Sebago was released by the USDA and the Maine Agricultural Experiment Station in 1938. It is one of the progeny of a cross between Chippewa and Katahdin, and was tested as USDA seedling 4488. In the Great Lakes and Northeast Regions, Sebago is a very late maturing variety. It has medium to high yield potential, and was released primarily for its moderate field resistance to late blight. In addition to its adaptation to the Northeast, it has been grown in southern production areas as a table and chipstock variety.
Plants are large, erect or spreading.
Leaves are medium in length, broad and open. Leaflets are broadly ovate, large and dark green. Tubers are elliptical to round, medium-thick with a smooth ivory skin. Specific gravity is medium to low. Tuber dormancy is short.