Horses evolved as continuous grazers, spending 16–18 hours a day consuming small amounts of fibrous plant material. When we replace pasture with hay, we're asking their digestive system to work differently than it's designed to — and the decisions we make about how much hay, what type, and how it's fed have a direct impact on digestive health, behavior, and long-term soundness.

How Much Hay Does a Horse Need Per Day?

The standard recommendation is 1.5–2% of body weight in forage daily. For a 1,100-lb horse, that's 16.5–22 lbs of hay per day. For a 1,400-lb draft cross, that's 21–28 lbs.

Horse WeightMaintenance (lbs/day)Light Work (lbs/day)Heavy Work / Late Gestation (lbs/day)
800 lbs (small horse, pony)12–1614–1816–20
1,000 lbs15–2018–2220–25
1,100 lbs (avg quarter horse)17–2220–2522–28
1,200 lbs18–2422–2724–30
1,400 lbs (draft cross)21–2825–3228–35
Body condition is your best feedback. Use the Henneke Body Condition Score (1–9 scale) to monitor monthly. A score of 4–6 is ideal for most horses; below 4 means you need to increase feed; above 7 means you need to reduce or switch to lower-calorie hay.

Best Hay Types for Horses

Horses thrive on grass hay for most of their lives. The specific type matters less than the quality — a good orchard grass hay beats a poor timothy hay every time.

Timothy

The traditional horse hay. Fine-stemmed, palatable, appropriate for horses at maintenance and in light work. First-cut timothy has high fiber and moderate protein — ideal for easy keepers. Second-cut timothy is leafier with more protein, appropriate for horses in active work or young growing horses.

Orchard Grass

Increasingly popular and often preferred by horses over timothy for palatability. Softer texture, good protein content, and widely available in the eastern US. An excellent all-around choice for most horses.

Alfalfa (Use Carefully)

Alfalfa is appropriate for horses with high energy demands — mares in late pregnancy or lactation, horses in heavy athletic work, underweight horses being rebuilt. It's generally inappropriate as a primary hay for mature horses at maintenance because of the caloric density and high protein content. However, small amounts of alfalfa mixed with grass hay (10–30% of the ration) is a common and reasonable approach for adding palatability and nutrition without the risks of all-alfalfa feeding.

Bermudagrass

The dominant hay in the South. Well-managed coastal bermuda or Tifton 85 is excellent horse hay. The key variable is cutting maturity — bermuda cut at 4–5 weeks regrowth is nutritious; cut at 8+ weeks is stemmy and poorly digestible.

Fescue (With Caution)

Avoid feeding fescue hay of unknown endophyte status to pregnant mares. Endophyte-infected fescue causes serious reproductive complications including agalactia (failure to produce milk after foaling), thickened placentas, and prolonged gestation. If your hay includes fescue and you have pregnant mares, have the hay tested or switch to certified endophyte-free material in the last 90 days of gestation.

Feeding Practices That Affect Health

Feed Frequency

Horses produce stomach acid continuously — unlike humans, acid secretion doesn't stop when the stomach is empty. A horse that goes more than 4–6 hours without forage is at elevated risk for gastric ulcers. The practical implication: twice-daily hay feeding is a minimum, and free-choice hay (available at all times) is better for digestive health than timed feedings, particularly for horses prone to ulcers or stall-kept horses with limited turnout.

Round Bale Feeding

Free-choice round bale access in a pasture or dry lot is natural for horses in terms of feeding behavior and digestive health. The challenge is caloric control — horses with 24/7 round bale access will often overconsume, particularly with high-quality hay. Slow-feed hay nets stretched over the round bale are the most practical solution: they extend feeding time, reduce waste, and slow consumption without completely restricting access.

Feeding on the Ground vs Elevated

Feeding hay on the ground more closely mimics natural grazing posture (head down, spine aligned) and allows the horse's neck and back muscles to stretch naturally. It does increase waste and contamination risk from manure. Elevated feeders reduce waste but keep the horse's head up, which isn't the natural eating position. For horses without respiratory problems, a compromise — a hay rack or manger at roughly chest height — balances posture and waste control adequately.

Horses With Special Hay Needs

Horses With Equine Metabolic Syndrome (EMS) or Laminitis History

Non-structural carbohydrates (NSC) — sugars and starches in hay — are the primary dietary concern for metabolic horses. Low-NSC hay (under 10% NSC on a dry matter basis) is the target. This requires a hay analysis — you can't determine sugar content by looking at or smelling hay. Soaking hay for 30–60 minutes in cold water leaches water-soluble sugars and can reduce NSC by 30–40%, though the effectiveness varies by hay type and temperature.

Horses With Heaves (Recurrent Airway Obstruction)

Heaves is triggered by mold spores, dust, and organic particles in hay. Management options include: (1) complete switch to soaked or steamed hay, which dramatically reduces airborne particles; (2) feeding hay on the ground rather than in a net or rack above head height (mold spores fall down, not up); (3) switching to haylage or hay cubes, which have lower dust than dry hay.

Senior Horses With Dental Issues

Horses with worn, missing, or broken teeth may not be able to chew long-stem hay adequately. Hay cubes soaked to a mash, complete senior feeds, or hay pellets can substitute for or supplement hay in these horses. Have your equine dentist assess chewing ability annually for horses over 20.

Related Guides

Frequently Asked Questions

How many flakes of hay should I feed my horse per day?
Flake weight varies enormously — a flake from a compressed square bale can weigh 3 lbs; a flake from a large, loosely packed bale can weigh 8 lbs. Counting flakes is unreliable. Weigh your hay — a simple hanging scale (the kind used for luggage or fishing) works fine. Aim for 1.5–2% of your horse's body weight per day, split into at least two feedings.
Should I feed grain in addition to hay?
For most horses at maintenance on good-quality hay, grain is not necessary and can cause weight and metabolic problems. Horses that need grain are those in hard athletic work that can't maintain weight on hay alone, broodmares in late pregnancy or lactation where hay protein isn't sufficient, and young growing horses. Always add grain gradually and balance with adequate hay — grain without adequate forage dramatically increases ulcer and colic risk.
What happens if I feed a horse bad hay?
Moldy hay can cause colic, respiratory disease (heaves), and in severe cases, mycotoxin poisoning. Dusty hay can cause heaves even without visible mold. Hay baled at high moisture that heated internally has reduced protein (Maillard reaction destroys lysine) and reduced digestibility. The effects range from mild (loose manure, minor coughing) to serious (colic requiring veterinary treatment). Never feed hay that smells moldy or musty to horses.
How long can hay sit in a round bale net before it goes bad?
In dry conditions, hay in a slow-feed net can last 2–3 weeks without quality loss. In wet weather, hay exposed to rain and humidity can develop surface mold within 3–5 days. In a covered shelter with good airflow, hay can stay in a net for several weeks. Remove and check any hay that has been wet — smell it before offering it back to horses.
Disclaimer: This guide provides general educational information. Hay requirements for individual horses vary based on health status, work level, and metabolic history. Consult your veterinarian or equine nutritionist for guidance on horses with metabolic conditions, dental issues, or other health concerns.