Yes, chickens can eat corn. Honestly, if your hens eat layer feed, they’re already eating it every day, because corn is the top ingredient in most bags.
So the real question isn’t whether corn is safe. It’s how much extra corn your hens should get on top of a feed that was built around it. Turns out it’s a lot less than this page used to say.
I rewrote this page from 15 sources, and they’re all listed at the bottom. Most of the feeding rules come from state extension services. The health parts come from the Merck Veterinary Manual, and the food numbers come from USDA’s FoodData Central. Where something is my own math or my own call, I’ll say so.
The short version.
- Corn is safe for chickens, and it’s already the main grain in most layer feeds.
- It has about half the protein of layer feed and almost none of the calcium.
- A hen’s whole treat share is about 1 to 1.5 tablespoons of dried corn a day. A quarter cup per hen is three to four times that.
- Scratch and cracked corn go out in the afternoon, after the feed. They don’t get mixed into the feeder.
- Sweet corn on the cob and plain air-popped popcorn are fine treats. Salted popcorn isn’t.
- Moldy corn and treated seed corn never go to the flock.
Yes, and It’s Already in the Feed Bag
Corn isn’t some rare treat your chickens never see. Dr. Jacquie Jacob wrote the Poultry Extension’s page on corn. It says “Corn, also known as maize, is typically the cereal grain of choice for poultry feeds in the United States”. The University of Kentucky’s poultry nutrition page says it in fewer words: “In the United States corn is the main grain used in poultry feeds”.
Alabama Extension’s guide to feeding laying hens goes a step further. “Most commercially available poultry feeds have corn as their number one ingredient,” it says. “Corn is an excellent source of carbohydrates in the form of starch”.
Jacob adds that “Corn is the easiest grain for chickens to digest”. Yellow dent corn is the kind usually used in feed, she says. None of the sources I read calls corn bad for chickens. It’s pretty much the base of what they eat. And that’s exactly why the extra corn matters. Your layer feed is a balanced ration with the corn already counted in. Whatever you add on top changes that balance. Extra corn pulls it toward more starch and less protein.
What’s in a Kernel, and What Isn’t
Here’s what USDA measured in 100 grams of dried yellow corn grain (FoodData Central, FDC ID 170288):
- Water: 10.4 grams.
- Protein: 9.42 grams.
- Fat: 4.74 grams.
- Calcium: 7 milligrams.
- Phosphorus: 210 milligrams.
Jacob’s page lists corn at 7.5 percent crude protein and 0.01 percent calcium, from a 2016 feed ingredient table. The two sources don’t match to the decimal. They tell the same story, though.
Now put that next to what your hens need. Alabama’s layer diet calls for “Protein 16% or more” and “Calcium 3% to 4%”. So 100 grams of layer feed carries at least 16 grams of protein and 3,000 to 4,000 milligrams of calcium.
Corn has roughly half that protein. It has about one five-hundredth of the calcium.
That’s my math from those sources, and the calcium is the part that hits your eggs. Alabama’s guide says “The eggshell is composed of around 96 percent calcium carbonate”.
The protein corn does have comes with a catch, too. Jacob writes that “Corn protein is low in methionine, so in the United States, corn is typically combined with soybean meal”. She also notes that “Much of the phosphorus in corn grain is bound to phytate and is not readily available to birds”.
Yellow corn and yolk color
Here’s the one thing yellow corn does that white corn doesn’t. Feedipedia’s maize page says white maize and yellow maize are equal in energy and protein for poultry. Then it adds: “Yellow maize contains more carotene and cryptoxanthin which are beneficial to yolk pigmentation”.
Jacob says something similar about corn gluten meal, which she calls “a high-protein by-product of the corn milling process”. It “has the pigment xanthophyll, which enhances the yellow color of egg yolks”.
USDA’s numbers show the difference in a small way. Its white corn grain entry lists zero vitamin A, while yellow lists 11 micrograms per 100 grams. Otherwise the two entries match on protein and calcium (FDC IDs 168920 and 170288).
I couldn’t find a study on whether a backyard handful of yellow corn changes yolk color. So I won’t promise you darker yolks from treats. By Feedipedia’s numbers, white corn feeds a hen just as well. The yellow is about the yolk’s color.
How Much Corn Is a Treat
Two numbers do most of the work here. Alabama says “A laying hen will consume between 100 and 150 grams of feed per day”. Colorado State says “Treats should make up no more than 10% of their daily diet”. By my math, that’s 10 to 15 grams of treats per hen per day.
USDA weighs a cup of dried corn grain at 166 grams. A tablespoon is a sixteenth of a cup, so that’s about 10 grams. Your hen’s whole treat share works out to about 1 to 1.5 tablespoons of dried corn a day.
Got four hens? That’s roughly a quarter to a third of a cup for the whole flock. And that’s only if corn is the one treat they get that day.
The old version of this page said to start with a quarter cup of cracked corn per hen, mixed into the feed. That’s about 41 grams, or 28 to 42 percent of what a hen eats in a day. It’s three to four times the treat share.
Here’s what that swap does on paper. Take 41.5 grams of layer feed out and put 41.5 grams of corn in its place. The protein in that portion drops from about 6.6 grams to 3.9. The calcium goes from 1.2 to 1.7 grams down to about 3 milligrams. My math again, from the USDA and Alabama numbers above.
Scratch goes in after the feed, not in it
Scratch grain leans hard on corn. Colorado State’s own scratch recipe is “35% cracked corn,” with barley and oats making up most of the rest. The same page says “Scratch feed is not as nutritious as mash, so it must be limited in use”.
Jacob has the best line on it, honestly: “Scratch grains are like french fries—chickens that eat too many scratch grains have less of an appetite for more nutritious feed”.
Her advice is to “feed them to chickens in the afternoon after birds have eaten complete feed”. Then you give “only as much scratch grains as chickens can finish in 15 to 20 minutes”. Mixing it into the feeder is the other mistake. Alabama calls scratch and treats “ice cream”. It warns that with too much of it, “their egg production is likely to suffer”. It goes on: “avoid mixing scratch grains with your complete feed”. That “only dilutes the nutrients your birds need,” it says.
Jacob lists “Supplementing complete feeds with cracked corn” as a common mistake. The Merck Veterinary Manual names “dilution of balanced and nutritionally complete rations with scratch or supplemental feed” as a common problem in backyard flocks.
Too much energy is the real risk
With plain corn, the risk to watch is weight. That’s not a small thing.
Merck’s page on fatty liver hemorrhagic syndrome calls it “a metabolic disorder of chickens typically causing sudden death of birds fed high-energy diets with limited exercise”. It also calls it “a leading noninfectious cause of death in backyard chickens”.
Corn isn’t singled out. Merck says the syndrome is “associated with a surfeit of energy intake, regardless of the source, in birds whose exercise is limited”. But corn is mostly starch. A daily scoop of it is an easy way for a penned flock to take in more energy than it needs.
That part’s my read.
And it’s not just about sudden death. Merck adds that “In addition to sudden death, FLHS is associated with decreased egg production”.
Grit goes out with whole grain
Grit looks like a fight between sources, but it isn’t once you read the conditions. Alabama says birds on ground feed don’t need it: “Birds that generally consume whole grains and seeds (songbirds, pet birds) need a source of grit in their diet. Backyard chicken flocks do not”. UC Davis agrees for a pellet-only diet.
Corn changes that.
Jacob says “When feeding scratch grains to chickens, it is also important to provide grit to help the chickens grind and digest the grains properly”. Colorado State says birds in a small run need grit from you.
So if you toss whole or cracked corn, my call is that grit goes out too. Just don’t count oyster shell. Jacob warns that “Oyster shell should not be used as grit since it is too soft and does not aid in grinding”.
Chicks and cold nights
Chicks are a hard no.
UF/IFAS’s guide to baby chicks says “Do not feed three-grain scratch or ground corn”. Chicks need more protein and nutrients than those feeds give them, it says. Our post on what baby chicks can eat covers the rest.
Then there’s winter. You may have heard that corn at bedtime keeps hens warm. I couldn’t find a source that says so. What Jacob does say is “Feed intake increases during cold weather as chickens consume more to supply the extra energy needed”. Their feed already has the corn in it. So when it’s cold, my call is to keep the feeder full rather than add a corn bedtime snack.
Corn on the Cob Is Mostly Water
Sweet corn is a different food from the dried corn in the feed bag. USDA measured 76 grams of water in 100 grams of raw yellow sweet corn. It also found 3.27 grams of protein and 2 milligrams of calcium (FDC ID 169998).
USDA weighs the kernels on one ear, too. A medium ear, 6¾ to 7½ inches long, yields 102 grams. A large one, 7¾ to 9 inches, yields 143.
Set that against the 10 to 15 gram treat share. One medium ear covers the treats for about 7 to 10 hens for a day. A large ear covers about 10 to 14. That’s my math. It means a whole ear tossed to two or three hens is a lot more than a treat.
Whatever the ear, plain is the rule. Colorado State says to make sure scraps “are not salty or have citrus or are moldy”. So a cob from your dinner table only goes out if nobody salted it.
Colorado State also says “Do not feed more than can be consumed in 5 – 10 minutes to not attract nuisance animals”. I couldn’t find a source on hens eating the bare cob. So my call is to pick the cobs up once the kernels are gone.
Popcorn: Plain Is Fine, Salted Isn’t
Popcorn is corn too. Feedipedia lists popcorn next to sweet corn as maize types “more intended for food uses”.
Plain air-popped popcorn is about as light as food gets. USDA puts a cup at 8 grams, with 8 milligrams of sodium per 100 grams (FDC ID 167959). A hen’s 10 to 15 gram treat share comes to about 1¼ to 2 cups of it, by my math. That’s kinda a lot of popcorn for one bird.
Salted popcorn is where it goes wrong. USDA’s oil-popped popcorn with salt has 884 milligrams of sodium per 100 grams, at 11 grams a cup (FDC ID 170247). Microwave popcorn has 909 milligrams of sodium and 43.6 grams of fat per 100 grams (FDC ID 167549).
Now compare that with the feed. UMaine Extension says sodium is added to chicken feeds “at the rate of about 0.15% sodium in the feed mix”. At 100 to 150 grams of feed a day, that’s 150 to 225 milligrams of sodium. One cup of salted popcorn adds about 97 milligrams, which is 43 to 65 percent on top. That’s my math, and it’s why our can chickens eat it checker says to skip salted popcorn. The same salt math is behind our hummus post.
The unpopped kernels at the bottom of the bowl are just dried corn. If they’re plain, they count toward the same tablespoon.
Moldy Corn and Treated Seed Corn Stay Out
Moldy corn is the dangerous kind, and you can’t fix it by picking the mold off. Kentucky’s poultry nutrition page says “Even if the mold is removed, the mycotoxins they produce will remain and can be very toxic to poultry”.
The trouble can start before the corn ever reaches you. Merck says “Mycotoxins can affect cereal grains and other agricultural commodities before harvest or after harvest during transport or storage”. Feedipedia says the fungus behind aflatoxin “invades maize when drought or earworm stresses occur”. And once mycotoxins form, Merck says “they are chemically stable and persist”.
The signs can be quiet. Merck says “Initially, refusal of new feed may be the only clinical sign”. Its aflatoxin page says the toxin hurts “egg production and eggshell quality”. Merck also says chickens are “relatively resistant” while ducklings and turkeys are susceptible. That’s worth knowing if your flock is mixed.
Storage matters too. Merck lists “prolonged feed storage, leading to degradation of vitamins and minerals” among common backyard problems. It also warns that “feed and grain rapidly deteriorate in airtight containers, and plastic bags can entrap moisture content”. My call is to buy scratch in amounts you’ll use up and keep it somewhere dry. If a bag smells off or the corn has clumped or changed color, it goes in the trash, not the run.
Seed corn from the planting bag
Leftover seed corn looks like a free snack, and it may not be. Under the federal seed rules (7 CFR 201.31a), treated seed has to be labeled as treated.
When what’s on it is harmful to “humans or other vertebrate animals,” the label carries a warning such as “Do not use for food,” or “Do not use for feed”. The worst treatments get a skull and crossbones and a red warning like “Treated with Poison”. So read the seed tag. If it says treated, your hens don’t get it.
How I’d hand out corn.
- Feed first. Corn goes out in the afternoon, after your hens have eaten their layer feed.
- Measure it. About a tablespoon of dried corn per hen, less if they’re getting other treats that day.
- Scatter it, don’t mix it in. Give what they’ll clean up in 15 to 20 minutes.
- Put grit out if you feed whole or cracked corn. Keep the oyster shell out too, but not as grit.
- Sweet corn and popcorn go out plain, with no salt.
- Moldy corn and treated seed stay out of the run.
UC Davis’s feeding guide says it about as well as anyone: “treat the scraps like a treat not like the main course”. Corn’s a good treat. It just isn’t extra feed, because it’s already in the feed.
Want to know how much feed your flock goes through? Our chicken feed calculator works out pounds a week and how long a 50 pound bag lasts. We’ve also written up horse oats and dried peas and lentils. And there’s a longer list of what not to feed chickens.
Sources
- Jacquie Jacob, University of Kentucky, Poultry Extension: Corn in Poultry Diets.
- Jacquie Jacob, Poultry Extension: Feeding Chickens for Egg Production in Small and Backyard Flocks.
- Wilmer Pacheco, Joseph Gulizia and Kevin Downs, Alabama Cooperative Extension: Feeding the Laying Hen (ANR-2913).
- Colorado State University Extension: Raising Poultry the Organic Way: Disease Control and Feeding.
- University of Kentucky Animal and Food Sciences: Poultry Nutrition.
- Anne Lichtenwalner and H. Michael Opitz, University of Maine Cooperative Extension: Salt is an Important Nutrient for Poultry.
- Maurice Pitesky and Nancy Reimers, UC Davis / UC Agriculture and Natural Resources: Feeding your Flock.
- Christopher DeCubellis, UF/IFAS Extension: Care of Baby Chicks (AN182).
- Yuko Sato, Merck Veterinary Manual: Management of Backyard Poultry (reviewed November 2024).
- Rocio Crespo, Merck Veterinary Manual: Fatty Liver Hemorrhagic Syndrome in Poultry (updated September 2024).
- Dulmelis Sandu, Merck Veterinary Manual: Mycotoxicoses in Poultry (updated September 2024).
- Dulmelis Sandu, Merck Veterinary Manual: Aflatoxicosis in Poultry.
- V. Heuzé, G. Tran and F. Lebas, Feedipedia: Maize grain.
- USDA FoodData Central: dried corn grain, raw sweet corn and popcorn (SR Legacy FDC IDs 170288, 168920, 169998, 167959, 170247, 167549).
- eCFR: 7 CFR 201.31a, Labeling treated seed.
Sources checked October 27, 2026. The protein and calcium comparisons, the tablespoon and ear counts, and the sodium math are my math from these sources. The amounts per hen, the grit and storage advice and the steps are my own calls. We aren’t vets. If a hen eats moldy feed or seems sick, call a vet who sees poultry.
Related read: How to Raise Chickens for Eggs — Instant PDF download. Secure checkout by Stripe