When to plant Onions in South Carolina

In spring, from Jan 1 – Feb 1 in Beaufort to Mar 15 – Apr 10 in Gaffney.

In fall, from Sept 1 – Oct 15 in Aiken to Oct 1 – Dec 31 in Port Royal.

Dates are for setting out plants. USDA's earliest safe spring and latest safe fall planting dates, matched to each place's average frost dates.

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

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 plants.