Historically, breeding habitat consisted of mountainous areas and seacoasts with cave and rock crevices for nesting. Currently, found in agricultural areas, cities, suburbs, and along highways. Breeding habitat typically has an open habitat component for foraging (Brown and Brown 1999), frequently near water (AOU 1983).
AOU. 1983. Check-list of North American birds. 6th ed.American Ornithologists’ Union, Washington D. C.
Brown, C. R., and M. B. Brown. 1999. Barn Swallow (HIRUNDO RUSTICA). In The Birds of North America, No. 452, (A. Poole and F. Gill, eds.). The Birds of North America, Inc., Philadelphia, PA.