The distribution of the western mastiff bat is patchy. It can be found from the coast of the southwestern United States into central Mexico and southeast to Cuba. The northern limit of its range is the southern half of California. In the United States it extends southeast into western Texas through southern Nevada and southwestern Arizona. The southern limit of its range is in Argentina. This species is non-migratory (Hall, 1981, Allen, 1987, Cockrum, 1960).
Biogeographic Regions: nearctic (Native ); neotropical (Native )