Builds nests of grass and the shredded inner bark of cedar trees in natural or abandoned tree and post hollows, cliff crevices, abandoned mines, barns, cabins, odd building nooks and crannies, and birdhouses
Bluebird trails have become very popular including in the far northern reaches of its range.
Lays three to seven greenish blue eggs which hatch after about two weeks incubation and young leave the nest in about another three weeks.

Eats mostly insects which it preys for near or on the ground.

The Mountain Bluebird Mountain Bluebird House (same as for Western Bluebird) has a 5" by 5" floor, 9" inside ceiling, 1 9/16" diameter entrance hole located 7" above the floor and ventilation openings. Hinged roof is secured with shutter hooks.

English sparrows, tree swallows, violet green swallows, chickadees, titmice, wrens, nuthatches and downy woodpeckers may use this box.

Mount bluebird houses 3’ - 6’ high on a post in woodland clearings, shelter belt edges bordering fields, among scattered trees, or pasture fence lines. Make a "bluebird trail" of several houses about 100 yards apart; further in wide open expanses and closer in clearings of wooded areas.

On fence lines mount houses on the sides of posts facing the next post. The recessed position helps avoid cattle or other large animals that like to rub against them. Monitor the boxes for unwanted squatters. Deter predators with steel posts or sheet metal wrapped around wood posts. Avoid shade, but also avoid direct sunlight through the entrance if possible.