Callophrys sheridanii has a white postmedian line of dots that may be straight or bulged out, and even reduced or absent.

It is named for its characteristic straight, white line crossing the underside of both wings,[4] although this may be less distinct in specimens from southern British Columbia.

[4][6] From British Columbia, the range extends south through Eastern Washington down to the Sierra Nevada of California.

[1][4][6] Callophrys sheridanii remains within a range of approximately 6,000–10,000 feet (1,800–3,000 m), living in such environments as sagebrush scrub, dry, brushy hillsides in badlands, chaparral, woodlands, subalpine scree, open hillsides, and on canyon slopes and washes.

[4] The caterpillars are a light green to pink color, and are covered with bunches of short stiff pines.