the range around Charleston's dates instead of trusting one.