Bluebirds are picky about where they live, so choose the location accordingly. Habitat should be the main factor when considering where to place the houses. They prefer rural areas away from human traffic. Pastureland, acreages, parks (away from human traffic), and mowed areas such as cemeteries, golf courses are all good locations for bluebird houses. Avoid brushy, heavily wooded areas.
If possible place your nest boxes on a pole about 5 feet above ground. If possible, face the box away from prevailing winds and facing towards a tree or shrub which is within 100 feet of the box. Trees and shrubs provide a landing spot for the young bluebirds when they first leave the box. It's a good idea to use a baffle on the post below the birdhouse; this prevents predators from entering the birdhouse and destroying the eggs and/or young.
It is recommended that bluebird houses be placed in pairs to minimize competition from the native tree swallow. The two boxes should be between 10 to 15 feet apart. Additional box pairs should be 100 yards away, distance enough to accommodate territories established by nesting pairs. Bluebird houses will also attract English sparrow and starlings; these intruders' nest should be removed as soon as they are found.
If bluebirds are common in your area, you may get nesting bluebirds the first year. If not, it may take a few seasons for them to find the bluebird house.