It is found widespread in western North America, west of south-central Alberta, Wyoming, and Nebraska.

It can be found from sea level to altitudes over 2000 meters in a variety of habitats from dense forest to shrub desert.

It is the most variable species in the genus Aseptis with respect to forewing color and pattern strength.

In the south the flight begins in March at low elevations and in April to July in the mountains.

The larvae feed on various broadleaf trees and shrubs, including big-leaf maple, ocean spray, and Ceanothus species.