Can Chickens Eat Acorns? What You Need to Know

Acorns on a Tree Branch (image by pasja1000, Pixabay)

Article Summary

  • Acorns provide nutritional benefits, including protein, healthy fats, fiber, and various minerals, but the main concern is tannins, which can be toxic in large doses.
  • Signs of tannin poisoning in chickens include lethargy, decreased appetite, weight loss, diarrhea, and dehydration.
  • Acorns should be fed in limited amounts, 2-3 times per week at most, and should not constitute the main food source for chickens.

Chickens are natural foragers that enjoy a diverse diet. As fall approaches, acorns start raining down from oak trees. This leads chicken keepers to wonder – can chickens eat acorns? The short answer is yes, chickens can eat acorns in moderation as part of a balanced diet. However, acorns do contain tannins that can be toxic in large doses. Read on to learn more about the benefits and potential risks of feeding chickens acorns.

Is it Safe for Chickens to Eat Acorns?

Acorns can be a nutritious supplement for backyard chickens. In small amounts, acorns provide protein, fat, and minerals like calcium, phosphorus, and potassium. The main concern is tannins. All acorns contain tannins, which give them their bitter taste. Tannins help protect acorn seeds from predators. In humans, tannins can cause nausea, stomach upset, and constipation when consumed in excess. The same is true for chickens.

As long as chickens eat acorns in moderation, tannins are not an issue. In fact, tannins may even have some health benefits when consumed in normal amounts. Tannins are antioxidant compounds that can combat disease and inflammation. Just don’t let your flock overindulge. Too many acorns can be toxic.

Are Acorns Toxic to Chickens?

While acorns themselves are not poisonous, they do contain tannins which can cause toxicity if consumed in excess. The level of tannins varies by oak species. In general, white oak acorns are lower in tannins than red oak acorns.

Chickens experience tannin toxicity when they eat over 20% of their body weight in acorns in a single day. Consuming too many tannins can damage the kidneys, liver, and digestive system.

Signs of tannin poisoning in chickens include:

  • Lethargy and weakness
  • Decreased appetite
  • Weight loss
  • Diarrhea or bloody stool
  • Dehydration
A Fallen Acorn on The Ground (image by JamesDeMers, Pixabay)
A Fallen Acorn

In severe cases, tannin toxicity can lead to death. Keep a close eye on chickens with access to lots of acorns. Remove excess acorns if chickens seem sick. Make sure they have plenty of fresh water to stay hydrated.

What are the Benefits of Feeding Acorns to Chickens?

Acorns offer a variety of nutritional benefits when fed to chickens in moderation:

  • Protein – Acorns contain 2-8% protein, depending on the species. This protein helps chickens maintain muscle mass and egg production.
  • Healthy Fats – Almost half of an acorn’s calories come from fats. These fats provide chickens with energy and omega fatty acids for skin and feather health.
  • Fiber – Acorns contain insoluble fiber that promotes good digestion in chickens. Fiber helps move food through the gut.
  • Minerals – Acorns are rich sources of minerals like calcium, iron, magnesium, potassium, and zinc. These minerals are vital for bone strength, oxygen transport, and enzyme functions.
  • Antioxidants – Although high tannin levels can be toxic, tannins are also antioxidant compounds. In moderation, tannins may boost chickens’ immune systems.

The varied nutrition in acorns makes them a great supplemental feed. Just feed them alongside your chickens’ regular diet in limited quantities.

Are There Any Risks to Feeding Acorns to Chickens?

Acorns do pose some risks if chickens eat too many:

  • Tannin toxicity – As mentioned above, high tannin levels can damage chickens’ digestive systems and organs. Don’t let chickens gorge on acorns.
  • Choking hazard – Whole acorns are large, round nuts. Chickens can potentially choke on them if the acorns aren’t crushed.
  • Aflatoxins – Spoiled, moldy acorns may contain aflatoxins produced by Aspergillus fungi. Aflatoxins can cause liver damage and suppress chickens’ immune systems. Only feed fresh, uncracked acorns.
  • Unbalanced nutrition – If acorns make up too much of a chicken’s diet, they may miss out on key nutrients like enough protein for egg-laying. Supplement acorns with layer feed.


With proper precautions, the risks of acorns to chickens are low. Limit intake, crush acorns to prevent choking, and toss any moldy acorns.

Quercus Poisoning

Quercus poisoning is another term used to describe tannin toxicity in chickens and other animals after eating too many acorns. Quercus is the genus name for oak trees. The high tannin content of acorns can lead to Quercus poisoning if consumed to excess.

Remember that the total amount of acorns matters more than the tannin content. Chickens should not eat more than 20% of their body weight in acorns per day, regardless of tannin levels.

Signs of quercus poisoning include diarrhea, weakness, appetite loss, and potentially death. It develops within hours or days of a chicken eating a toxic amount of acorns.

To prevent Quercus poisoning, limit chickens’ acorn intake and provide plenty of fresh water. Crush acorns so chickens don’t gorge on whole nuts. Also, mix acorns into feed rather than offering them free choice.

Acorns on The Table (image by Couleur, Pixabay)
Acorns on The Table

Quercus poisoning can occur in other animals, too, like cattle, horses, goats, and sheep. Pigs can eat more acorns than chickens without ill effects due to their different digestive systems. Always keep an eye on any livestock with access to downed acorns.

What Type of Acorns Can Chickens Eat?

Chickens can eat all varieties of oak acorns, but some are safer than others:

  • White oak acorns – White oaks like swamp white oak and bur oak have lower tannins. Their acorns are a better choice for chickens.
  • Red oak acorns – Red oak acorns tend to have more tannins. Examples are northern red oak, black oak, and pin oak. Limit red oak acorns.
  • Fresh acorns – Old, decaying acorns may contain mold. Only feed fresh acorns right after they fall from trees.
  • Whole acorns – Shells help limit consumption. Avoid shelled “acorn nutmeat,” which lets chickens eat more.
  • Uncracked acorns – Don’t crack shells before feeding. It releases the oil and gives chickens full access to tannins.

Following these guidelines reduces the risks of tannin poisoning. But ultimately, any oak acorn variety should be fed in strict moderation.

Can Chickens Eat Acorns Seeds?

The seeds of oak trees are acorns themselves. So yes, chickens can safely eat acorn seeds in limited quantities. There is no difference nutritionally between acorn seeds vs. acorn nuts.

Whole acorns with the seed enclosed in the shell are preferable to bare acorn seeds. The shell controls intake and prevents overconsumption.

Offer chickens a handful of whole, uncracked acorns 2-3 times per week. Scatter them in the run so chickens can forage. This prevents fighting over a limited food source.

Never feed chickens an exclusive diet of bare acorn seeds. The high fat and tannin content require dietary balance with other feed. For the safest nutrition, feed acorn seeds mixed into a complete feed blend.

Can Chickens Eat Crushed Acorns?

It’s best not to crush acorns before feeding them to chickens. Crushing eliminates the shell, releasing more oil and tannins. Chickens may consume a toxic dose more easily.

Welsummer Chicken Rooster Sitting
Welsummer Chicken Rooster Sitting

That said, many chicken keepers do crush or chop acorns with no problems. Here are some tips:

  • Crush only a small batch at a time instead of your whole acorn supply.
  • Crush acorns just enough to break the shell without turning them into small pieces or powder.
  • Mix crushed acorns into feed. Don’t offer them free choice.
  • Start with very small amounts of crushed acorns to see if chickens tolerate them before increasing the ratio.
  • Closely monitor for signs of tannin toxicity, like diarrhea.

Crushing makes acorns more accessible to chickens. But it also allows them to eat faster and ingest more tannins. Weigh the risks and proceed with caution.

Can Chickens Eat Raw Acorns?

Yes, chickens can safely eat raw, uncooked acorns. In fact, raw acorns are healthier than cooked ones.

High temperatures can degrade the nutrients in acorns and alter the tannin content. Cooking makes acorns more palatable but less nutritious.

Chickens’ gizzards are specially adapted to grind and digest raw foods, even tough items like whole grains or nuts. Their strong digestive acids neutralize tannins effectively.

To feed raw acorns:

  • Select fresh, uncracked nuts right after they fall.
  • Rinse to remove dirt if needed.
  • Chop very lightly or crush just to break the shell.
  • Mix small amounts of chopped raw acorns into standard feed.


Raw acorns make the safest, most nutritious supplement for chickens. Never boil, bake, roast, or microwave acorns prior to feeding.

Can Chickens Eat Ground Acorns?

Grinding acorns into a fine powder or meal lets chickens consume them very quickly. The tannins become fully exposed. This increases the risk of tannin poisoning.

Acorns have a very oily, rich taste that chickens find appealing. Given free access, chickens may overeat powdered acorns in a short period.

If you wish to grind acorns:

  • Grind only very small batches at a time.
  • Immediately mix the powder into feed rather than feeding it alone.
  • Start with a ratio of 5% or less powdered acorns in feed to see if chickens tolerate it.
  • Closely monitor chickens for diarrhea and decreased appetite.
  • Adjust the ratio based on how chickens respond. More sensitive chickens may tolerate less.

While not ideal, grinding acorns can work if chickens’ intake is strictly limited. Feed no more than 20% ground acorns mixed into the overall diet.

How Much Acorns Can Chickens Eat?

Chickens should not consume more than 20% of their body weight in acorns within one day.

For example, a 5-pound chicken should eat no more than 1 pound of acorns per day.

Weigh your chickens to determine appropriate acorn amounts:

  • 4-pound chicken: 0.8-pound acorns daily max
  • 5-pound chicken: 1 pound acorns daily max
  • 6-pound chicken: 1.2 pounds acorns daily max
  • 7-pound chicken: 1.4 pounds acorns daily max
  • 8-pound chicken: 1.6 pounds acorns daily max

Split this into 2-3 smaller meals, rather than one large portion.

It is nearly impossible to limit acorns from free-ranging chickens…

Free-ranging chickens are nearly impossible to limit. Remove excess acorns from the area to discourage overeating if possible. Provide ample alternative forage and standard feed.

How to Feed Acorns to Chickens?

Here are some tips for safely feeding acorns to backyard chickens:

  • Select fresh, uncracked whole acorns soon after falling from trees. Discard any acorns with mold or holes.
  • Rinse off acorns outdoors to remove dirt and debris. Dry them fully before feeding them.
  • Lightly chop or crush shells to allow chickens access without fully exposing the nutmeat.
  • Mix crushed acorns into standard feed. Start with 5% or less and slowly increase the ratio.
  • Limit total intake to no more than 20% of each chicken’s body weight per day.
  • Split the allotted daily portion into multiple small feedings.
  • Provide plenty of fresh water at all times to help flush tannins.
  • Monitor chickens closely for signs of tannin toxicity, like diarrhea. Adjust or stop feeding acorns if issues arise.

With some care and planning, chickens can benefit from acorns as an autumn treat. Just stick to moderation and proper preparations.

How Often to Feed Acorns to Chickens?

Feed chickens acorns in limited amounts 2-3 times per week at most. Any more often increases their risk of tannin poisoning.

Acorns should never be a chickens’ main food source. They are a supplemental treat only. Stick to a ratio of no more than 20% acorns mixed into standard feed.

Chickens that free range under oak trees will eat more acorns…

Chickens that free range under oak trees eat acorns opportunistically. Try to rake up excess windfall to restrict uncontrolled consumption.

Monitor your flock closely for signs of tannin toxicity if they have access to lots of acorns. Diarrhea, lethargy, and poor appetite indicate they are eating too many.

Restrict acorn supplemental feeding to peak autumn months when nuts are freshly fallen. This seasonal treat adds diversity without endangering chickens’ health.

Can Baby Chickens Eat Acorns?

Baby chicks under 4 months old should not eat whole acorns. Their digestive systems are too immature to safely process tannins.

Once chicks reach 4-6 months old, they can start sampling very small pieces of crushed acorn. Limit treats to just a bite or two initially. Gradually work up to 1-2 whole acorns every few days.

Wait until 6 months old to mix small amounts of chopped acorns into feed. Always supervise chicks when offering new foods.

chicks in a small coop
Young Chicks in Coop

Free-ranging mothers may eat acorns that alter the taste of their eggs. Chicks hatching in autumn ​may start pecking ripe acorns naturally. But supplemental feeding of acorns should still be minimal for young birds.

With judicious monitoring and feeding regimens, chickens of all ages can enjoy acorns as a seasonal dietary addition. Avoid overindulging, and your flock will benefit from these nutritious nuts.

Frequently Asked Questions

Can Chickens Eat Acorns Safely?

Yes, chickens can safely eat acorns in moderation. However, it’s crucial to ensure they are properly prepared and not exclusively fed acorns, as they should be just a part of a balanced diet. Acorns are a good source of nutrients but can be high in tannins, so limiting the quantity and processing them can help prevent digestive issues.

Are There Toxic Acorns to Chickens?

Yes, some acorns have higher toxic tannin levels for chickens. Acorns from the red oak group contain higher levels of tannins and can be harmful. It’s advisable to feed chickens only acorns from the white oak group, as they are lower in tannins and safer for consumption. If chickens are fed small amounts of acorns from the red oak group and infrequently, that should not be a probem. Additionally, always remove the caps from acorns, as they may pose a choking hazard.

Are Certain Breeds of Chickens Prone to Digestive Issues with Acorns?

While there isn’t strong evidence suggesting specific chicken breeds are more prone to digestive issues with acorns, individual chickens may react differently. It’s essential to introduce acorns gradually into their diet and monitor for any signs of digestive discomfort. If a particular breed shows sensitivity, adjustments to the quantity of acorns or alternative treats may be necessary.