The species breeds on two islands in the Bering Sea, St. Matthew and Hall islands, and winters on the western coast of the US.
The Mckay's snowflake is classified as Near Threatened (NT), is close to qualifying for or is likely to qualify for a threatened category in the near future.
McKay's Snowflake (Plectrophenax Hyperboreus) at Bethel, Alaska (DjVu | PDF) WITMER STONE , Page 269 Notes on the Black Seaside Finch (Ammodramus Nigrescens) (DjVu | PDF) FRANK M. CHAPMAN , Page 270 Nesting Instincts of Swallows (DjVu | PDF) FRANK M. More
McKay's Snowflake {Plectrophe/iax hyperboreus) at Bethel, Alaska, 269; Notes on the Black Seaside Finch {^Ammo- dramus }iigrescens), 2']o; Nesting Instincts of Swallows, 271; Nates on Generic Names of Certain Swallows, 271 ; Accidental death of a_ Contents of Volume XV. More
McKay's Snowflake (Plectrophenax hyperboreus) at Bethel, Alaska McKendrick, A. J. A report of the occurrence of onchocerciasis in Ma-henge, Tanganyika, and in southern area of Lake Victoria McL. Control of worm parasites of sheep McL. Fish problems connected with Grand Coulee dam McL. Hydroids of the 1932, 1933, 1935, and1938Allan Hanoook Pacifio Expeditions McL. Some notes on reproduction in British earthworms McLean card catalogue of American foreminifera; units 2 to 9 incl. figs. More