_Breeding range._--The breeding range of the knot in North America is imperfectly known, but appears to extend north to Franklin (Winter Harbor, Victoria Land, and Goose Fiord), and Grinnell Land (Fort Conger). East to Greenland (Floeberg Beach, Cape Sheridan, North Star Bay, Tuctoo Valley, Bowdoin Bay, and Disco Bay). South to southwestern Greenland (Disco Bay) and southern Franklin (Igloolik, Winter Island, and Cambridge Bay). West to Franklin (Cambridge Bay and Winter Harbor). Birds breeding in northeast Greenland may be the European form.
It has also been detected in summer in Alaska at Point Barrow, Point Hope, St. Michael, and other localities, where it may possibly breed.
_Winter range._--Not well known but in the Western Hemisphere, seemingly most of South America, from Patagonia (Tierra del Fuego) and Argentina (Barracus al Sud and Cape San Antonio) on the south, Peru (Santa Luzia and probably Tumbez) on the west, Brazil (Iguape) on the east, to possibly Jamaica, Barbados, rarely Louisiana (Vermilion Bay), and Florida (St. Marks).
_Spring migration._--Early dates of spring arrival on the Atlantic coast are: South Carolina, Frogmore, April 8, and Egg Bank, April 16; North Carolina, Pea and Brodie Islands, April 18; Virginia, Locustville, April 10; New Jersey, Absecon Bay, April 21; New York, Long Beach, Long Island, April 29, and Canandaigua Lake, May 23; Connecticut, Norwalk, May 24, Fairfield, May 29, and Westport, May 30; Massachusetts, Tuckernuck Island, May 11, Franklin, Igloolik, June 14; and Greenland, Jacobshaven, June 3, and Cape Union, June 5.
On the Pacific coast, early dates are: California, Alameda, April 25; Washington, Destruction Island Light, May 6, and Willapa Harbor, May 11 [once at Dungeness, on February 25, 1915 (Cantwell)]; British Colombia, Fort Simpson, May 13; and Alaska, Nulato, May 10, Craig, May 13, Admiralty Island, May 14, St. Michael, May 29, and Point Barrow, May 30.
Late dates of spring departure are: South Carolina, near Charleston, June 5; Virginia, Cape Charles, June 10, Cobb Island, June 25, and Wallop's Island, June 27; New Jersey, Cape May County, June 3, and Elizabeth, June 11; New York, Amityville, May 31, and Geneva, June 8; and Massachusetts, Cape Cod, June 13, Harvard, June 19, Marthas Vineyard, June 24, and Monomoy Island, June 28.