Bullock’s orioles (Icterus bullockii) are native to western North America, especially most of the western United States. They are common throughout most of their range (Jaramillo and Burke 1999). They are found as far north as southern British Columbia during the breeding season, (Jaramillo and Burke 1999; Rising and Williams 1999) but the winter range is largely confined to Mexico (Jaramillo and Burke 1999; Howell and Webb 1995). Though no geographic boundary hinders movement to the east, the range generally ends in the western counties of North Dakota, South Dakota, Kansas, and in central Texas (Jaramillo and Burke 1999; Rising and Williams 1999). The breeding range extends into southern Canada, including Vancouver Island, British Columbia, Alberta, and Saskatchewan (Jaramillo and Burke 1999; Rising and Williams 1999). Bullock’s orioles also breed in Durango, Sonora, and Baja states of northern Mexico (Howell and Webb 1995; Jaramillo and Burke 1999). Bullock’s orioles are absent from southwestern Arizona and high elevation, arid portions of Idaho (Rising and Williams 1999).  During winter, Bullock’s orioles may be found throughout Mexico, from Sinaloa south and east through central Mexico to Oaxaca. They are occasionally seen during the winter months in Baja California and in Guatemala (Howell and Webb 1995; Jaramillo and Burke 1999; Rising and Williams 1999). (Howell and Webb, 1995; Jaramillo and Burke, 1999; Rising and Williams, 1999)

 

Biogeographic Regions: Nearctic; Nearctic :: Native