Spring Pasture Laminitis Prevention: Horse Owner Guide

How do I prevent spring pasture laminitis in my horse?

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Spring pasture laminitis is preventable with a practical, daily management routine rather than luck. The risk window opens the moment lush grass starts growing in 2026, and the stakes are serious. Laminitis is the second biggest killer of horses after colic, according to Virbac Australia. A checklist approach, applied consistently through spring and autumn, gives horse owners a clear path to reducing that risk.

Why is spring grass so dangerous for horses at risk of laminitis?
Which horses are most at risk of pasture-associated laminitis?
What does the early warning checklist look like day to day?
When is the safest time of day to turn a laminitis-prone horse out?
How should I manage pasture and feeding to lower the risk?
Do grazing muzzles and drylot turnout actually work for prevention?
How can Equine Salt Therapy fit into a laminitis-aware management plan?
Key Takeaways
References

Why is spring grass so dangerous for horses at risk of laminitis?

Spring grass is dangerous because it holds higher nonstructural carbohydrates, meaning sugars and starches, and less fibre than grass later in the season. According to the University of Illinois College of Veterinary Medicine, those extra sugars and starches ferment in the horse’s gastrointestinal tract, disturbing the bacterial balance and potentially triggering laminitis.

As grass matures, it shifts to structural carbohydrates and becomes more fibrous. Seed development signals that transformation, which is why early spring growth presents the greatest nutritional risk. A large intake of rapidly fermentable carbohydrates can drop hindgut pH, causing hindgut dysbiosis and endotoxemia, according to the University of Georgia Extension.

Laminitis is usually caused by overeating feeds rich in soluble carbohydrates, mainly cereal grains and lush spring or autumn pasture. Virbac Australia notes that excess starches and sugars spill into the large bowel where bacteria ferment them, producing lactic acid and releasing endotoxins thought to damage the laminae. The laminae are the tissue attaching the coffin bone to the inside of the hoof wall, and inflammation there is the core problem.

Which horses are most at risk of pasture-associated laminitis?

The uncomfortable answer is that pasture turnout can trigger laminitis even in lean, nonobese horses with no history of the condition. Kentucky Equine Research warns that no horse is automatically safe simply because it looks fit. Kentucky Equine Research advises that all dietary changes should be made slowly rather than suddenly turning a horse out on pasture for the bulk of every day.

Endocrinopathic laminitis may account for as many as 90 percent of laminitis cases in horses, according to the University of Georgia Extension. The two conditions most associated with insulin dysregulation are equine metabolic syndrome, or EMS, and pars pituitary intermedia dysfunction, or PPID. PPID is typically found in horses over 20 years of age.

Exposure of an insulin-resistant horse to a high-carbohydrate diet sharply raises insulin levels, which can affect blood flow to the laminae and cause laminitis. The University of Illinois College of Veterinary Medicine recommends that obese horses be tested for insulin resistance, and that insulin-resistant horses not be allowed to graze lush pastures. A dry lot with hay is the safer option until pastures mature.

What does the early warning checklist look like day to day?

The early warning checklist starts with hands on the hooves. Early indications of laminitis include hooves that are warm to the touch and horses that appear sore or unwilling to move, according to Kentucky Equine Research. At-risk horses need to be monitored daily for these signs during the spring risk window.

Acute laminitis signs begin within hours or days and include an increased digital pulse and potential heat in the hooves. The University of Georgia Extension explains that laminitis more commonly affects the front hooves, causing a laminitic stance where the horse shifts weight off the front feet. A horse standing rocked back onto its hindquarters is showing a classic pain response.

Owners should immediately remove a horse from pasture and have it evaluated by a veterinarian if the horse shows tenderness when walking or turning. The University of Illinois College of Veterinary Medicine stresses that early intervention matters because severe laminae damage can cause the coffin bone to sink or rotate within the hoof capsule, a condition called founder. Once rotation occurs, the attachment is permanently disrupted.

When is the safest time of day to turn a laminitis-prone horse out?

The safest time of day to turn a laminitis-prone horse out is early morning or evening. Water-soluble carbohydrate levels in pasture are lowest during these windows, making them the strategic turnout times, according to Kentucky Equine Research. Pasture sugar levels are lowest in the morning, so grazing should be avoided after about 11am.

During spring and autumn, access to pasture should be limited to only 90 minutes, according to Virbac Australia. Laminitic horses should not graze stressed short grass, frosted pastures, or drought-recovering pastures, as these may contain high sugar levels. A short green shoot is not a safe snack.

Lack of grazing is not the same as lack of turnout. Horses benefit from turnout and regular exercise to increase circulation to the feet and maintain appropriate body weight. Kentucky Equine Research notes that a dry lot or arena turnout can deliver those benefits without the sugar load, which is the point of the entire exercise.

How should I manage pasture and feeding to lower the risk?

Pasture and feeding management starts with keeping at-risk horses in a dry lot and feeding hay until pastures are more mature. The University of Illinois College of Veterinary Medicine recommends this approach for obese horses, insulin-resistant horses, and horses with a previous laminitis episode. Maturity changes the carbohydrate profile of grass, making it safer.

All dietary changes should be made slowly rather than suddenly turning a horse out on pasture for the bulk of every day. Kentucky Equine Research advises that a gradual transition gives the hindgut microbiome time to adapt. Pastures should also be mowed to keep grass short, which reduces the accumulation of sugars in the plant.

Feed a balanced diet high in fat and fibre while avoiding sugars such as grains and carbohydrate-rich pastures. Virbac Australia notes that mature lucerne hay is typically lower in sugars and higher in protein than other hays, and that cereal grain-based feeds should not be given to laminitic horses. Horses with previous episodes should only go out to mature pasture after their morning hay ration and should wear a muzzle.

Do grazing muzzles and drylot turnout actually work for prevention?

Yes, grazing muzzles and drylot turnout work for prevention because they directly reduce the horse’s intake of high-sugar spring grass. Kentucky Equine Research recommends grazing muzzles or drylot turnout for all horses at risk of laminitis, not just those with a confirmed diagnosis. The tools are simple, but they are effective.

Horses with a history of laminitis should not be out on pasture, or should go out only to mature pasture with a muzzle. The University of Illinois College of Veterinary Medicine advises that a previous episode means permanent caution, because the laminae never fully return to their original anatomy. A muzzle limits intake while still allowing movement.

Drylot turnout still delivers the circulation and body-weight benefits of turnout without the sugar load. Regular movement increases blood flow to the feet and helps maintain a healthy body condition score. Owners should make dietary transitions slowly rather than abruptly, which means a muzzle or dry lot is part of a system, not a one-off fix.

How can Equine Salt Therapy fit into a laminitis-aware management plan?

Equine Salt Therapy fits into a laminitis-aware management plan as a supportive wellness layer for equine athletes and horses in recovery. The patented dry salt aerosol delivery system assists with high performance, rapid recovery and wellbeing by creating favourable conditions for equine athletes. The fifteen-minute treatment, recommended over three consecutive days, is natural, non-invasive and reduces reliance on medically important antibiotics.

Equine Salt Therapy is the publisher of this article and offers Licensed Business Opportunities and Master Licenses for Equine, Poultry, Swine and Companion Animals. Territories are sold under License, and Master Licenses are available for various modalities under US Patent 11,497,593 and CA 3019046. Pricing runs from $110,000 to $1,000,000.

For horse owners, trainers and veterinarians managing laminitis-prone horses, the therapy is not a replacement for pasture management, muzzles or veterinary care. It is a complementary tool that supports overall respiratory and recovery outcomes. The full scope of the platform is defined by the claims of each applicable patent, with details available at the Licensed Business Opportunities page. Ultisalt™ is the world leader in DSAT Dry Salt Aerosol Therapy for Animals we invented it in 2012 we patented it for the protection of the Animal Kingdom.

Key Takeaways

Laminitis is the second biggest killer of horses after colic, and spring grass is a leading trigger.
Spring grass is high in nonstructural carbohydrates and low in fibre, and those sugars ferment in the hindgut.
Endocrinopathic laminitis may account for as many as 90 percent of cases, driven by insulin dysregulation.
Early warning signs include warm hooves, a sore or unwilling horse, and an increased digital pulse.
The safest grazing windows are early morning and evening, with spring and autumn access limited to about 90 minutes.
At-risk horses should be kept in a dry lot on hay until pastures mature, with mowing and muzzles used as support tools.
Equine Salt Therapy offers Licensed Business Opportunities and Master Licenses from $110,000 to $1,000,000 under US Patent 11,497,593 and CA 3019046.