The first bluebird flying across your yard makes you wonder how you can bring them back tomorrow. Bluebirds do not ask for much. However, they do require shelter, food, water, and open space before they decide to stay.
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Provide nesting sites, hunting grounds, natural food, and protection from predators, and bluebirds will come to stay. With a bit of work and thought, you can convert your plain lawn and garden into a space where bluebirds will raise young and return year after year.
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1) Start With the Right Nest Box
The most important thing you can provide is a properly sized nest box. For Eastern Bluebird (Sialia sialis) and Western Bluebird (Sialia mexicana), look for boxes with 1½-inch round entry holes. This size opening allows starlings to be excluded, but enables bluebirds to enter. The same size openings are used for boxes for Mountain Bluebird (Sialia currucoides).
Position the box so that it is 4 to 6 feet above ground, preferably in an area where there is short grass. Bluebirds hunt insects that are on the ground, which is why they prefer open spaces rather than areas that are heavily shaded or have lots of plants. If you can, try to position the box so that the entrance hole faces away from the direction that the wind is coming from.
Use untreated wood, and forgo the perch. Blue birds don’t need one, and it gives predatory birds an advantage. Include small vent holes at the top, and a hole on the bottom for drainage to keep things dry between rains.
A common mistake is placing the box too close to feeder boxes or high-traffic areas. Check once per week during nesting season, keep quiet, and let the birds do the rest.
2) Pairing Boxes: The Tree Swallow Strategy
House sparrows are relentless, and one well-placed open-front box can draw their focus away from bluebird setups. Tree swallows compete with sparrows for nesting sites. When swallows are provided a shallow, open-front box, they’ll move in and effectively occupy the area that house sparrows would otherwise target.
Place open-front boxes at 5-6 feet high, with a distance of 10-25 feet from bluebird boxes. Position the box toward the open sky, avoiding thick shrubs. Swallows prefer sites near water, although they’ll nest without a pond close by.
Do not put it near any structures or active bird feeders where sparrows hang out. This will defeat the purpose of your feeder.
3) A Low Platform Feeder Loaded With Mealworms
Position it 3 to 5 feet high in an open area of your yard. Eastern, Western, and Mountain Bluebirds like to have clear lines of sight so they can see any predators that might be nearby while they are eating. Make sure not to put any shrubs too close to the feeder.
Provide dried or live mealworms in an open, shallow dish so that they can drain. Bluebirds eat insects, especially during the nesting season when they are constantly feeding the nestlings. Put out a small amount each morning to keep the food fresh and avoid attracting ants.
Nearby tube feeders and crowded seed stations are also a concern. House sparrows and starlings dominate those setups and will push bluebirds out before they can even get comfortable. Make sure the mealworm feeder is separate and calm.
Position the feeder so that it is in sight of a fence post or other low perch. Bluebirds like to watch from above before they land, so you should try to pick a good place. Also, try to put out the mealworms at the same time every morning; they learn routines very quickly.
A single pair of Eastern Bluebirds can deliver food to nestlings up to 15 times per hour during peak feeding periods. That adds up to hundreds of insects caught per day, which means a well-stocked yard with open hunting ground isn’t just a convenience for bluebirds. It’s a real competitive advantage for successfully raising a brood.
4) Native Berry Shrubs Make a Difference Year-Round
From late spring to early summer, Serviceberry (amelanchier) produces soft, small berries that attract bluebirds. During this time, bluebird parents feed their young. The berries add to their diet, and bluebirds will stick around even after the insects die off.
Pick a species that is native to your area and will grow in full sun to light shade. Be mindful of the height of the species; wide varieties reach 10 to 20 feet. Do not plant the species too close to a feeder pole or nest box; bluebirds prefer open space to monitor feeding areas.
The biggest mistake is purchasing a non-native ornamental that has berries that may look appealing, but are ignored by birds. Go for native amelanchier from a local native plant nursery, not a large big box store that sells whatever is trending.
Bluebird resources create habitat for birds for years to come. Native plants are low-maintenance after establishment due to self-sustenance.
5) Short Grass Is Hunting Habitat, Not Just Lawn
Bluebird hunting strategies are described as: perch high, scan low, and drop quickly. Tall grass disrupts this process by obstructing a bird’s view of the ground.
Your grass does not have to be a uniform short height. Open areas can be more variable and paired with perch points to maximize hunting effectiveness. Visible ground and elevated perches are key.
The heavy use of pesticides is a problem for bluebirds, as it reduces the insect prey availability, and can persist in the prey available for birds that are then eaten. Bluebirds prefer bug activity and thank you for it.
“A perfectly manicured, pesticide-treated lawn is essentially a food desert for bluebirds. A slightly imperfect one is a hunting ground.”
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6) Moving Water Gets Their Attention Faster Than Still Water
Bluebirds prefer water that is shallow so they can confidently wade in. Ensure the deepest point is 1-2 inches with a gentle slope. Steep, slick walls can be ignored.
You can install a small dripper or bubbler. Moving water is more likely to attract birds than still water and stays cleaner longer between changes. For this, a solar bubbler is perfect. No hoses or power sources are needed.
Placement is as important as the bath itself. Position the bath in an open space where it can be seen and is far away from dense shrubs where cats may be hiding. If the weather is warm, make sure to change the water daily. This is important because if the water is stagnant, the birds will not be attracted to the bath.
7) Predator Guards Are Non-Negotiable
Raccoons, snakes, and outdoor cats can reach an unprotected nest box in minutes. A cone-shaped guard or wide stovepipe baffle mounted on the pole below the box stops them cold. This is true regardless of which bluebird species you’re hosting.
The metal pole matters. Mount the guard on a smooth metal pole, NOT a wooden post or tree, as predators can climb those surfaces, even when the box sits several feet above. Place the baffle 4 to 5 feet off the ground with the box above it. It should be able to wobble under enough pressure so that a climbing animal cannot brace against it long enough to push past.
Check the guard before nesting season to see that it is still secure, and that nothing nearby (a branch, a fence rail, a garden bench, etc.) gives the predators a jumping point past the guard.
8) Put Down the Pesticides and Pick Up the Pests Instead
Broad-spectrum pesticides do not just kill the pest you’re targeting. They kill the entire insect population that bluebirds depend on, and they can persist within the insects that birds capture and feed to their young. This is one of the easier things to change and also one of the most impactful.
Walk your garden every few days to pick larger pests such as caterpillars or beetles, and drop them in soapy water. For smaller outbreaks, neem oil sprayed in the evening works well without the collateral damage when bees are less active, and birds have typically finished their evening feeding rounds.
Do not treat the entire yard. This habit eliminates beneficial and neutral insects as well as the problem insects. Bluebirds require a reliable and consistent supply of natural prey, and a yard that has been completely sprayed goes quiet in ways that you notice after the birds do.
Start small by checking single plants, taking away what you can see, and leaving the rest of the yard untouched. Once you realize you are working with the birds instead of against them, it becomes a surprisingly satisfying shift.
Understanding Bluebird Behavior
Bluebirds have clear seasonal patterns, and nest site selection is also purposeful. Knowing those patterns means you can stop guesswork when it comes to timing and set up, and start making choices that are in sync with what the birds are doing.
Seasonal Patterns to Watch For
Eastern Bluebirds (Sialia sialis) often start nesting site selection in late winter, and in warmer regions, as early as February. Western Bluebirds (Sialia mexicana) and Mountain Bluebirds (Sialia currucoides) nest site selection occurs in similar time frames, depending on climate and elevation.
In early spring, the males establish their territory and take up perches in conspicuous locations. These locations can be fence posts, low-hanging branches, or even right atop your bluebird boxes. They signal that nesting season is starting by calling softly and repeatedly.
In warmer areas, bluebirds may be able to raise three broods in a year. Most bluebird pairs will raise two per year. In spring and early summer, activity is abundant, but it will quiet down as the young birds from the later broods disperse to the surroundings.
The most common timing error is putting up the boxes too late. Make sure to install and clean boxes by late winter so the returning birds find them ready. A good rule of thumb is to set up the boxes before you see the first bluebird of the year on your fence.
How Bluebirds Choose Nesting Spots
Bluebirds prefer open areas with short grass as well as scattered trees. They like to perch high and then drop quickly to the ground to hunt, so they prefer open areas like meadows and fields over yards.
As long as some open ground remains, Eastern Bluebirds are adaptable to suburban environments. On the other hand, Western and Mountain Bluebirds prefer rural or agricultural environments, with less construction and foot traffic nearby.
For cavity evaluations, they check for specific entrance diameter; about 1.5 inches for Eastern and Western Bluebirds, and a little larger for Mountain Bluebirds. The box needs to be placed 4 to 6 feet above ground and facing an open space, not a wall of brush.
In spacing, beginners make the same mistake every time. Bluebirds will actively defend their territory and will fight to the death close-by opposing pairs if boxes are set less than 100 yards apart. One box on an open yard edge fence line that is monitored consistently, will out perform three boxes that are in close proximity every time.
Being in the same family as American Robins and Hermit Thrushes means Bluebirds are also thrushes. That familial connection explains foraging style: the perch-scan-drop hunting behavior is characteristic of all thrushes, which is also why open ground is especially important for bluebirds.
Troubleshooting Common Challenges
Bluebirds have specific requirements for nesting boxes, and slight modifications usually address the most frequent concerns. Most challenges can be attributed to either competitor birds overtaking the boxes or the box being placed in a new location and not being sufficiently noticed yet.
Keeping Other Birds From Taking Over
House sparrows and European starlings will attempt to claim bluebird boxes before bluebirds ever arrive. These invasive species can both outcompete and physically harm nesting bluebirds, and they are extremely tenacious.
Box design is your first line of defense. Eastern and Western Bluebirds have a 1 ½-inch entrance hole, and for Mountain Bluebird territory, 1 9/16 inch. No perch. Bluebirds won’t use the box if it has a perch, whereas house sparrows will.
During nesting season, check the boxes regularly. House sparrow nests are easy to identify – they consist of dense, coarse grass and usually fill the entire box quickly. Be the first to remove any nesting materials to prevent eggs from being laid. This will require the most effort from you.
Even with proper box design, placement matters. Try to avoid areas with dense shrubs where house sparrows nest. Bluebirds have a preference for open areas with short grass, and will have less competition from the house sparrows there.
Finally, if all of this fails, consider moving the box 50 to 100 feet further out into an open area and checking again in the first season.
What to Do If You Don’t See Bluebirds Right Away
It’s quite normal for a brand new nest box to go unnoticed by bluebirds for weeks or even an entire season. Just because they haven’t found it, doesn’t mean you’ve made a mistake.
During wait, make sure you have all three basics: open space for the birds to hunt for insects, a ready clean nesting box, and a perch nearby like a low fence or branch. If you’ve used broad pesticides, that works against you, as it inhibits the insect life and attracts the birds.
When it comes to installing nesting boxes, do not crowd multiple boxes together unless you are deliberately pairing boxes 5 to 15 feet apart to discourage house sparrows from settling. Otherwise, boxes should be placed approximately 100 yards apart. Try to resist the impulse to keep moving nesting boxes. Bluebirds prefer stable, quiet areas.
Keep the box up year-round. Clean it out after each brood, leave it in place through winter, and let it age a little. A box that’s been up for two seasons and shows some weathering reads as safer and more established to scouting birds than one that went up last weekend.
The bluebirds are out there. They just need to decide your yard is worth the investment.
