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Placing one or two boxes around your home or developing a nest box trail will assist bluebirds by increasing nesting opportunities. Bluebird trails are made up of five or more boxes placed along roadways, fence lines or field borders. Boxes are placed four to six feet above ground and should have 100 yards between them. Entrances should face north, east or northeast to reduce exposure to spring storms and overheating from sunlight entering the hole.
All nesting structures should have predator guards. New boxes should be in place and old ones cleaned out by the first week of March. Early cleaning and maintenance will have boxes ready for the earliest of arrivals in mid March.
When you notice that the young bluebirds have left the nest, you should remove old nest material. Removing old nests will increase your chance of having the box used to produce a second brood within the same year.
Often bluebirds have competition for nesting cavities, especially from tree swallows and house wrens. Reducing tree swallow competition is accomplished by pairing boxes within 25 feet of each other and then spacing the next group 100 yards away. Pairing of boxes allows a breeding pair of tree swallows to use one box and leaves one available for bluebirds. Established tree swallows will
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