Resident in northern North America (Scott 1986). Habitats are LUSH ARCTIC/ALPINE ZONE TUNDRA AND HUDSONIAN TAIGA. Host plants are usually herbaceous with most known hosts a few species from Leguminosae and Salicaceae. There is one flight each year with the approximate flight time JUNE1-JUL15 (Scott 1986). Sometimes includes Colias canadensis as a subspecies (Scott 1986).