North American Ecology (US and Canada)

Oeneis juttais resident throughout most of Canada and Alaska, and south into the United States along the Rocky Mountains (Scott 1986). Habitats are spruce bogs in the east and north to the edge of tundra and in mature grassy lodgepole pine forest from Alberta to Colorado. Host plants are restricted to sedges (Cyperaceae) and Juncus species (Juncaceae). Eggs are laid haphazardly near the host plant. This species is biennial; individuals overwinter as young larvae (first-third instar) the first winter, and older larvae (fourth-six instar) the second winter. There is one flight each year with the approximate flight time mostly June 15- July 15 with some variation depending on location (Scott 1986).