Mount nesting boxes four feet or more from the ground, preferably on smooth pipes or posts. Mount boxes so that the entrance hole faces a tree or shrub. This allows the young bluebirds to fly directly to a branch when they leave the nesting box. This will keep them off the ground, away from predators. Boxes should be spaced at least 100 yards apart.
Bluebirds are territorial and don t want other birds any closer.
Protect boxes against snakes, raccoons, feral cats and other predators. Monitor the boxes, if possible, at least once a week during the nesting season. Always remove house sparrow nests immediately. Inspect boxes in late winter. Clean and repair, if necessary.