Simpsonville, SC 29681 Frost Dates
29681, near Simpsonville, SC: the frost window
Around 03/16 is the usual last spring frost, about 200 days away. Fall's first freeze usually shows up around 11/20, roughly 250 days after the last spring frost.
Simpsonville sits in USDA Zone 8a (10 to 15°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
Simpsonville's growing season runs out in roughly 12 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 03/16 isn't a guarantee
03/16 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/26 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/02 and only about 1 year in 10 sees frost after that.
Simpsonville against the rest of the dataset
At roughly 250 frost-free days, Simpsonville places 7,467 of 40,283 ZIP codes in this dataset. Within SC, it ranks 125 of 519.
Learn more
Two guides worth reading on 29681: the frost range, on how to read the range around Simpsonville's dates instead of trusting one, and local microclimates, on what one yard in Simpsonville can differ from the 29681 normal.