Williamston, SC 29697 Frost Dates
Frost dates for Williamston, SC, ZIP 29697
Around 03/23 is the usual last spring frost, about 207 days away. The first fall frost typically arrives around 11/11, about 234 frost-free days later.
Zone 8a (10 to 15°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 Williamston, not a forecast for this year.
What to do before the first frost
Zone 8a around Williamston has about 11 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 03/23 isn't a guarantee
03/23 is the middle of 30 years of NOAA records, not a promise. Plant by 03/03 and you're betting against frost in roughly 9 years out of 10. 04/06 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Williamston compares
About 234 days separate Williamston's last and first frost, putting it 9,735 of 40,283 ZIP codes nationally. Within SC, it ranks 271 of 519.
Learn more
local microclimates explains what one yard in Williamston can differ from the 29697 normal, and zone vs. frost date explains why Zone 8a and Williamston's frost date answer different questions.