Hilton Head Island, SC 29915 Frost Dates
Hilton Head Island, SC: when does the frost end?
Typically, the last spring freeze lands around 03/03, roughly 187 days out. Fall's first freeze usually shows up around 12/09, roughly 282 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Hilton Head Island in Zone 9a (20 to 25°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 15 weeks until Hilton Head Island's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Hilton Head Island's last frost
03/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/02 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/20 and only about 1 year in 10 sees frost after that.
Hilton Head Island against the rest of the dataset
At roughly 282 frost-free days, Hilton Head Island places 4,765 of 40,283 ZIP codes in this dataset. Within SC, it ranks 12 of 519.
Learn more
Before leaning on 29915's figures: local microclimates explains what one yard in Hilton Head Island can differ from the 29915 normal, while zone vs. frost date explains why Zone 9a and Hilton Head Island's frost date answer different questions.