Range.—North and Central America. The range of the marbled godwit is now greatly restricted, the breeding areas being principally in North Dakota and central Saskatchewan and it is now extremely rare in winter anywhere on the Atlantic coast.
Breeding range.—North to Alberta (probably Edmonton); Saskatchewan (Osler and Crescent Lake); Manitoba (Winnipeg); and Wisconsin (Iron County). East to Wisconsin (Iron County, Stoughton, and Lake Koshkonong); and Iowa (Newton). South to Iowa (Newton and probably Sioux City); South Dakota (Miner County and probably Huron); and Montana (Billings). West to Montana (Billings and Strater); and Alberta (Medicine Hat and probably Edmonton). It also has been detected in summer at Okanagan, British Columbia, Pelican Narrows, Saskatchewan, Moose Lake, Manitoba, and York Factory, Manitoba.
Winter range.—North to Lower California (Magdalena Bay and La Paz); Sinaloa (Mazatlan); Oaxaca (Tehuantepec); western Yucatan; probably Texas (Corpus Christi); probably Louisiana; and Georgia (Savannah). East to Georgia (Savannah and Darien); Florida (Amelia Island, Tarpon Springs, Fort Myers, and Miami); eastern Yucatan (Cozumel Island); and British Honduras (Belize). South to British Honduras (Belize); and Guatemala (Chiapam). West to Guatemala (Chiapam); probably Colima (Manzanillo); and Lower California (Magdalena Bay). Marbled godwits formerly wintered north to southeastern South Carolina (Frogmore) and they are casual at this season in southern California (San Diego, Lake Elsinore, La Jolla, and Humboldt Bay).
Spring migration.—Early dates of arrival are: Missouri, St. Louis, April 13, Boonville, April 16, and Corning, April 18; Illinois, Warsaw, April 2, Calumet, April 4, and Rockford, April 8; Ohio, Lakeside, April 20, and Columbus, April 21; Michigan, Ann Arbor, May 5; Iowa, Emmetsburg, April 21, and Gilbert Station, April 23; Minnesota, Heron Lake, April 8, Wilder, April 19, and Goodhue, April 20; Nebraska, Lincoln, April 18; North Dakota, Bismarck, April 30, Jamestown, May 1, and Harrisburg, May 5; Manitoba, Oak Lake, April 25, Reaburn, May 2, Margaret, May 7, and Winnipeg, May 11; Saskatchewan, Indian Head, April 16, McLean, April 16, South Qu'Appelle, April 20, and Wiseton, April 24; Colorado, Loveland, April 20, Larimer County, April 26; Wyoming, Cheyenne, May 1, and Douglas, May 15; Montana, Milk River, May 18; Alberta, Flagstaff, May 10, and Alliance, May 11; California, Santa Barbara, April 27, San Buenaventura, April 28; and Washington, Grays Harbor, April 9.
Late dates of spring departure are: Florida, Amelia Island, May 15; Georgia, Wolf Island, April 30; South Carolina, Hilton Head, April 24; Missouri, Warrensburg, May 4, and Boonville, May 31; Illinois, Chicago, May 26; Nebraska, Valentine, May 16; Colorado, Durango, May 28, and Barr, May 30; Lower California, San Martin Island, April 10, and Turtle Bay, April 14; and California, Sandyland, June 9, Santa Barbara, June 15, and Los Angeles, June 16.
Fall migration.—Early dates of arrival in the fall are: California, Los Angeles, July 7; Lower California, San Quentin, August 6, and Cape San Lucas, September 9; Wyoming, Douglas, July 31; Colorado, Barr, June 24; Illinois, Chicago, July 22; Ohio, Pelee Island, July 24; Maine, near Portland, August 8; New Hampshire, Seabrook, August 17, and Rye Beach, August 27; Massachusetts, Eastham, August 10; Connecticut, West Haven, August 26; New York, Lawrence, July 21; North Carolina, Pea and Brodie Islands, July 11; South Carolina, Ladys Island, August 21, and Bay Point, August 24; and Florida, St. Marks, September 11.
Late dates of fall departure are: California, Nigger Slough, November 15, Humboldt Bay, December 7, and San Diego, December 12; Colorado, Denver, September 5, Boulder, September 18, and San Luis Lake, October 1; Saskatchewan, Ravine Bank, August 25, and Defoe-Guernsey Camp, August 26; Manitoba, Margaret, September 22; North Dakota, Charlson, September 16, and Westhope, September 24; Nebraska, Lincoln, October 16; Michigan, Newberry, September 23; Ohio, Sandusky Bay, October 12; Illinois, northeastern part, October 20; Quebec, Montreal, September 3; Maine, Popham Beach, September 13; Massachusetts, Newburyport, September 7; New York, Shinnecock Bay, September 15; New Jersey, Cape May, September 14; North Carolina, Beaufort, November 17; and South Carolina, Mount Pleasant, November 3.
Casual records.—The marbled godwit has on several occasions been recorded outside of its normal range principally to the south and east of its winter quarters. Among these are: Ecuador (Santa Rosa, 1877); Lesser Antilles (Grenada, August 29, 1881, and also from the islands of Carriacou and Trinidad); Porto Rico (recorded from Boqueron by Gundlach); and Cuba (recorded from Cardenas in September by Gundlach). It also has been noted from Alabama (near Greensboro, in 1880, and Dauphin Island, August 21, 1911); Ontario (Toronto, May 30, 1895, and June 7, 1890); Arizona (San Pedro River, January 27, 1886); and Alaska (Ugashik, July 16 and 18, 1881, Nelson Island, July 5, 1910, and Point Barrow, August 26, 1897).
Egg dates.—Saskatchewan: 38 records, May 15 to June 27; 19 records, May 30 to June 9. Minnesota and Dakotas: 16 records, May 10 to June 14; 8 records, May 25 to June 8.