North American Ecology (US and Canada)

Euphydryas gillettii is resident to parts of Montana, Wyoming, Idaho, the Dakotas and Alberta (Scott 1986). Habitats are moist valley openings and meadows near strams and conifers (mostly spruce and pine), sometimes with sagebrush nearby, and Hudsonian zone meadows in central Wyoming. Host plants can be shrubs or herbs and include species from several families, including Caprifoliaeae, Scrophulariaceae, and Valerianaceae. Individuals overwinter as larvae (of different stages depending on altitude). There is one flight each year with the approximate flight time late June to July 31; subalpine ecotypes fly late July-Aug.15 (Scott 1986).