The hind foot, long and broad, measures 117-147mm in length. The ears are 62-70 mm from notch to tip.
Males are slightly smaller than females, as is typical for leporids.
In the summer, the coat is a grizzled rusty or greyish brown, with a blackish middorsal line, buffy flanks and a white belly. The face and legs are cinnamon brown. The ears are brownish with black tips and white or creamy borders. During the winter, the fur is almost entirely white, except for black eyelids and the blackened tips on the ears. The diet of the snowsow hare is variable, These animals browse on green grasses, forbs, bluegrass, brome, vetches, asters, jewelweed, wild strawberry, pussy-toes, dandelions.