Johnston, SC 29832 Frost Dates
Johnston, SC: when does the frost end?
The last spring frost here typically falls around 03/16, about 200 days from today. Fall's first freeze usually shows up around 11/13, roughly 244 days after the last spring frost.
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 Johnston, not a forecast for this year.
Stretching the season past the first frost
With roughly 11 weeks until Johnston's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Johnston's last frost
03/16 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/23 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/02 and only about 1 year in 10 sees frost after that.
Johnston against the rest of the dataset
At roughly 244 frost-free days, Johnston places 8,235 of 40,283 ZIP codes in this dataset. Within SC, it ranks 162 of 519.
Learn more
Before leaning on 29832's figures: zone vs. frost date explains why Zone 8a and Johnston's frost date answer different questions, while the frost range explains how to read the range around Johnston's dates instead of trusting one.