When to plant Chinese cabbage in Maine

In spring, from Apr 1 – May 15 in Biddeford to May 1 – June 15 in Sanford.

In fall, from June 1 – July 15 in Bangor to July 15 – Aug 15 in Lewiston.

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

Chinese cabbage planting dates by place in Maine
PlaceSpringFall
AuburnFall-plantedJuly 15 – Aug 15
AugustaFall-plantedJuly 15 – Aug 15
BangorFall-plantedJune 1 – July 15
BiddefordApr 1 – May 15June 1 – July 15
LewistonFall-plantedJuly 15 – Aug 15
PortlandFall-plantedJune 15 – Aug 1
SacoFall-plantedJune 15 – Aug 1
SanfordMay 1 – June 15June 1 – July 15
South PortlandFall-plantedJune 15 – Aug 1
WatervilleFall-plantedJune 15 – Aug 1
WestbrookFall-plantedJune 15 – 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 chinese cabbage.