Seneca, SC 29672 Frost Dates
Seneca, SC: when does the frost end?
Typically, the last spring freeze lands around 03/21, roughly 205 days out. Fall's first freeze usually shows up around 11/11, roughly 236 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Seneca in Zone 8a (10 to 15°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 11 weeks until Seneca's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
03/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/01 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/07 and only about 1 year in 10 sees frost after that.
Seneca against the rest of the dataset
About 236 days separate Seneca's last and first frost, putting it 9,419 of 40,283 ZIP codes nationally. Within SC, it ranks 257 of 519.
Learn more
Before leaning on 29672's figures: local microclimates explains what one yard in Seneca can differ from the 29672 normal, while zone vs. frost date explains why Zone 8a and Seneca's frost date answer different questions.