Cold weather changes how horses use energy and burn calories, making winter one of the most critical times to evaluate and potentially adjust their nutrition program.
As temperatures drop, horses must burn more calories to maintain body temperature, and both internal and environmental factors can dramatically increase those caloric demands. Without proper feeding adjustments, horses can lose body condition gradually over the winter months—often before owners realize it’s happening under thick winter coats.
Understanding how winter weather affects calorie needs helps horse owners make smarter feeding decisions that support warmth, digestive health, and body condition.
Why Horses Need More Calories in Winter
In cold or inclement weather, horses burn more energy to maintain normal body function and regulate body temperature. Their bodies work harder to fuel an internal “furnace” that keeps them warm as temperatures drop. This increased energy use means horses need additional calories in winter to maintain body condition and overall health.
Environmental factors such as wind chill, rain, snow, and limited shelter can further raise calorie demands. Wet or windy conditions draw heat away from the body more quickly, forcing the horse to expend even more energy to stay warm and dry. The energy used to keep warm is energy that can no longer support other needs, such as maintaining body weight, muscle mass, or daily activity.
How Much Do a Horse's Calorie Needs Increase in Cold Weather?
Cold weather doesn’t affect every horse the same way, and calorie needs don’t increase at a fixed temperature. Instead, energy demands rise once a horse reaches the point where it must burn additional fuel to stay warm. Understanding when this happens—and what influences how much extra energy a horse needs—helps owners make informed feeding adjustments before weight loss and changes in condition occur.
How Lower Critical Temperature Affects a Horse’s Calorie Needs
A horse’s lower critical temperature (LCT) is the point at which the environment becomes cold enough that the horse must increase metabolic heat production to maintain a stable core body temperature. Once temperatures fall below this threshold, the horse begins burning extra calories to stay warm.
For a healthy, acclimated adult horse with a full winter coat, the lower critical temperature (LCT) typically falls around 18°F (-8°C) and can be as low as 5°F (-15°C) under ideal conditions. However, this threshold varies from horse to horse and is strongly influenced by factors that affect insulation and heat loss.
Once temperatures fall below a horse’s individual LCT, digestible energy needs increase by about 1% for every degree drop, meaning calorie requirements can climb quickly during prolonged or severe cold weather.
Factors That Affect Lower Critical Temperature and Calorie Needs
Several factors can raise a horse’s LCT, causing the horse to feel cold sooner and require additional calories.
Hair Coat
A thick, dry winter coat provides a horse’s primary insulation by trapping warm air close to the skin. Horses with clipped coats or thinner hair coats lose this natural protection. In these cases, the LCT can be much higher—sometimes even at 41°F to 50°F (5°C to 10°C).
Body Condition
Body fat offers additional insulation. Horses with a Body Condition Score below 4 lose heat more quickly and often reach their LCT at higher temperatures. These horses typically require increased feed and, in many cases, blanketing sooner than horses in moderate condition.
Wind, Rain, and Snow
Wind and precipitation significantly increase heat loss by stripping warmth from the hair coat. Wind chill makes cold temperatures feel even colder, while rain or snow flattens the coat and removes its insulating air layer. Wet hair pulls heat away from the body much faster than dry hair, forcing the horse to burn more energy to stay warm and dry.
Because of this, horses often tolerate very cold, dry conditions better than milder temperatures paired with rain and wind—especially when shelter is available. In wet, windy weather, calorie needs can rise quickly, even when temperatures are not extreme.
Blanketing
A properly fitted, dry blanket adds an extra layer of insulation and can lower a horse’s LCT. Research shows that blanketing horses with full winter coats can reduce hay intake by approximately 8% compared to unblanketed horses, reflecting the reduced energy needed to stay warm.
Why Forage Is the Foundation of Winter Calories for Horses
Forage supports warmth, digestive health, and steady energy throughout the winter. Forage should always form the foundation of a horse’s diet, and in winter, how much and how often forage is fed plays a critical role in keeping horses warm and meeting calorie needs.
When a horse eats hay, fiber is fermented in the hindgut by beneficial bacteria, producing heat that helps maintain body temperature in cold weather. As temperatures drop, increasing hay intake helps horses stay warm.
Forage feeding frequency matters, too. Offering hay at least three times per day—ideally free fed—keeps heat production consistent throughout the day and night. Because hay digestion produces internal heat, increasing forage should often come before adding grain or concentrates to a horse's diet when they need more calories in cold weather.
Most horses require about 1.5–2.5% of their body weight in forage each day, with higher needs as temperatures drop. Grass hay supports consistent intake, mixed hay adds moderate calories, and alfalfa can help horses that struggle to maintain weight. Even when increasing forage, managing starch and sugar intake remains essential for overall health.
Winter Feeding and Calorie Considerations by Horse Type
Not all horses need the same feeding adjustments in winter. Age, metabolism, living conditions, and overall health all influence how many extra calories a horse needs when temperatures drop. Understanding your horse’s specific needs helps you support body condition without overfeeding or creating digestive stress.
Hard Keepers
Hard keepers often struggle the most in cold weather because they burn calories quickly to stay warm. These horses typically need a higher overall calorie intake during winter, starting with increased forage and, when necessary, a more calorie-dense feed or an increase in feed amount. Close monitoring of body condition throughout the season is essential, as gradual weight loss can easily go unnoticed beneath a thick winter coat.
Tribute’s Synergize™ is a high-fat (13%), low-sugar and starch (NSC) horse feed for hard-keeping and hard-working horses.
Easy Keepers
Easy keepers usually need fewer calorie increases in winter than hard keepers, even in cold weather. Easy keepers typically maintain body condition well with increased forage alone, especially when they have a full winter coat, adequate shelter, and limited exposure to wind and rain.
Increasing hay intake—particularly lower-calorie grass hay—helps meet increased thermoregulation needs while reducing the risk of weight gain. Lower-NSC grain options such as Essential K ration balancer or Tribute® Kalm N EZ® help support vitamin and mineral needs without excessive calories.
Senior Horses
Senior horses may need extra winter calories, but dental health often limits how well they can chew and utilize hay. Poor dentition reduces forage intake and digestion, making it harder for seniors to stay warm and maintain weight.
Highly digestible forage options and senior-friendly feeds help support nutrient absorption and energy needs in older horses during the winter months. As dental efficiency and digestive function decline with age, seniors often need feeds that provide calories in an easier-to-chew and easier-to-digest form.
Tribute® Senior Sport is a textured feed formulated with 10% fat, 18% fiber, and lower sugar and starch to help support body condition, digestive health, and steady energy in senior horses when cold weather increases calorie demands.
Young, Growing Horses
Young horses require energy for growth, especially in winter. However, adding calories should not mean feeding excess starch and sugar. Balanced diets that provide adequate energy, protein, vitamins, and minerals support growth while minimizing digestive upset or unwanted behavior.
Tribute’s Growth Pellet is a low NSC (15%), higher fat (8%), high fiber (18%) feed specially formulated for young, growing horses beginning at 3 months of age, as well as pregnant and lactating mares that require more calories in their diet.
Horses Living Outdoors vs. Stalled
Shelter access plays a significant role in the amount of extra energy they need. Horses living outdoors typically burn more calories compared to stalled horses. Stalled horses may require fewer additional calories than horses living outdoors, but cold barn conditions may still significantly increase energy and calorie demands.
How Water Intake Directly Affects a Horse's Calorie Utilization in Winter
Water intake plays an important role in how effectively horses utilize feed during winter. When water intake is inadequate, gut motility can slow and forage intake may decrease. This can reduce hindgut fermentation, limiting both nutrient availability and the heat produced from forage digestion.
Cold weather can also lower water intake because horses are less inclined to drink icy water. Studies show that horses prefer lukewarm water, ideally between 45–65°F, and will drink more when the water stays within this range. Insufficient water intake during cold weather increases the risk of impaction colic and makes it harder for horses to maintain body condition.
Monitoring a Horse's Condition Through the Winter
Maintaining body weight through winter starts well before cold weather arrives. Horses should enter winter in a healthy body condition score (BCS) of 5–6. As fall pasture quality and quantity decline, supplementing with hay early helps prevent unnecessary weight loss before winter feeding demands increase.
However, visual checks alone aren’t enough once their winter coats grow in. Thick hair can hide weight loss or gain, so hands-on body condition scoring becomes essential. Feeling along the ribs, topline, neck, and tailhead gives a more accurate picture of a horse’s condition. Tribute’s Wellness System body condition scoring approach helps owners consistently evaluate changes and adjust feeding before problems develop.
Reassess body condition every 2–4 weeks throughout winter. Make calorie changes gradually to support digestive health and avoid sudden shifts. The goal is steady maintenance, not rapid weight gain, which can increase the risk of metabolic and laminitis in some horses.
How Tribute Can Help Support a Horse’s Calorie Needs in Winter
Meeting a horse’s calorie needs during winter requires more than simply feeding more, it requires feeding smarter. Cold weather increases a horse's energy demands, but how those calories are delivered matters just as much as the total amount.
Tribute Equine Nutrition offers a wide range of low-NSC feeds with varying fat and fiber levels to support different types of horses through winter while protecting digestive health and overall wellness. Whether you’re managing a hard keeper, supporting a senior horse, or feeding a young, growing horse, Tribute’s fixed-formula feeds provide consistent, safe, reliable energy from quality ingredient sources.
Tribute also offers free, personalized nutrition consultations to help horse owners build winter feeding plans tailored to each horse’s age, workload, body condition, and living environment. This individualized approach helps ensure calorie increases support warmth and weight maintenance—without unnecessary sugar or starch.
References
- Rutgers New Jersey Agricultural Experiment Station. (n.d.). Winter horse care: Well-fed for the winter. Rutgers Cooperative Extension. https://esc.rutgers.edu/winter-horse-care-well-fed-for-the-winter/
- North Carolina State University Extension. (2023, January). Winter feeding practices for horses. NC State Extension. https://polk.ces.ncsu.edu/2023/01/winter-feeding-practices-for-horses/
- Iowa State University Extension and Outreach. (n.d.). Increase hay intake during winter. Iowa State University. https://www.extension.iastate.edu/equine/increase-hay-intake-winter
