Range.—North America.
Breeding range.—The myrtle warbler breeds north to northern Alaska (Kobuk River and timberline on the south slope of the Brooks Range); northern Yukon (La Pierre House); northern Mackenzie (Aklavik; Fort Anderson; MacTavish Bay, Bear Lake; Lake Hardisty, and Artillery Lake); northern Manitoba (Lac du Brochet, Cochrane River, and Churchill); northern Ontario (Moose Factory); southern Labrador (Grand Falls and Rigolet, possibly Nain and Okkak). East to eastern Labrador (Rigolet and Cartwright); Newfoundland (St. Anthony, Canada Bay, and St. John’s); and Nova Scotia (Cape Breton Island, Sable Island, Halifax, and Yarmouth). South to southern Nova Scotia (Yarmouth); New Brunswick (Grand Manan); southern Maine (Gouldsboro, Deer Isle, Bath, and Auburn); New Hampshire (Concord); central and southern Massachusetts (Marlboro, Webster, and Pelham); southwestern Vermont (Bennington); northern New York (Falls Pond and Buffalo); rarely northeastern Pennsylvania (Pocono Lake); accidentally in northern Maryland (Havre de Grace); southern Ontario (London and Sarnia); northern Michigan (Crawford County and Douglas Lake); northern Wisconsin (Antigo, probably, Trout Lake, Namekagon Lake, and Superior); central Minnesota (St. Cloud, Brainerd, and Bemidji); southern Manitoba (Winnipeg and Aweme); central Saskatchewan (Flotten Lake and Prince Albert); central Alberta (Flagstaff, Camrose, Lobstick River, and Wipiti River); northern British Columbia (Fort St. John, Ingenika River, and Buckley Lake); and southern Alaska (Admiralty Island, Sitka, Seldovia, and Nushagak). West to western Alaska (Nushagak, Russian Mission, St. Michael, and the Kobuk River).
Winter range.—The myrtle warbler winters in two discontinuous areas. The principal winter home is north to central Oklahoma (Oklahoma City); northern Arkansas (Winslow, Little Rock, and Helena); western Tennessee (Memphis); southern Illinois (Anna and Mount Carmel); southern Kentucky (Bowling Green); central Virginia (Lexington); District of Columbia (Washington); southeastern Pennsylvania (Philadelphia); northern New Jersey (Morristown and Elizabeth); southern Connecticut (New Haven); Rhode Island (Providence); and northeastern Massachusetts (Cape Ann). It also occurs in winter irregularly north to Holly, Colo.; Hays and Manhattan, Kan.; Madison, Wis.; Chicago, Ill.; Battle Creek and Rochester (one banded in January), Mich.; Rochester, N. Y.; and Portland, Maine. East to Massachusetts (Cape Ann) and along the Atlantic coast to Florida (Miami and Key West); the Bahama Islands (Little Abaco and Caicos); Dominican Republic (Puerto Plato and Sánchez); Puerto Rico (San Juan); St. Croix Island; and rarely, Antigua. South to Antigua, northern Colombia, rare or accidental (Santa Marta region); and Panamá (Pearl Islands). West to Panamá (Pearl Islands, Canal Zone, and Almirante); Costa Rica (El General and Guayabo); eastern Nicaragua (Greytown and the Río Escondido); northern Honduras (Puerto Castilla and Lancetilla); western Guatemala (Dueñas and Tecpán); eastern Oaxaca (Tehuantepec); Veracruz (Orizaba); Tamaulipas (Victoria); Nuevo León (Monterrey); southwestern Texas (mouth of the Pecos River, Camp Barkeley, Taylor County, and Fort Worth); and central Oklahoma (Oklahoma City).
The western winter range is north to central Western Oregon (Newport and Albany). East to western Oregon (Albany); central California (Marysville, Stockton, Mariposa County, Redlands, and Potholes); southern Arizona (Tucson and Tombstone); and southwestern Sonora (Guaymas). South to southern Sonora. West to western Sonora (Guaymas and the Colorado River delta); western California (San Clementi Island, Santa Barbara, San Francisco Bay region, and Eureka); and western Oregon (Coss Bay and Newport).
The species as outlined is divided into two subspecies or geographic races. The Alaska myrtle warbler (D. c. hooveri) breeds from western Alaska and northwestern Mackenzie to central Alberta and central British Columbia; the eastern myrtle warbler (D. c. coronata) from western Saskatchewan eastward.
Migration.—Late dates of spring departure from the winter home are: Costa Rica—Guayabo, March 18. El Salvador—Volcán de San Miguel, March 22. Guatemala—Nebaj, April 27. Honduras—Lancetilla, March 17. Mexico—Valles, San Luis Potosí, May 2. Puerto Rico—Mayagüez, April 8. Haiti—Port-au-Prince, April 27. Cuba—Habana, April 28. Bahamas—New Providence, April 2. Florida—Pensacola, May 13. Alabama—Birmingham, May 8. Georgia—Atlanta, May 20. South Carolina—Greenwood, May 12. Louisiana—Mansfield, May 2. Mississippi—Oxford, May 8. Tennessee—Nashville, May 17. Arkansas—Helena, May 18. Texas—Bonham, May 6. Oklahoma—Norman, May 3.
Early dates of spring arrival are: New York—New York, April 1. Massachusetts—Lynn, April 11. Vermont—St. Johnsbury, April 12. Maine—Portland, April 6. New Brunswick—Scotch Lake, April 11. Nova Scotia—Yarmouth, April 11. Quebec—Hatley, April 22. Newfoundland—St. Anthony, April 25. Labrador—Cartwright, May 24. Illinois—Chicago, March 24. Indiana—Bloomington, March 26. Ohio—Youngstown, April 1. Ontario—Harrow, April 3. Michigan—Sault Ste. Marie, April 9. Missouri—Columbia, March 27. Iowa—Sigourney, April 3. Wisconsin—New London, April 1. Minnesota—Minneapolis, April 4. Kansas—Independence, April 7. Nebraska—Red Cloud, April 1. South Dakota—Brookings, April 7. North Dakota—Fargo, April 13. Manitoba—Aweme, April 12. Saskatchewan—Eastend, April 22. Mackenzie—Simpson, May 7. New Mexico—San Antonio, April 18. Colorado—Colorado Springs, April 17. Wyoming—Laramie, April 15. Montana—Kirby, April 29. Alberta—Glenevis, April 14. Washington—Seattle, March 14. British Columbia—Courtenay, March 31; Atlin, April 21. Yukon—Sheldon Lake, April 26. Alaska—Wrangell, April 29; Fairbanks, May 7.
Late dates of spring departure of transients are: District of Columbia—Washington, June 1. Pennsylvania—Warren, June 6. Illinois—Chicago, June 3. Indiana—Waterloo, June 3. Ohio—Oberlin, May 31. Missouri—Concordia, May 25. Iowa—Grinnell, June 1. Nebraska—Nenzel, May 27. North Dakota—Argusville, May 30. California—Red Bluff, May 3. Nevada—Quinn River Crossing, May 21. Washington—Tacoma, May 3.
Late dates of fall departure are: British Columbia—Atlin, September 19; Courtenay, October 14. Mackenzie—Nahami River, October 25. Wyoming—Laramie, November 25. Saskatchewan—Yorkton, October 14. Manitoba—Brandon, October 31. North Dakota—Argusville, November 15. South Dakota—Faulkton, November 15. Kansas—Lawrence, November 12. Minnesota—St. Paul, November 5. Wisconsin—Racine, November 16. Iowa—Wall Lake, November 15. Missouri—Kansas City, November 16. Illinois—Murphysboro, November 21. Michigan—Detroit, November 19. Indiana—Indianapolis, November 20. Ontario—Point Pelee, November 23. Ohio—Toledo, November 17. Newfoundland—Tompkins, October 4. Prince Edward Island—North River, October 15. Quebec—Kamouraska, November 9. New Brunswick—Saint John, November 4. Maine—Portland, November 9. New Hampshire—Durham, November 4. Massachusetts—Boston, November 27. New York—Brooklyn, November 22. Pennsylvania—Doylestown, November 29.
Early dates of fall arrival are: Washington—Bellingham, September 28. Oregon—Thurston, October 5. California—Eureka, October 12. Wyoming—Yellowstone Park, August 25. North Dakota—Fargo, September 8. South Dakota—September 15. Nebraska—Fairbury, September 30. Kansas—Lawrence, September 26. Oklahoma—Oklahoma City, October 12. Texas—Somerset, October 10. Iowa—Grinnell, September 6. Missouri—St Louis, September 17. Illinois—Chicago, August 31. Indiana—Hobart, September 2. Ohio—Austinburg, August 25. Kentucky—Bowling Green, September 14. Tennessee—Athens, October 3. Arkansas—Rogers, October 4. Louisiana—Monroe, September 26. Mississippi—Edwards, September 22. New York—Rhinebeck, August 31. Pennsylvania—Pittsburgh, September 8. District of Columbia—Washington, September 9. West Virginia—Bluefield, September 12. Virginia—Naruna, September 22. North Carolina—Mount Mitchell, September 30. South Carolina—Spartanburg, September 21. Georgia—Round Oak, October 10. Alabama—Anniston, October 8. Florida—New Smyrna, October 4. Bahamas—Cay Lobos, November 22. Cuba—Habana, November 17. Dominican Republic—San Juan, October 1. Puerto Rico—Mayagüez, December 14. Costa Rica—Carrillo, October 2.