Clarksburg, TN 38321 Frost Dates
38321, near Clarksburg, TN: the frost window
Typically, the last spring freeze lands around 04/02, roughly 217 days out. Fall's first freeze usually shows up around 10/31, roughly 211 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Clarksburg 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
Clarksburg'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.
How much risk comes with planting early here
04/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/16 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/18 and only about 1 year in 10 sees frost after that.
Clarksburg against the rest of the dataset
At roughly 211 frost-free days, Clarksburg places 14,865 of 40,283 ZIP codes in this dataset. Within TN, it ranks 309 of 770.
Learn more
Two guides worth reading on 38321: zone vs. frost date, on why Zone 7b and Clarksburg's frost date answer different questions, and the frost range, on how to read the range around Clarksburg's dates instead of trusting one.