Bluebirds are different in a way that trips up backyard birders who treat them like finches: they hunt insects, and a feeder full of sunflower hearts rings no bell for them. Switch the offering to mealworms, match the feeder to the bird, and the visitors show up — often within days of the first warm spell.
The catch is that “mealworm feeder” covers a lot of ground, and the wrong one either leaks worms onto the lawn or hands your supply to starlings. Below is the setup that the North American Bluebird Society’s own mealworm guidance describes, along with the start-up trick that gets birds to notice the feeder in the first place.
What Kind of Feeder Attracts Bluebirds?
A hopper-style feeder is the type bluebird guidance names as the best choice, and it works because bluebirds enter through a hole at either end rather than perching on an open tray.
Those entry holes do double duty. Sized at 1½ inches or 1 9/16 inches, they let a bluebird in while shutting out larger birds that would otherwise clean the feeder out in an afternoon. A cage-style feeder — an inner food compartment wrapped in a wider wire cage — accomplishes the same thing by geometry instead of hole size, and either approach is a valid way to keep the guest list short.
Whatever you choose, the food itself is the non-negotiable part. Live or dried mealworms are the attractant. Skip the seed blend entirely for this purpose; it draws house sparrows and grackles, which is the opposite of what you want near a bluebird box.
Why Do Mealworms Escape and How Do You Stop Them?
Mealworms crawl, so the dish matters as much as the feeder. A shallow dish with smooth, steep sides keeps them contained; a cat food can, a tuna can, or a small glass or ceramic dish all fit the bill.
Terra cotta and textured plastic trays are the wrong pick — worms climb the rough surface and end up in the grass below, where they’re wasted. If your feeder has an open tray on top, treat that as a teaching tool rather than a permanent feeding station, and expect a few escapees until the birds learn the routine.
| Setup Choice | What It Does | Watch Out For |
|---|---|---|
| Hopper feeder, 1½” end holes | Bluebirds enter from either end; large birds blocked | Holes cut larger than spec defeat the purpose |
| Cage-style feeder | Wire cage excludes bigger birds by size | Some designs make refilling fussy |
| Flat saucer on top | Teaches birds where the food is during week one | Worms crawl out if the dish sits level and exposed |
| Cat food or tuna can | Smooth sides hold mealworms in place | Shallow — dries out fast in sun |
| Glass or ceramic dish | Smooth, easy to clean, worm-proof | Breaks if it falls off the feeder |
| Seed blend | Attracts sparrows, finches, grackles | Not a bluebird food — wasted money |
| Live mealworms | Strongest response from bluebirds | Need cool storage; die in heat |
| Dried mealworms | Cheaper, shelf-stable, still accepted | Some birds ignore them until rehydrated |
How Do You Get Bluebirds to Find a New Feeder?
Start by placing a few mealworms in a flat saucer or shallow dish on top of the feeder, outside the entry holes, so passing birds see food without having to solve the feeder first. Once they’re eating from the saucer, move the worms inside the feeder and the habit carries over.
Location matters just as much as the food. Starting at the far end of the yard and waiting is the mistake that stalls the whole project — put the food where bluebirds already perch, then move it.
If you’re comparing models before you commit, the bluebird feeders our team tested covers entry-hole sizing, cage designs, and which builds hold up through a wet spring.
How Often Should You Feed Mealworms?
Offer mealworms in limited quantities, usually once or twice a day. Overfeeding trains birds to depend on the feeder and leaves uneaten worms to die in the tray.
Bad weather is the exception. During cold snaps, heavy rain, or a late-season freeze, more frequent feeding helps birds through a stretch when natural insect supplies vanish. That’s the one time to fill the dish more than twice in a day.
The North American Bluebird Society’s mealworm fact sheet is the source behind the feeder type, hole sizing, and the saucer first, feeder later method described here. Their material applies specifically to bluebirds, so if your yard mostly draws house sparrows, the same setup won’t change that — different birds need different arrangements.
FAQs
Will bluebirds eat from a seed feeder?
Rarely, and not reliably. Bluebirds forage for insects and berries rather than seeds, so a standard seed tube mostly draws finches, sparrows, and grackles. If you want bluebirds at a feeder, mealworms are the food that works, offered in a dish or hopper rather than mixed into a seed blend.
Do dried mealworms work as well as live ones?
They work, though live worms draw a faster, stronger response. Dried mealworms cost less, store on a shelf, and last far longer. Some bluebirds ignore them at first, so soaking dried worms in water for a few minutes before offering them can help close the gap with live bait.
How long before bluebirds find a new feeder?
It varies with how many bluebirds already visit your yard. If they’re nesting nearby, the saucer trick often works within days. A yard with no bluebird activity can take weeks or a full season, since you’re waiting for birds to move through and notice the food.
References & Sources
- North American Bluebird Society. “NABS Factsheet — Mealworms” Source for hopper feeder type, 1½-inch and 1 9/16-inch hole sizing, smooth-sided dishes, and the saucer start-up method.
- North American Bluebird Society. “Mealworms Factsheet (Draft)” Supports feeding frequency guidance of once or twice daily, with more frequent feeding in poor weather.
- Virginia Bluebird Society. “Nest Box Trail Statistics” Background on bluebird nesting and trail activity in the Mid-Atlantic region.