Costa's Hummingbird breeds throughout the Sonoran and Mojave deserts of Arizona and southern California south through Baja California (Sibley 2014). In Montana, this species has a single record over the past decade (Montana Bird Distribution Committee 2012).
For a comprehensive review of the conservation status, habitat use, and ecology of this and other Montana bird species, please see Marks et al. 2016, Birds of Montana.
Direct Evidence of Breeding
Indirect Evidence of Breeding