When to plant Swiss chard in Maryland

In spring, from Feb 20 – May 15 in Baltimore to Apr 1 – June 15 in Westminster.

In fall, June 1 – Sept 10.

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

Swiss chard planting dates by place in Maryland
PlaceSpringFall
AberdeenMar 15 – June 15June 1 – Sept 10
AnnapolisMar 1 – May 25June 1 – Sept 15
BaltimoreFeb 20 – May 15June 1 – Oct 1
Bel AirMar 15 – June 15June 1 – Sept 10
BowieApr 1 – June 15June 1 – Aug 1
CambridgeMar 1 – May 25June 1 – Sept 15
College ParkMar 15 – June 15June 1 – Sept 10
CumberlandMar 15 – June 15June 1 – Aug 1
EastonMar 1 – May 25June 1 – Sept 15
ElktonMar 15 – June 15June 1 – Sept 10
FrederickMar 1 – May 25June 1 – Sept 15
GaithersburgMar 1 – May 25June 1 – Sept 15
GreenbeltMar 15 – June 15June 1 – Sept 10
HagerstownMar 15 – June 15June 1 – Sept 10
Havre de GraceMar 15 – June 15June 1 – Sept 10
HyattsvilleMar 1 – May 25June 1 – Sept 15
La PlataApr 1 – June 15June 1 – Sept 10
LaurelMar 15 – June 15June 1 – Sept 15
New CarrolltonApr 1 – June 15June 1 – Aug 1
RockvilleMar 1 – May 25June 1 – Sept 15
SalisburyMar 1 – May 25June 1 – Sept 15
Takoma ParkMar 1 – May 25June 1 – Sept 15
WestminsterApr 1 – June 15June 1 – Aug 1

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 swiss chard.