How to Attract Bluebirds to Your Yard

Bluebirds are the birds that make non-birders stop and stare. That flash of vivid blue against a green lawn is striking enough to make anyone pause. Eastern Bluebirds, Western Bluebirds, and Mountain Bluebirds are all cavity nesters that readily use human-provided nest boxes, which means attracting them is more straightforward than you might expect.

Here is what bluebirds need and how to provide it.

Put Up a Nest Box

The single most effective thing you can do to attract bluebirds is install a properly designed nest box.

Bluebirds are secondary cavity nesters, meaning they use holes made by woodpeckers or natural tree cavities rather than excavating their own. As old trees with natural cavities become scarce, bluebirds have become increasingly dependent on nest boxes.

Box Specifications

The North American Bluebird Society recommends a box with a floor measuring roughly 5 by 5 inches, a depth of 8 to 12 inches from the entry hole to the floor, and a round entry hole 1.5 inches in diameter.

This hole size admits bluebirds but excludes larger cavity-nesting competitors like starlings.

The box should have ventilation holes near the top, drainage holes in the floor, and a side or front panel that opens for monitoring and cleaning. Do not use a box with a perch below the entry hole. Bluebirds do not need a perch, and it gives house sparrows a foothold to harass nesting bluebirds.

Placement

Mount the box on a pole 4 to 6 feet off the ground in an open area with short grass.

Bluebirds hunt insects by watching the ground from a perch and swooping down, so they prefer open habitats with clear sight lines. Face the entry hole away from prevailing winds and away from the afternoon sun.

If you have room for multiple boxes, space them 100 to 300 feet apart. Bluebirds are territorial and will not nest too close to another bluebird pair. Pairing boxes (two boxes 15 to 20 feet apart) can work because bluebirds will use one and tree swallows will often use the other, reducing competition.

Provide the Right Food

Bluebirds eat primarily insects during spring and summer and shift to berries and fruit in fall and winter. They do not eat seeds from feeders the way chickadees and finches do, so a standard bird feeder will not attract them.

Mealworms

Live mealworms are the most effective bluebird food. Place them in a shallow dish or a specialized mealworm feeder with smooth sides that prevent the worms from climbing out.

Start with a small amount and increase as bluebirds discover the source. Once they learn where the mealworms are, they will visit reliably.

Dried mealworms work as an alternative but are less attractive to bluebirds than live ones. Soaking dried mealworms in warm water for a few minutes before offering them makes them more appealing.

Berry-Producing Plants

Planting native berry-producing shrubs and trees provides natural food that attracts bluebirds year-round.

Dogwood, holly, elderberry, sumac, juniper, and serviceberry are all excellent choices. These plants also attract the insects that bluebirds eat during breeding season, providing a double benefit.

Add Water

A birdbath with moving water is a powerful attractant for bluebirds and many other species. Moving water catches their attention from a distance. A simple dripper or small fountain attachment turns a standard birdbath into a bird magnet.

Keep the water clean and fresh, changing it every few days in warm weather to prevent mosquito breeding.

In winter, a heated birdbath provides open water when natural sources are frozen, which is a major draw for bluebirds that overwinter in your area.

Manage Your Habitat

Bluebirds prefer open, park-like landscapes. A manicured lawn surrounded by scattered trees is close to ideal bluebird habitat.

If your yard is heavily wooded or densely landscaped, bluebirds are less likely to use it because they need open ground for hunting.

Reduce or eliminate pesticide use. Bluebirds eat insects, and pesticides kill the food supply they depend on. A yard with healthy insect populations is naturally attractive to bluebirds and dozens of other insect-eating species.

Deal with House Sparrows

House sparrows are the number one threat to nesting bluebirds. They will enter bluebird nest boxes, destroy eggs, kill nestlings, and sometimes kill adult bluebirds. If house sparrows are present in your area, monitoring your nest boxes is essential.

Check boxes weekly during nesting season. House sparrow nests are messy assemblages of grass, feathers, and trash. Bluebird nests are neat cups of fine grass or pine needles. If you find a house sparrow nest in a bluebird box, remove it immediately. House sparrows are not protected by the Migratory Bird Treaty Act, so removing their nests is legal.

Placing boxes away from buildings and in open areas reduces house sparrow pressure because sparrows prefer to nest near human structures. The farther your box is from a barn, shed, or house, the less likely sparrows are to claim it.

Be Patient

Bluebirds may not find your nest box in the first season. It can take a year or two for local birds to discover and investigate a new box. Keep the box clean and maintained, provide food and water, and be patient. Once a pair nests successfully, they often return to the same box year after year, and their offspring may nest in nearby boxes, building a local population over time.

There are few things more rewarding in backyard birding than watching a pair of bluebirds raise a family in a box you provided. The vivid blue plumage, the dedicated parenting, and the sight of fledglings taking their first flight make every bit of effort worthwhile.