Williams, SC 29493 Frost Dates
29493, near Williams, SC: the frost window
Around 03/23 is the usual last spring frost, about 207 days away. Fall's first freeze usually shows up around 11/06, roughly 233 days after the last spring frost.
Zone 8b (15 to 20°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Williams, not a forecast for this year.
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.
The actual range around Williams's last frost
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
At roughly 233 frost-free days, Williams places 10,006 of 40,283 ZIP codes in this dataset. Within SC, it ranks 306 of 519.
Learn more
Two guides worth reading on 29493: local microclimates, on what one yard in Williams can differ from the 29493 normal, and zone vs. frost date, on why Zone 8b and Williams's frost date answer different questions.