Seneca, SC 29665 Frost Dates
Seneca, SC: when does the frost end?
Around 03/21 is the usual last spring frost, about 205 days away. Fall's first freeze usually shows up around 11/11, roughly 236 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 Seneca, not a forecast for this year.
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
Seneca's growing season runs about 236 days, ranking 9,418 of 40,283 US ZIP codes measured here, longest to shortest. Within SC, it ranks 256 of 519.
Learn more
Before leaning on 29665's figures: the frost range explains how to read the range around Seneca's dates instead of trusting one, while local microclimates explains what one yard in Seneca can differ from the 29665 normal.