Peanuts for birds

Peanuts are the highest-energy food most people put in a backyard feeder, and one of the few that brings woodpeckers, nuthatches, chickadees and jays to the same spot. They are also, by a distance, the most squirrel-attractive thing you can buy.

This page is about the food: which form to buy, which bag, what to avoid, and how to store it. The feeder that holds it is a separate decision, covered in our peanut feeder guide.

Two products, two different birds

The word “peanuts” covers two foods that behave nothing alike, and buying the wrong one is the usual mistake.

FeederWatch describes the split the same way: larger birds like jays may grab several peanuts at a time and fly off to hide them for later, while smaller birds like chickadees, nuthatches and titmice have more success on shelled peanuts. If you want small birds at a peanut feeder, buy pieces. If you want the spectacle of jays queueing on a tray, buy shells.

How we chose these

On published listing specifications — weight, form, stated contents and the maker's own feeder guidance — checked against live listings in September 2026 so that every pick was purchasable. No testing claim: we have not run peanut trials, and nobody sensibly could across the species involved. We weighted, in order: whether the bag states plainly what is in it; the form, because that decides which birds benefit; the size against a realistic rate of use, since high-fat food spoils; and price per pound of actually edible food, which is where in-shell nuts look worse than they first appear. Our full criteria are here.

The rule that matters more than the brand

Peanuts are the food on this site with the clearest safety rule attached, and it is worth stating before any product recommendation.

Nothing salted, coated or flavored. FeederWatch's guidance is to offer raw or roasted peanuts but to avoid salted peanuts or peanuts that have been roasted with any coatings or flavorings. That rules out most of the supermarket snack aisle, however good the price looks.

And nothing moldy, ever. FeederWatch tells readers to keep an eye out for any signs of mold on peanut products and to dispose of moldy peanut hearts immediately. Peanuts are particularly prone to it when damp, and this is not a case for picking out the bad ones. If a batch has gone, the batch goes.

In practice that means peanuts are the food that most rewards good storage — a sealed container in a dry place, and a feeder you empty rather than top up. Keeping food dry in the feeder is half of it; keeping the bag dry is the other half.

The squirrel arithmetic

There is no polite way to put this: if you put peanuts out on an unbaffled feeder, you have bought squirrel food. Peanuts are more attractive to squirrels than sunflower, and shelled pieces most of all, because there is no shell to work through.

Two honest strategies exist, and they point in opposite directions.

• Defend the feeder. A weight-closing mesh nut feeder on a baffled pole, sited to the 5-7-9 rule. This is the setup that works, and our squirrel-resistant feeder picks explain why the mechanism matters more than the mesh.
• Feed the squirrels deliberately, away from the birds. Pennington's own listing suggests using in-shell peanuts on the ground to keep squirrels away from feeders. It is a real tactic and it does reduce raiding, but be clear about what you are doing: you are running a squirrel feeding program, and the population in your yard will respond accordingly. Our position on decoy feeding has not changed — it works better as a distraction than as a solution.

What does not work is buying a peanut feeder described as squirrel proof and hanging it from a branch.

Sizing the bag

Peanuts are high in fat, and high-fat foods go rancid. That is the whole sizing argument.

A 5 lb bag suits one feeder and a modest jay habit. Ten pounds suits a yard running a peanut feeder year-round. Fifteen pounds only makes sense if peanuts are a staple in your setup and you have sealed, cool storage — otherwise the last third of the bag is a liability rather than a saving. The arithmetic is the same one we run for seed in buying bird seed in bulk: cost per pound eaten, not cost per pound bought.

How to serve each form

The form you buy decides the feeder, and getting this pairing wrong is the most common reason a bag of peanuts sits unused in a garage.

Mesh matters more than it looks. A mesh sized for shelled pieces lets birds work a nut loose gradually, which is what keeps nuthatches and woodpeckers at the feeder for minutes at a time rather than seconds. Mesh sized too large hands over whole pieces, and a jay empties it in one visit.

The other serving decision is quantity. Put out days' worth of peanuts and you are running a squirrel program; put out what the birds clear in a day and you are feeding birds. Small and often beats large and occasional here more than with any other food, which is also the honest argument against the biggest bags.

Storing them properly

Peanuts are the feeder food most likely to go wrong in storage, for two connected reasons: they are high in fat, and they mold readily when damp.

The fat is why they go rancid. An opened bag in a warm garage over summer will smell faintly of old cooking oil within weeks, and birds refuse it — the food has not become dangerous, only worthless. Shelled pieces turn faster than whole nuts, because there is no shell protecting the kernel.

The mold is the serious half. FeederWatch's instruction is to watch for any sign of mold on peanut products and dispose of them immediately, and that is the standard we apply: no picking through, no drying out, no putting it on the ground because it seems wasteful. A container that keeps damp air out does most of the work here, and the rules are the same ones we set out for seed — sealed, rigid, cool and dark.

In the feeder, the equivalent discipline is emptying rather than topping up. Peanut feeders trap crumbs and dust at the bottom, that residue stays damp, and topping fresh nuts onto it is how a feeder grows mold while looking fine from the window. Empty it, wash it, dry it, refill it — on the same schedule as everything else.

Where peanuts fit in a setup

Peanuts are an addition, not a foundation. The foundation is black-oil sunflower in a tube or hopper, because it feeds the widest range of birds for the least money — our seed picks explain why. Peanuts earn their place when you want the specific species they bring: woodpeckers that will not use a small perch, nuthatches working head-first down a mesh tube, jays that turn up within a day of the first nut going out.

Cold weather is when they matter most. Fat and protein are what birds are short of in winter, which is the same reason suet belongs in a winter setup. In hot weather, cut back: high-fat foods spoil fastest exactly when you are least likely to notice.

Telling when a bag has turned

Peanuts give you clear warnings, and learning them takes one inspection rather than a season of trial and error. Tip a handful into your palm before each refill and check three things.

Smell. Fresh peanuts smell faintly sweet and nutty, or of almost nothing. Rancid ones smell of old oil or paint. Rancid nuts are a waste rather than a hazard — birds simply refuse them — but there is no reviving them.

Appearance. Look for any dusting of gray, green or black, particularly in the folds of a shell or the crevices of a broken piece. That is the finding that ends the discussion: mold means the batch goes, not the visible pieces.

Feel. Kernels should be firm and snap. Soft, bendy or slightly tacky pieces have taken on moisture, which is the step before mold. If a bag has reached that stage, stop putting it out and check where it was stored, because the storage is the cause rather than the bag.

The same inspection applies to the feeder, not just the bag. Peanut feeders hold damp crumbs at the bottom long after the visible nuts look fine, and that residue is where trouble starts. If you inherit a feeder that has been hanging for months, empty and wash it before you trust it.

Which birds you can expect, and when

Peanuts have the fastest response time of any food on this site. Where the birds are already present, a peanut feeder is usually found within days rather than the weeks a new seed feeder can take.

Jays first, almost always. They are bold, they are watching your yard already, and in-shell nuts are exactly what they are built to carry off — FeederWatch notes they may take several at a time and fly off to cache them. Woodpeckers follow: downies and hairies work a mesh feeder steadily, and a red-bellied will dominate one while it is there. Nuthatches and titmice come for pieces and take single fragments away to wedge in bark. Chickadees do the same, more nervously.

What you will not get is finches, doves or sparrows, which have no use for a peanut. That is worth saying because it affects the decision: peanuts widen the range of birds at the top end and do nothing for the small seed-eaters already at your tube feeder. If your yard is all finches, nyjer is the food that changes things, not peanuts.

Peanut butter, briefly

It comes up every time peanuts do. Plain peanut butter, smeared into bark crevices or a purpose-made holder, is taken readily by woodpeckers, nuthatches and chickadees. Use plain, unsweetened, unsalted butter, and keep it out of hot weather for the same reason you take plain suet down in summer — soft fat on feathers is a genuine problem rather than an aesthetic one. Our feeder page covers the holders.

What we would buy

• First peanut purchase, small birds wanted: a 10 lb bag of shelled pieces and a weight-closing mesh feeder on a baffled pole.
• You want jays: a 5 lb bag of in-shell nuts on a tray, and the acceptance that squirrels will share.
• Peanuts are a staple in your yard: the 15 lb pieces, in a sealed container, used inside a few months.
• Squirrels have already won: stop buying peanuts until the baffle is up. No other change helps.

Used well, peanuts are the most rewarding thing in the shed: they bring in the birds people most want to see, and they do it quickly. Used badly, they are an expensive way to run a squirrel buffet with a bird feeder attached.