Platform and tray feeders: the widest species list, at a price

The short answer

• A platform tray reaches 28 of the 34 species in our dataset, more than any other design, because it imposes no perch, port or posture requirement at all.
• It also has the highest disease cost of any feeder: birds stand in the food, so droppings land in it. That is manageable only with a daily sweep.
• Put out a day's worth, not a week's. Start with two level cups of seed at dawn and adjust from what is left at dusk.
• A mesh floor is not a detail. Solid-bottomed trays hold water, and wet seed in an open tray is the fastest route to mold in the whole yard.
• A tray offers no squirrel resistance whatsoever. Either baffle the pole properly or decide in advance that you are feeding squirrels too.

A platform feeder is a flat surface with a rim. There is no port to squeeze seed through, no perch to balance on, no roof to duck under and no weight threshold to stay below. That absence of constraints is the entire proposition, and it makes the tray the most and least discriminating feeder you can own.

Twenty-eight of the 34 species in our dataset will use a platform. A hopper reaches 17, a tube reaches 12. Nothing else comes close, and nothing else costs as much to run properly.

What the open surface buys you#

The birds a tray adds are the ones a hanging feeder structurally cannot serve: the heavy ones, the ground-feeding ones and the ones that eat things which do not flow through a port.

• Top-tier favorite for: Mourning Dove, Dark-eyed Junco, White-throated Sparrow, Song Sparrow, House Sparrow, Red-winged Blackbird
• Eaten readily by: Eastern Towhee, Common Grackle
• Taken occasionally by: Northern Cardinal, House Finch, Purple Finch, European Starling

Doves, juncos, towhees and sparrows are the obvious gains. Less obvious are the birds that want foods no tube can dispense: fruit and jelly for robins and orioles, dried mealworms for bluebirds and wrens, whole in-shell peanuts for jays. On a tray, the food does not have to be seed-shaped.

The tray is also the only surface where a seed mix is defensible. Everywhere else, sorting birds flick unwanted grain out of a port and it lands in the grass. On a flat surface the sorting happens in place, and a bird that wants millet and a bird that wants sunflower can both be served from one fill. That is the case for white proso millet mixed with black oil, and it is the only case for mixes on this site.

A day's worth, not a week's#

This is the discipline that separates a tray that works from a tray that becomes a health hazard, and it is a portioning problem rather than a cleaning problem.

Our working figures for volume to weight: a level US cup of in-shell black oil sunflower comes out around 3 oz, and a level cup of white proso millet around 6 oz, because the millet packs far more densely. So "two cups" means something quite different depending on the fill, which is why the useful instruction is a routine rather than a quantity.

The calibration, over four days:

1. Day one, at dawn, put out two level cups. Note which seed.
2. At dusk, look. Empty by mid-morning, or still stocked at sunset? Sweep off whatever is left.
3. Day two, adjust by one cup up or down.
4. Repeat until the tray runs out roughly an hour before dusk. That is your portion.

Most suburban trays settle somewhere between one and four cups a day in winter and less than half that in summer. The number matters less than the shape of it: the tray should be empty, or nearly empty, when you go to bed. Seed left overnight feeds rats and mice, takes on dew, and is still there in the morning to be rained on.

Drainage: the floor decides everything#

A solid-bottomed tray with a rim is a shallow bowl. It rains, the bowl fills, and the seed sits in water until it swells, sours and grows mold. Drilling a few holes in a solid floor helps less than you would expect, because the holes clog with hulls within days and the flat panel still holds a film of water that never dries.

A mesh floor solves it properly. Water passes straight through, air moves under the seed, and the surface dries within an hour or two of rain stopping instead of a day or two.

Match the mesh to the smallest seed you intend to use. White proso millet is only about 2 mm across, so it pours straight through a 1/8 in grid; if millet is on the menu, you want window-screen-grade mesh instead. If you already own a solid tray, tip it after rain rather than waiting, and treat every wet fill as a fill to be thrown out. What grows in it is covered in moldy seed.

Height changes the guest list#

The same tray does different jobs at different heights, and the choice is about which birds you are short of.

• On the ground, or on legs under about 12 in. This is where juncos, white-throated sparrows, song sparrows, towhees and doves want to feed. These species largely will not use a hanging feeder, so a low tray is genuinely additive rather than duplicating your other feeders. The details of feeding at that level are in ground feeders.
• At 4 to 5 ft on a pole. Cardinals, jays, grosbeaks and finches, with much less exposure to cats and rodents, and a baffle position that actually works.
• Hung from a branch or hook. The worst of both: it swings, seed slides off in wind, and squirrels come down the hanger.

Covered or open#

A roof over a tray is a genuine trade rather than an upgrade.

Cover it if you are in a wet climate, you feed fruit, jelly, mealworms or suet dough, or you cannot get out to sweep every day. Keep the roof at least 8 to 10 in clear of the surface so larger birds can still get underneath.

Leave it open if you feed dry seed and you sweep daily. Sun and moving air are the cheapest disinfectant available, and an open surface dries after rain far faster than a covered one that traps humidity underneath. An open tray also keeps the approach clear for the heavy birds the design exists to serve.

The daily sweep, and the weekly wash#

A tray is the only common feeder that needs attention every day. The good news is that the daily part takes under a minute.

Daily, at dusk or first thing: brush the surface clear with a stiff hand brush, hulls, wet seed, droppings and all, onto the ground away from the feeder or into a bin. Tip the tray to shed water. Do not refill until it is dry.

Weekly, or every three to four days in heat or heavy traffic: lift the tray off, scrape it, and run the standard wash, disinfect and dry routine in how to clean a bird feeder. Dry it in the sun before it goes back out.

Immediately, at any time: if you see a bird sitting fluffed and lethargic at the tray, or with swollen or crusted eyes, take the tray out of service, clean it and leave it down for at least two weeks. A shared flat surface is the highest-risk feeder you own during an outbreak, and this is not a judgement call to postpone. Background in bird diseases at feeders.

Living with the squirrel problem#

There is no mechanism to fail here because there is no mechanism. A tray offers a squirrel a flat open plate of food and nothing else. That leaves two honest positions.

Defend it with geometry. A pole tray can be protected as well as any other feeder: smooth pole, baffle at about 4.5 ft, 7 to 10 ft of clear air on every side, nothing overhanging. Nothing about the tray itself changes this, which is the useful part. See baffles and poles for hardware and for working out the distances.

Or share it deliberately. A ground tray in squirrel country will be visited by squirrels, and fighting that is a losing project. Put out a small portion, sweep at dusk, and keep your sunflower on a protected pole feeder where it matters. This is often the calmer answer, and it is discussed alongside the other options in stopping squirrels.

What a tray must not become is an unmanaged pile of seed on the ground. That is the route to rodents, to seed waste and mess, and in bear country to a genuine safety problem. If you cannot commit to the daily sweep, run a hopper instead and add a small tray only in the months you are actually watching.

Frequently asked questions#

How much seed should I put on a platform feeder?

One day's worth. As a starting point, two level cups of seed put out at dawn. As a working figure a level cup of in-shell black oil sunflower runs about 3 oz and a cup of white proso millet about 6 oz, because the millet packs far more densely, so that is roughly 6 to 12 oz depending on the fill. Check at dusk. Empty by mid-morning means add a cup tomorrow; seed still sitting there at dusk means sweep it off and put out less. A tray is a plate, not a store.

Do platform feeders spread disease?

They carry the highest risk of the common designs, because birds stand on the same surface they eat from, so droppings land directly in the food. That is the transmission route for salmonellosis and other feeder-borne diseases. The risk is manageable but only with routine: sweep the tray clear every day, scrub and disinfect weekly, never let wet seed sit, and take the tray out of service entirely if you see a sick or lethargic bird or if your wildlife agency reports an outbreak locally.

Should a platform feeder have a roof?

In a wet climate or if you offer fruit, mealworms or suet dough, yes. For dry seed with a daily sweep, an open tray is better: sun and moving air dry the surface and dry surfaces are safer surfaces. A roof also lowers the approach ceiling, which pushes away the larger birds a tray exists to serve. If you add a cover, keep it at least 8 to 10 in above the tray so a jay or a dove can still get under it.

Can a platform feeder be squirrel-proof?

The tray cannot be, but the installation can. There is no mechanism, no port and no weight system in an open tray, so all of the defense comes from geometry: a smooth pole in open ground, a baffle at about 4.5 ft, and 7 to 10 ft of clear air on every side. On the ground, nothing will work, and a ground tray in squirrel country is simply a shared feeder. Feed a smaller portion, sweep it clean at dusk, and accept the arrangement.

How high should a tray feeder be?

It depends on which birds you are after. At ground level to about 12 in you get juncos, sparrows, towhees, doves and quail: the birds that will not use a hanging feeder at all. At 4 to 5 ft on a pole you get cardinals, jays, grosbeaks and finches, and you cut the exposure to cats and rodents considerably. Many yards run both, with a small portion on the ground and the main tray on a baffled pole.

What is the best seed for a tray feeder?

A tray is the one feeder where a mix genuinely makes sense, because birds can sort on the surface instead of flicking rejects out of a port. White proso millet plus black oil sunflower covers the ground-feeding birds and the perching birds at once. Cracked corn brings in doves and jays, and also starlings, grackles and rodents, so use it deliberately. Fruit and mealworms work on a tray and nowhere else on most feeders.

Sources and further reading

1. Types of Bird Feeders Cornell Lab of Ornithology, Project FeederWatch Tray feeder design and the breadth of species that use one
2. Sick Birds and Bird Diseases Cornell Lab of Ornithology, Project FeederWatch Why shared feeding surfaces raise transmission risk
3. Wildlife Health Bulletins USGS National Wildlife Health Center Agency guidance during wildlife disease events
4. Bird Feeding and Care National Audubon Society Feeding surfaces, placement and cover