What Temperature is Too Hot for Horses to Be Outside


Horses, majestic and graceful creatures, have been our companions for centuries. As responsible horse owners and caretakers, ensuring their well-being is paramount. One aspect of equine care that often goes overlooked is understanding the optimal temperature conditions for horses to be outside. While horses are hardy animals, extreme heat can pose health risks. 

In this article, we will delve into the question: “What temperature is too hot for horses to be outside?” and provide insights, guidelines, and tips to ensure your equine friends stay safe and comfortable during hot weather.

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Understanding Equine Thermoregulation

Before we determine the temperature range at which it becomes too hot for horses to be outside, it’s essential to understand how these magnificent animals regulate their body temperature. Horses, like all mammals, rely on various mechanisms to maintain a stable internal temperature. Their primary cooling mechanisms include:


Horses are prodigious sweaters. Sweating allows them to dissipate heat through the evaporation of sweat from their skin. When it’s hot, horses will sweat profusely to cool down.

Shade-Seeking Behavior

Horses are instinctively drawn to seek shade when they feel overheated. Providing access to shaded areas in their paddocks or pastures is crucial.

Water Consumption

Horses increase their water intake in hot weather to stay hydrated. Ensure they have constant access to clean, fresh water.

Determining the Optimal Temperature Range

The ideal temperature range for horses to be outside comfortably can vary depending on factors such as humidity, wind, and the individual horse’s health. However, as a general guideline, most experts recommend that horses can tolerate temperatures between 40°F (4°C) and 80°F (27°C) without any significant issues.

Factors Affecting Heat Tolerance


High humidity can impede the cooling effect of sweat, making it more challenging for horses to regulate their temperature. In humid conditions, it’s advisable to be cautious and limit strenuous activities during the hottest parts of the day.


A gentle breeze can provide relief by enhancing the evaporative cooling effect of sweating. Conversely, still air can exacerbate the discomfort of hot weather.

Individual Health: 

Horses with certain health conditions, such as respiratory issues or obesity, may be more susceptible to heat stress. Consult with a veterinarian to assess your horse’s specific needs.

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Signs of Heat Stress in Horses

To ensure your horses stay safe during hot weather, it’s crucial to recognize the signs of heat stress. Common signs include:

  • Excessive sweating or lack of sweating
  • Rapid breathing
  • Elevated heart rate
  • Lethargy
  • Flared nostrils
  • Muscle tremors
  • Dark urine

If you observe any of these signs, it’s imperative to take immediate action to cool your horse down and seek veterinary assistance if necessary.

Tips for Hot Weather Horse Care

Provide Ample Shade: 

Ensure that your horse has access to shaded areas in their paddock or pasture where they can escape the sun.


Monitor your horse’s water intake closely and ensure they have access to clean, cool water at all times.

Limit Exercise: 

Avoid strenuous activities during the hottest parts of the day. Schedule rides or workouts in the cooler morning or evening hours.

Sprinklers and Fans:

Consider using sprinklers or fans in the barn or near the pasture to help cool the air and reduce ambient temperatures.

Proper Grooming: 

Regularly groom your horse to remove excess hair and promote better airflow over their skin.

Feeding Strategies in Hot Weather

Maintaining proper nutrition is crucial for your horse’s well-being during hot weather. Horses have increased water requirements in high temperatures, so it’s essential to ensure they have access to plenty of fresh, clean water at all times. You may also need to adjust their feed regimen. For instance, consider reducing the amount of grain or concentrate in their diet and increasing their intake of forage, such as hay or pasture, which provides more water content and promotes better digestion. 

Electrolyte supplements can be beneficial, as they help replace the minerals lost through sweating. Consult with your veterinarian or equine nutritionist to develop a feeding plan tailored to your horse’s specific needs in hot weather, as individual factors like age, activity level, and health status play a significant role in determining the right approach.

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Fly Control and Heat

Flies and other pests can be more than just a nuisance to horses during hot weather; they can contribute to stress and discomfort. Flies are drawn to the moisture and sweat on a horse’s body, making them particularly bothersome during the summer months. Implementing effective fly control measures, such as fly masks, fly sheets, and fly repellents, can help reduce your horse’s irritation. 

Additionally, maintaining clean and dry living conditions in stables and paddocks can minimize fly breeding sites. By managing fly populations, you not only enhance your horse’s comfort but also reduce the risk of diseases transmitted by these insects, ensuring a healthier equine environment.

Nighttime Turnout: A Cooler Alternative

Nighttime turnout can be a practical solution for horse owners seeking to protect their animals from the scorching daytime sun and heat. By allowing horses to graze and exercise during cooler nighttime hours, you can mitigate the risk of heat-related stress. However, nighttime turnout should be approached with care. Ensure the area is well-lit to minimize the risk of injury, and check for potential hazards in the dark. 

Additionally, consider your horse’s individual adaptability to this schedule, as some may need time to adjust. Proper lighting, access to water, and a secure turnout area are essential components for making nighttime turnout a safe and comfortable alternative during hot weather.

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Importance of Regular Vet Check-ups

Regular veterinary check-ups are paramount for maintaining your horse’s health and well-being, especially during hot weather. High temperatures can exacerbate underlying health issues, and early detection is crucial. Your veterinarian can assess your horse’s condition, provide guidance on nutrition, and ensure vaccinations and parasite control are up to date. 

They can also advise on specific measures to take during extreme heat, such as hydration protocols and monitoring for signs of heat stress. Regular check-ups establish a strong foundation for preventative care and allow for timely intervention if any health concerns arise, ultimately contributing to the longevity and vitality of your equine companion.

Emergency Preparedness for Heatwaves

Extreme heatwaves can pose serious risks to horses, necessitating a well-thought-out emergency plan. Develop a comprehensive strategy that includes provisions for rapid cooling, such as access to cool water and shaded areas, and consider having fans or misting systems on standby. Monitor weather forecasts closely and be prepared to adjust your horse’s routine or even evacuate them to a cooler location if necessary. 

Ensure you have a stocked first-aid kit tailored to heat-related issues and know the signs of heat stress. Communicate your emergency plan with stable staff or fellow horse owners to ensure a collective effort in safeguarding equine welfare during heatwaves. Being proactive and prepared can make a significant difference in mitigating the risks associated with extreme heat.

Cooling Methods for Hot Days

When temperatures soar, it’s essential to employ effective cooling methods to keep your horse comfortable and safe. Cooling blankets, often soaked in cold water, can be placed over the horse’s back to help dissipate heat. Misting systems or fans in the barn or pasture can provide relief by lowering ambient temperatures. 

Frequent hosing with cool water can aid in cooling down a hot horse, especially focusing on the neck and legs where major blood vessels are located. Ice packs or cold-water baths for the horse’s lower limbs can further aid in reducing heat-induced inflammation. These cooling techniques are particularly valuable after strenuous exercise or during heatwaves, allowing your horse to recover and remain healthy in challenging weather conditions.


As responsible horse owners, it’s our duty to prioritize the health and well-being of our equine companions. Understanding the ideal temperature range for horses to be outside and recognizing the signs of heat stress are critical components of equine care during hot weather. 

By following the guidelines and tips provided in this article, you can ensure that your horses remain comfortable and safe even in the heat of summer.


Can I leave my horse outside in hot weather if it has access to water? 

While access to water is crucial, it’s not the only factor to consider. You should also provide shade and limit strenuous activities during the hottest parts of the day to protect your horse from heat stress.

What is the best way to cool down a hot horse? 

To cool down a hot horse, hose it with cool (not cold) water, especially on its neck and legs. Allow the horse to drink water if it’s willing. Provide shade and a fan if possible.

Are certain horse breeds more tolerant of hot weather than others? 

Some horse breeds are more heat-tolerant than others, but individual variations also play a significant role. It’s essential to consider the specific needs of your horse regardless of its breed.

Can I use equine sunscreen to protect my horse from the sun’s heat? 

Equine sunscreen can help protect horses with light-colored coats or sensitive skin from sunburn, but it won’t reduce the temperature. Shade and proper care are more effective for heat-related concerns.

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