When to plant Lettuce in North Dakota

In spring, from Apr 1 – June 1 in Fargo to May 1 – June 30 in Williston.

In fall, June 1 – Aug 1.

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

Leaf lettuce planting dates by place in North Dakota
PlaceSpringFall
BismarckApr 15 – June 15June 1 – Aug 1
DickinsonMay 1 – June 30June 1 – Aug 1
FargoApr 1 – June 1June 1 – Aug 1
Grand ForksApr 15 – June 15June 1 – Aug 1
JamestownApr 15 – June 15June 1 – Aug 1
MandanApr 15 – June 15June 1 – Aug 1
MinotApr 15 – June 15June 1 – Aug 1
West FargoApr 1 – June 1June 1 – Aug 1
WillistonMay 1 – June 30June 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 leaf lettuce.