Arctic grayling are widespread in Arctic Ocean drainages from Hudson Bay, Canada to Alaska and in Arctic and Pacific drainages to central Alberta and British Columbia in Canada. They do not occur naturally in the Fraser and Columbia river basins. There are remnant native populations of fluvial Arctic grayling in the upper Missouri River drainage in the Big Hole River and Red Rock basin (Montana Arctic grayling). Fluvial Arctic grayling have been reestablished in the upper Ruby River, a tributary of the Beaverhead River. The native range formerly extended south into the Great Lakes basin in Michigan. They occur naturally in the Arctic Ocean basin in Siberia from the Ob to Yenisei drainages and in European Russia in some tributaries of Pechora river. Lake dwelling forms of Arctic grayling have been introduced in suitable lake habitats throughout the Rocky Mountains including lakes in the Teton Range in Wyoming and the high Uinta Mountains in Utah), Cascade Mountains and Sierra Nevada Mountains as far south as Arizona.