Sumter, SC 29040 Frost Dates
29040, near Sumter, SC: the frost window
Typically, the last spring freeze lands around 03/21, roughly 205 days out. Fall's first freeze usually shows up around 11/13, roughly 239 days after the last spring frost.
Sumter sits in USDA Zone 8b (15 to 20°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
Sumter's growing season runs out in roughly 11 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
03/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/28 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/09 and only about 1 year in 10 sees frost after that.
Sumter against the rest of the dataset
About 239 days separate Sumter's last and first frost, putting it 8,768 of 40,283 ZIP codes nationally. Within SC, it ranks 191 of 519.
Learn more
Two guides worth reading on 29040: local microclimates, on what one yard in Sumter can differ from the 29040 normal, and zone vs. frost date, on why Zone 8b and Sumter's frost date answer different questions.