nlike other bluebird species, male Mountain Bluebirds have no chestnut red on their bodies. The head, back, wings, and tail are a bright sky blue. Males are light blue from the chin to the belly, and grayish-white on the belly and undertail coverts.

Females have brownish gray upperparts. The wings, rump, and tail are a pale or light blue. Females sometimes have a pale reddish throat and breast, but more commonly, the throat and breast are gray brown.