When to plant Potatoes in Delaware

In spring, from Feb 20 – Mar 20 in Dover to Mar 10 – Apr 1 in Wilmington.

In fall, July 20 – Aug 10.

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

Potatoes planting dates by place in Delaware
PlaceSpringFall
DoverFeb 20 – Mar 20July 20 – Aug 10
MiddletownMar 10 – Apr 1July 20 – Aug 10
MilfordMar 10 – Apr 1July 20 – Aug 10
NewarkMar 10 – Apr 1July 20 – Aug 10
SmyrnaFeb 20 – Mar 20July 20 – Aug 10
WilmingtonMar 10 – Apr 1July 20 – Aug 10

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 potatoes.