In North America, the White-winged Scoter breeds from Northern Alaska to the northern regions of British Columbia, Alberta, Saskatchewan, Manitoba, Ontario, and Quebec and winters down the Pacific coast from the Aleutian Islands to Baja California, the Atlantic coast from Newfoundland through the Gulf of Mexico, and along the Great Lakes. The species is an uncommon migrant through Montana with fewer than six observations reported in a typical year (Brown et al. 2019, MTNHP 2019).
For a comprehensive review of the conservation status, habitat use, and ecology of this and other Montana bird species, please see Marks et al. 2016, Birds of Montana.
Direct Evidence of Breeding
Indirect Evidence of Breeding
The destination of migrants is unknown; it could be either the east or west coast.