Williams, SC 29929 Frost Dates
Williams, SC: when does the frost end?
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.
The USDA Plant Hardiness Zone Map puts Williams in Zone 8b (15 to 20°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 10 weeks until Williams's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
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
About 233 days separate Williams's last and first frost, putting it 10,007 of 40,283 ZIP codes nationally. Within SC, it ranks 307 of 519.
Learn more
Before leaning on 29929's figures: zone vs. frost date explains why Zone 8b and Williams's frost date answer different questions, while the frost range explains how to read the range around Williams's dates instead of trusting one.