When to plant Onion sets in South Carolina

In spring, from Jan 1 – Mar 1 in Beaufort to Mar 10 – Apr 1 in Gaffney.

In fall, from Oct 1 – Dec 1 in Aiken to Nov 1 – Dec 31 in Port Royal.

USDA's earliest safe spring and latest safe fall planting dates, matched to each place's average frost dates.

Onion sets planting dates by place in South Carolina
PlaceSpringFall
AikenFeb 1 – Mar 20Oct 1 – Dec 1Now
AndersonFeb 1 – Mar 20Oct 1 – Dec 1Now
BeaufortJan 1 – Mar 1Nov 1 – Dec 31Soon
BlufftonJan 1 – Mar 1Nov 1 – Dec 31Soon
CayceJan 15 – Mar 10Nov 1 – Dec 31Soon
CharlestonJan 1 – 15Nov 1 – Dec 31Soon
ClemsonFeb 15 – Mar 20Not listed
ColumbiaFeb 1 – Mar 20Oct 1 – Dec 1Now
ConwayJan 15 – Mar 10Nov 1 – Dec 31Soon
EasleyFeb 15 – Mar 20Not listed
FlorenceFeb 1 – Mar 20Oct 1 – Dec 1Now
Forest AcresFeb 1 – Mar 20Nov 1 – Dec 31Soon
Fort MillFeb 15 – Mar 20Not listed
Fountain InnFeb 15 – Mar 20Oct 1 – Dec 1Now
GaffneyMar 10 – Apr 1Spring-planted
Goose CreekJan 15 – Mar 10Nov 1 – Dec 31Soon
GreenvilleFeb 15 – Mar 20Oct 1 – Dec 1Now
GreenwoodFeb 15 – Mar 20Oct 1 – Dec 1Now
GreerFeb 15 – Mar 20Oct 1 – Dec 1Now
HanahanJan 15 – Mar 10Nov 1 – Dec 31Soon
HardeevilleJan 1 – Mar 1Nov 1 – Dec 31Soon
Hilton Head IslandJan 1 – Mar 1Nov 1 – Dec 31Soon
IrmoMar 1 – Apr 1Not listed
James IslandJan 1 – 15Nov 1 – Dec 31Soon
LexingtonFeb 1 – Mar 20Oct 1 – Dec 1Now
MauldinFeb 15 – Mar 20Oct 1 – Dec 1Now
Moncks CornerJan 15 – Mar 10Nov 1 – Dec 31Soon
Mount PleasantJan 15 – Mar 10Nov 1 – Dec 31Soon
Myrtle BeachFeb 1 – Mar 20Oct 1 – Dec 1Now
NewberryFeb 15 – Mar 20Oct 1 – Dec 1Now
North AugustaJan 1 – Mar 1Nov 1 – Dec 31Soon
North CharlestonJan 15 – Mar 10Nov 1 – Dec 31Soon
North Myrtle BeachJan 15 – Mar 10Nov 1 – Dec 31Soon
OrangeburgJan 15 – Mar 10Oct 1 – Dec 1Now
Port RoyalJan 1 – Mar 1Nov 1 – Dec 31Soon
Rock HillFeb 15 – Mar 20Oct 1 – Dec 1Now
SimpsonvilleFeb 15 – Mar 20Oct 1 – Dec 1Now
SpartanburgMar 1 – Apr 1Not listed
SummervilleFeb 1 – Mar 20Oct 1 – Dec 1Now
SumterFeb 1 – Mar 20Oct 1 – Dec 1Now
Tega CayFeb 15 – Mar 20Not listed
West ColumbiaFeb 1 – Mar 20Oct 1 – Dec 1Now

Planting dates: USDA Home and Garden Bulletin No. 9 (1967), tables 4 and 5. Frost dates: NOAA U.S. Climate Normals 1991–2020. “—” means the place's frost date is outside the table. The full USDA table for onion sets.