Williams, SC 29475 Frost Dates
29475, near Williams, SC: the frost window
Typically, the last spring freeze lands around 03/23, roughly 207 days out. Fall's first freeze usually shows up around 11/06, roughly 233 days after the last spring frost.
Williams 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
Williams's growing season runs out in roughly 10 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 03/23 isn't a guarantee
03/23 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 04/11 and only about 1 year in 10 sees frost after that.
Williams against the rest of the dataset
About 233 days separate Williams's last and first frost, putting it 10,005 of 40,283 ZIP codes nationally. Within SC, it ranks 305 of 519.
Learn more
Two guides worth reading on 29475: the frost range, on how to read the range around Williams's dates instead of trusting one, and local microclimates, on what one yard in Williams can differ from the 29475 normal.