This species occurs in the United States and Canada: from Kansas, Missouri, and Illinois northward to Alberta, Saskatchewan, and Manitoba. This includes parts of North Dakota, South Dakota, Nebraska, Indiana, Wisconsin, Minnesota, and Ontario; and all of Iowa. Eastern (Illinois, Indiana, Wisconsin, Ontario) and southern (Kansas, Missouri) parts of its range seem to be shrinking rapidly with few populations (often estimated to be less than 10 per state or province) known to remain extant. Populations in Alberta, Manitoba, and Saskatchewan still seem to be relatively common.