How Much Hay Does a Horse Eat a Day? Flakes, Free Choice and Alfalfa

How much hay does a horse eat a day?

The rule of thumb for how much hay a horse eats a day is 1.5% to 2.5% of its body weight: about 15 to 25 pounds for a 1,000-pound horse, with 2% (20 pounds) as the usual target. Whatever the diet, total forage should never drop below 1% of body weight, or 10 pounds for that same horse.

That old rule is getting a fresh look this fall. At BEVA Congress, the British Equine Veterinary Association's annual meeting (September 10–12), the final day included a nutrition session on basic feeding, ulcer-prone horses, protein for laminitics and refeeding thin horses. On X, one account summed up the mood as vets calling for free-choice hay to become standard for stabled horses.

We couldn't confirm that exact wording, because the lectures are only open to delegates and paying viewers. But it matches what extension specialists have said for years: a forage-first horse diet, with grain added only if the horse needs it. Add pricey drought-year hay, the first cold nights and the long-running debate on Spanish-language horse forums over whether alfalfa causes colic, and "how many flakes?" is the question in every barn aisle.

The percent-of-body-weight rule

Horses are built to eat small amounts almost all day. Their stomachs make acid around the clock, and most of the gut is a fermentation vat for fiber. That is why forage, not grain, is the foundation of every sound horse diet.

A few things change where your horse lands on that chart:

• Dry matter vs. as-fed. The percentages are for dry matter. Hay is only about 10% water, so add a little on the scale: 20 pounds of dry matter is roughly 22 pounds of hay.
• Pasture counts. Fresh grass is mostly water, but a horse grazing good pasture needs less hay. A horse in a stall or dry lot gets every bite of forage from you.
• Workload and body type. Hard keepers, nursing mares and horses in real work sit near the top. Easy keepers usually need the lower end, ideally eaten slowly.

How much hay for the whole winter?

Penn State Extension ran the numbers for a 1,100-pound horse eating 22 pounds a day through a 150-day, November-to-March winter. With normal storage and feeding waste, that horse needs about 2 tons, or roughly 98 small bales of 40 pounds. Multiply by your herd and add a cushion if your hay sits outside.

From flakes to pounds: stop counting, start weighing

A flake is the natural slice that separates from a small square bale, and it is a poor unit of measure. Penn State Extension weighed flakes from one bale and found them ranging from 3.2 to 4.6 pounds. In another comparison, one cutting's flakes ran about 5 pounds and another's about 7, a 10-pound swing if you feed five flakes a day.

Here is how to switch your feed chart from flakes to pounds:

1. Grab a scale. A luggage scale works for a full hay net; a bathroom scale works with a trash can (subtract the can).
2. Weigh three to five flakes from the current load and average them.
3. Divide. Daily target ÷ average flake weight = flakes per day. A 1,000-pound horse at 20 pounds eats four 5-pound flakes or six 3.5-pound flakes.
4. Write pounds, not flakes, on the stall card so every barn helper feeds the same amount.
5. Re-weigh every new load or cutting. Flake size and density change from one supplier or cutting to the next.

Where the hay really goes

Waste eats your budget. Penn State estimates hay fed on the ground loses about 13% to trampling and soiling, compared with about 5% in a rack, 3% in a basket feeder and 1% in a slat feeder. A round bale with no feeder can waste more than half.

Free-choice hay for stabled horses: does it work?

Free choice means hay is in front of the horse at all times, usually in a slow feeder or small-hole net. The argument is simple: a stalled horse fed twice a day can stand for hours with an empty stomach still making acid, and with nothing to do.

Most horses handle the switch well once they settle. Equine nutritionist Clair Thunes, writing for TheHorse in July, notes that the majority of horses self-regulate after several weeks, though some take longer. In her clients' barns, the horses settled at about 2% of body weight a day.

Who should NOT get unlimited hay

• Easy keepers that gain weight on air.
• Horses with metabolic problems (equine metabolic syndrome, insulin dysregulation or a laminitis history), which may never self-regulate.
• Horses that are already overweight. For them, weigh the daily ration and spread it through the day in a small-hole net so it lasts longer.

How to make the switch

• Start with grass hay, not alfalfa.
• Use a slow feeder or small-hole net; slow feeders make the same hay last longer.
• Body-condition score every two weeks and watch the crest of the neck for fat.
• If weight keeps creeping up, free choice may not suit that horse; go back to weighed hay spread through the day in a small-hole net.

Grass hay vs. alfalfa: myths and facts

In the alfalfa vs. grass hay debate, both sides are good horse hay. They just do different jobs.

Four alfalfa myths

• "Alfalfa makes horses hot." There is no scientific evidence for that. Extra calories mostly show up as extra weight.
• "Alfalfa damages kidneys." Healthy horses handle the extra protein if they have plenty of water; they just urinate more. Only horses with existing kidney disease need to limit it.
• "Alfalfa is full of sugar." Cool-season grasses like timothy, brome and orchard grass often carry more sugar and starch than alfalfa.
• "Alfalfa makes horses cough." Dust and mold do. Alfalfa takes longer to dry in the field, so a poorly cured bale can be dusty.

So does alfalfa cause colic?

Good, dry alfalfa hay fed consistently is not a colic trigger for most horses. Alfalfa can even help ulcer-prone horses, because its calcium and protein help buffer stomach acid. The real risks come from how it is fed:

• Sudden changes. Switching any hay abruptly can upset gut microbes. Penn State advises making feed transitions over 10 to 14 days, mixing old and new and shifting a little more each day.
• Wet, heating or moldy alfalfa. Freshly cut green alfalfa piled up to ferment, or bales that feel warm or smell musty, are the stuff of those forum horror stories.
• Blister beetles. They swarm in flowering alfalfa and can be crushed into bales, and their toxin stays dangerous even after the hay dries and is stored. Buy from growers who manage for them.
• Enteroliths. These stone-like mineral masses in the colon are linked with alfalfa-heavy diets, especially in California and the West, plus stall confinement. Horses that have had one should avoid alfalfa.

A practical middle ground for many horses is a grass hay base with a smaller share of alfalfa; ask your vet what mix fits yours. If your horse paws, rolls or goes off its feed, call your vet first; our health basics page covers other warning signs.

Fall feeding for senior horses with poor teeth

Many older horses struggle to hold weight going into winter, and worn or missing teeth are a big reason. One study found dental abnormalities in every horse over 30 it examined. (In the Southern Hemisphere, save this section for March.)

Signs your senior can't handle long-stem hay

• Quidding: dropping wads of half-chewed hay.
• Long pieces of fiber in the manure.
• Hay left over that used to be cleaned up, or very slow eating.
• Weight loss even though you are feeding the same amount.

What to feed instead

• Soaked hay cubes or pellets, chopped hay or soaked beet pulp can replace some or all of the long hay. Soak until mushy; dry cubes can cause choke in a horse that can't chew.
• A complete senior horse feed is built to be the whole diet, with more fiber than regular grain. Fed as the only forage, these feeds generally need around 1.5% of body weight a day, about 15 pounds for a 1,000-pound horse; follow the bag's directions.
• Split it up. For horses with few teeth, nutritionists suggest four to six wet meals a day instead of two big ones.
• Book a dental exam before winter. Vets generally recommend dental exams twice a year for older horses. Ask your vet to look for other causes too, because weight loss can also come from metabolic or hormonal problems.

When temperatures drop below about 18°F, Penn State suggests an extra flake per horse. Fermenting fiber produces heat, and grass hay eaten slowly overnight is a steady furnace. See our care guide for more winter basics.

What to do this week, and what to watch next

• Weigh three flakes from your current load and rewrite your feed chart in pounds.
• Multiply body weight × 2% for a daily target, then × days until spring grass for your winter hay order, plus a waste cushion.
• Look for long overnight gaps in your stall schedule and add a slow-feeder net.
• Plan any hay switch over 10 to 14 days.
• Inspect alfalfa flakes for beetles and every bale for heat, dust or mold.
• Book a fall dental exam for seniors and body-condition score everyone now.

Watch next: the first hard cold snap, when hay needs rise; hay prices in drought regions heading into winter; and frosty fall pasture if your horse is laminitis-prone. BEVA's 2026 lectures are available on demand, and we will update this guide if published guidance on free-choice hay comes out of them.