Backyard Problem-Solving

Window Bird Feeders: Which Ones Stay Up, and Which Birds Come

A suction-cup feeder on the glass gives the closest view of backyard birds you'll get, and it's safer for birds than a feeder a few yards from the window. How to choose one, make it stick, and what to fill it with.

7 min read · Updated 2026-10-27

Gear for this job

Equipment for this job

All three mount with suction cups on smooth exterior glass.

Window Feeders

Safe distances: On the glass or within 3 ft; otherwise more than 30 ft away
Common visitors: Chickadees, titmice, nuthatches, House Finches, cardinals, juncos
Best food: Sunflower hearts or black-oil sunflower
Suction cups: Clean glass, warm cups, replace when stiff
First visits: Often within 1–3 weeks

Why a feeder on the glass is safer

Window collisions kill hundreds of millions of birds in the US each year. Most happen when a bird flies at full speed toward a reflection of sky or trees. A feeder far enough from the house that birds never fly toward the window avoids that, and so does one close enough that a bird leaving it can't build up speed. The Cornell Lab recommends feeders either within 3 feet of the glass or more than 30 feet away.

A window feeder is the extreme version of the close option: it is on the glass. A bird that bumps the pane on take-off from a window feeder is moving slowly and is very rarely hurt. The middle distance, around 5 to 20 feet, is where collisions become serious.

If you also have big reflective windows elsewhere in the house, treat the outside of the glass with dot or line patterns no more than 2 inches apart. Single silhouettes don't work; birds fly around them.

Choosing a window feeder

Look for clear, UV-resistant acrylic or polycarbonate that won't cloud in a year of sun. A removable seed tray makes cleaning a five-minute job instead of a project. Drain holes in the tray are essential; seed sitting in rainwater turns into mould within days.

A small roof keeps seed drier and gives birds some cover. Some models add a water dish, which works well in spring and fall but freezes in winter. Two suction cups are the minimum; three spread the load better and keep the feeder from rocking when a heavier bird such as a cardinal or a Blue Jay lands on the edge.

Size matters less than people expect. A tray that holds a cup or two of seed is plenty. Small amounts refilled often stay fresher than a big load that sits for a week.

Making the suction cups hold

A feeder that falls off is the number one complaint. It is almost always fixable.

Clean the outside of the glass with rubbing alcohol or vinegar and let it dry. Dust and film break the seal.
Warm the cups in hot water before pressing them on. Cold cups are stiff, which is why feeders fall in fall and winter.
Press from the center out to push all the air out. Let the feeder sit empty for an hour before loading it.
Use smooth glass. Textured, frosted, low-E coated exterior surfaces and screens don't hold suction well.
Every few months, remove the cups, wash them in warm soapy water and refit. Replace cups that have hardened or yellowed.

What to put in it and who comes

Sunflower hearts are ideal: everything that visits a window feeder eats them, and there are no shells to drop on the sill. Black-oil sunflower in the shell is cheaper and works as well, but expect hulls. Safflower is a good choice if grackles or squirrels find the feeder, and cardinals love it.

The usual visitors are the bold feeder regulars: Black-capped or Carolina Chickadees, Tufted Titmice, White-breasted and Red-breasted Nuthatches, House Finches, Northern Cardinals, and in winter Dark-eyed Juncos. Chickadees are almost always first. Ground-feeding sparrows and doves visit less, and some birds never come to glass at all.

If nothing arrives after a few weeks, check that the feeder is visible from a tree or shrub and that there is a feeder elsewhere in the yard to draw birds in. Putting a little seed on the sill below helps birds find it.

Squirrels, cats and cleaning

Mount the feeder high on the pane and well away from sills, railings and gutters a squirrel could jump from, roughly 5 feet or more. If cats sit on the sill outside, move the feeder up or to another window; a feeder at cat-ambush height does more harm than good.

Clean it every week or two. Tip out old seed, wash the tray in hot soapy water, rinse with a weak bleach solution (1 part bleach to 9 parts water) if it is mouldy, and dry it before refilling. Clean the glass behind it at the same time; droppings on the window are easier to remove when they are fresh.

Frequently asked

Do window bird feeders cause birds to hit the window?

No. Feeders on the glass or within 3 feet reduce serious collisions because birds can't gain speed. The risky distance is roughly 5 to 20 feet away.

Why does my window feeder keep falling off?

Dirty glass and cold, stiff suction cups. Clean the glass with alcohol, warm the cups in hot water, press from the center and let it set before loading.

What birds come to window feeders?

Chickadees, titmice, nuthatches, House Finches, cardinals and in winter juncos. Chickadees usually arrive first.

What seed should I use in a window feeder?

Sunflower hearts leave no mess. Black-oil sunflower is cheaper; safflower suits cardinals and puts off grackles.

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