Can chickens eat walnuts?
Walnuts are best avoided for chickens. They aren't a recognised toxic food for poultry the way chocolate or avocado skin is, but they're hard for a chicken to peck apart and digest, a choking risk in shell fragments, and — most importantly — mouldy walnuts can carry a toxin that is genuinely dangerous. Given how little nutritional benefit they offer a flock, the safer choice is simply not to feed them.
Picked for your pet
Johnson's Poultry Tonic
A 500ml multi-vitamin conditioning tonic for chickens and other poultry
£11.99
Johnson's Poultry Mite & Lice Powder
A 250g diatomaceous earth powder to keep bird housing dry and discourage red mite
£6.79
Johnson's Poultry Corn 'N' Grit Treat
A 270g corn and grit treat for poultry keepers, sold to help digestion
£3.85
Johnson's Poultry Apple Cider Vinegar Conditioner
Apple cider vinegar water conditioner for chickens, ducks, geese and other poultry
£6.99
Why walnuts don't earn their place
Walnuts are high in fat and hard in texture, neither of which suits a chicken's digestive system well, and shell fragments in particular are a genuine choking and internal injury risk for a bird pecking quickly at food on the ground. Unlike a soft fruit or vegetable treat, there's very little upside to offset that risk.
Chickens also don't need the fat and calorie density walnuts provide — their diet is built around a complete layer feed formulated specifically for their needs, and a rich, energy-dense treat like walnuts adds little beyond unnecessary calories.
The mould risk is the serious part
Walnuts, along with some other nuts, can develop a mould that produces tremorgenic mycotoxins if they're stored poorly or start to spoil — these are genuinely toxic and have been linked to serious neurological symptoms in animals that eat affected nuts. It's very difficult to tell a mouldy walnut apart from a safe one just by looking, which is part of why the safer approach is to avoid giving them at all.
This risk isn't unique to walnuts, but it's a good example of why an unfamiliar treat with real downsides and no meaningful upside for a chicken's health isn't worth the gamble, however harmless it might look on a plate.
What to do if a chicken has eaten some
If your flock has got into walnuts, watch closely for any sign of illness — wobbliness, tremors, lethargy or a bird that seems disorientated are all signs worth acting on quickly rather than monitoring at home. Contact a vet with poultry experience straight away if you see any of these, particularly if the nuts could have been mouldy or stored for some time.
A single nibble of a fresh, clearly sound walnut is unlikely to cause serious harm, but given how hard it is to be certain of a walnut's condition, treating any exposure as worth watching closely is the sensible approach rather than assuming it's fine.
Safer treats for a flock
A complete layer feed should remain the core of a flock's diet, with occasional treats like leafy greens, a little soft fruit, or mixed corn and forage blends offering variety without the risks that come with nuts. These give a flock something to peck through and enjoy without the mould and choking concerns walnuts carry.
If you want to give your chickens something to forage for, a proper poultry scatter or forage mix, built specifically for the purpose, is a far more reliable choice than reaching for whatever's left over from the kitchen, and won't carry the same storage and mould risks that dried nuts do over time, however carefully they've been kept.
More for your pet
Things we stock that owners commonly reach for here. Nothing on this page depends on you buying one.
Johnson's Poultry Housing Spray
An HSE-approved 250ml aerosol to kill mites, lice and fleas in poultry housing
£6.25
Supa Ringwood Poultry Feeder
A 2.5kg poultry feeder with a rain hat and raised legs, built for a small flock
£21.99
Supa Poultry & Bird Feeder
Gravity-fed 6kg feeder for poultry and game birds, stands on the ground or hangs
£14.99
Supa Poultry & Bird Drinker
A 6 litre gravity drinker for poultry, with a dome top birds cannot perch on
£9.99
Common questions
- Are walnuts poisonous to chickens?
- They're not classed as a directly toxic food, but they're a poor choice — hard to digest, a choking risk from shell fragments, and mouldy walnuts can carry a genuine toxin. The safest approach is simply not to feed them.
- What happens if my chicken eats a walnut?
- A single nibble of a fresh, sound walnut is unlikely to cause serious harm, but watch closely for any wobbliness, tremors or lethargy, and contact a vet with poultry experience straight away if you see any of these signs.
- Can chickens eat other nuts?
- Most nuts offer chickens little nutritional benefit relative to their fat content and choking risk, and mould-related toxins are a concern across several nut types, not just walnuts. It's generally simplest to avoid feeding nuts to a flock altogether.
- What treats are safe for chickens?
- Leafy greens, small amounts of soft fruit, and mixed corn or forage-style scatter feeds are all safer treat options that give a flock variety and something to peck at, without the risks that come with nuts like walnuts.
Related
Sources
Written against guidance published by UK veterinary and welfare organisations. Always confirm specifics with your own vet.
Written by Matt Garnett, who runs Giddy Pets and is a lifelong pet owner — not a vet. This is general information, not veterinary advice, and it cannot replace an examination by the vet who knows your animal. How we write these guides.