Seasonal Horse Care: Preparing Your Horse for Summer

Summer horse care starts with water, shade, fly control, and adjusting your ride schedule to avoid the worst heat. Get those four things right and you're ahead of most problems.

Quick Answer: Prepare your horse for summer by ensuring constant access to fresh water and shade, adjusting ride times to early morning or evening, implementing a solid fly control plan, and monitoring for signs of heat stress.

Summer riding is one of the best parts of owning horses. Long days, warm evenings, trails that are finally dry. But the heat brings real risks, and horses don't handle extreme temperatures as gracefully as we might assume. They generate massive amounts of internal heat during exercise and rely heavily on sweating to cool down. When that system fails, things go south fast.

How Do You Recognize Heat Stress in Your Horse?

Horses are actually excellent sweaters. Among the best in the animal kingdom, in fact. They can pour out impressive volumes of sweat to cool themselves through evaporation. The problem is humidity. When the air is already saturated with moisture, sweat sits on the skin instead of evaporating. The cooling system stalls.

The Heat Index for Horses

Add the temperature (Fahrenheit) to the humidity percentage. That number tells you how dangerous conditions are:

• Below 130: Horses cool themselves without much trouble.
• 130 to 150: Cooling efficiency drops. Monitor closely during exercise, give frequent breaks.
• 150 to 170: Sweating alone isn't enough. Cut exercise intensity. Provide active cooling with hoses and fans.
• Above 170: Dangerous. Skip strenuous exercise entirely. Horses face serious heat stroke risk.

That 85-degree day with 80 percent humidity? The index hits 165. That's far more dangerous than a dry 95-degree day. Humidity is the silent killer people underestimate.

Signs of Heat Stress

Know these. They can save your horse's life.

• Rapid, shallow breathing or heavy panting that doesn't resolve within 10 to 15 minutes of rest
• Heart rate that stays elevated well past the normal recovery window
• Excessive sweating, or worse, a sudden stop in sweating (anhidrosis)
• Stumbling, lethargy, or disorientation
• Dark, concentrated urine or decreased urination
• Skin that stays tented when pinched (dehydration)
• Rectal temperature above 103°F (normal is 99 to 101.5°F)

A horse that stops sweating is in immediate danger. Anhidrosis shuts down the primary cooling system entirely. If you see it, stop all exercise, hose the horse with cool water, scrape it off, and call your vet.

Hydration: The Foundation of Summer Horse Care

A resting horse in moderate weather drinks 5 to 10 gallons a day. In summer heat with exercise, that number can hit 20 to 30 gallons. Water is the single most important factor in keeping your horse safe through the hot months.

Keeping Your Horse Drinking

• Constant access to clean, fresh water. Check troughs multiple times daily. Summer water goes warm, algae-covered, and unappetizing shockingly fast.
• Keep it cool. Position troughs in shade. Add a block of ice on brutal days. Scrub troughs weekly to prevent algae. Insulated troughs help in some setups.
• Provide electrolytes. Horse sweat is hypertonic, meaning it contains higher electrolyte concentrations than blood. Horses lose serious amounts of sodium, chloride, and potassium through sweating. Electrolyte supplements replace those losses and stimulate drinking. Always offer plain water alongside electrolyte water so the horse can choose.
• Track intake. Know how much your horse normally drinks and notice changes. A sudden drop in water consumption can flag illness, dental problems, or water quality issues.
• Let hot horses drink. The old myth about hot horses and cold water has been debunked. Let your horse drink during breaks and after exercise. Early rehydration speeds recovery.

Salt: The Forgotten Essential

Sodium drives thirst. Without enough sodium, a horse may not drink adequately even when water is right in front of it. Every horse needs a salt block or loose salt year-round, but it's critical in summer.

A plain white salt block works for most horses. Some horses don't lick blocks enough to meet their needs, especially during heavy sweat losses. For those horses, add one to two tablespoons of loose table salt to the daily feed. Simple fix, big impact.

What Is the Best Way to Control Flies on Your Horse?

Flies aren't just annoying. They spread disease, cause skin irritation, create stress, and drive horses to injure themselves trying to escape the harassment. No single tactic works alone. You need layers.

Environmental Management

Kill them at the source. Fly larvae develop in manure and damp organic material.

• Remove manure from stalls daily and from paddocks at least twice a week. Compost piles away from the barn, or arrange regular removal.
• Eliminate standing water. Fix leaky troughs, drain puddles, clean up any spots where water pools. Mosquitoes and other flies love stagnant water.
• Clean feed areas promptly. Spilled grain and leftover hay are fly magnets.

Physical Barriers

• Fly masks protect eyes, face, and sometimes ears. Most horses tolerate them well. Check fit daily and remove regularly to inspect the skin and eyes underneath.
• Fly sheets are lightweight mesh covers for the body. Especially helpful for horses with sweet itch or thin, sensitive skin.
• Fly boots protect the lower legs from stable flies that target the legs and reduce stomping injuries.
• Fans in barns and run-in sheds create airflow that discourages fly landing and helps with cooling. Mount them securely out of reach and cover cords.

Chemical and Biological Controls

• Fly spray: Apply before turnout or riding. Permethrin-based products tend to last longer. Reapply after sweating or rain.
• Feed-through fly control: These supplements pass through the horse's digestive system and into the manure, preventing larvae from developing. Most effective when all horses on the property are treated.
• Fly predators: Tiny parasitic wasps (harmless to horses and humans) that kill fly pupae in manure before they emerge as adults. Released monthly. A popular and effective biological control when used consistently.
• Traps: Sticky traps, bag traps, and light traps knock down adult fly populations around the barn.

Adjusting Exercise for Hot Weather

Riding doesn't have to stop in summer. It just needs to get smarter.

Timing

Ride early morning or evening. Avoid midday. If your schedule only allows midday rides during a heat wave, shorten the session significantly and reduce intensity.

Intensity and Duration

Scale back during the hottest stretches. An hour of schooling becomes 30 to 40 minutes. Build in frequent walk breaks between efforts. Your horse won't lose fitness over summer if you manage workload intelligently.

Warm-Up and Cool-Down

Walk for 10 to 15 minutes before asking for faster gaits. This gives the thermoregulatory system time to activate. After riding, walk until breathing returns to normal. Then hose the horse with cool water, focusing on the large blood vessels along the neck and between the hind legs. Scrape the water off and hose again. This is important: standing water on the coat insulates rather than cools. Scraping makes the next application actually effective.

Monitoring Recovery

Heart rate should drop below 60 bpm within 10 to 15 minutes of stopping. Breathing should quiet to normal. If recovery is sluggish, the horse was overworked for the conditions. Adjust next time.

Pasture Management in Summer

Heat and hooves are hard on pastures. What you do in summer determines how your grazing looks in fall.

Rotational Grazing

Divide pasture into sections and rotate through them. Move horses when grass drops to 3 to 4 inches. Let resting sections recover to 6 to 8 inches before grazing again. This cycle keeps root systems healthy and maximizes regrowth.

Avoiding Overgrazing

During drought stress, supplement with hay rather than letting horses chew pasture down to dirt. Overgrazing kills grass roots, invites weed takeover, and creates bare spots that erode. A pasture grazed to the ground during summer may not recover for a full season.

Shade and Shelter

Every pasture needs shade. Trees are great. Run-in sheds are reliable. Without shade, horses can't escape peak heat, and heat stress risk climbs sharply.

No shade and no shed? Consider bringing horses inside during peak hours (roughly 11 a.m. to 4 p.m.) and turning out in the evening and overnight instead.

Mowing and Weed Control

Mow to a uniform height to encourage even regrowth and suppress weeds. Remove or treat toxic plants, because stressed, overgrazed horses are more likely to try plants they'd normally ignore.

Sun Protection and Skin Care

Horses with pink or white skin sunburn just like people. The muzzle, around the eyes, and the lips are the most vulnerable areas.

• Apply equine-safe sunscreen or zinc oxide to exposed pink skin before turnout.
• Fly masks with UV protection shield the face and eyes.
• UV-blocking fly sheets protect the body.
• Shade access lets horses manage their own sun exposure.

Summer is also peak season for skin conditions like rain rot, scratches (pastern dermatitis), and sweet itch. Regular grooming, clean living conditions, and quick treatment of any skin issues keep small problems from turning into big ones.

Barn and Stall Management

A poorly ventilated barn can be hotter than outside and trap ammonia fumes from urine. That's the opposite of a safe environment.

• Maximize airflow. Open every door and window. Use large fans for cross-ventilation. The goal is constant air movement through the barn.
• Consider misting systems in dry climates. They can drop barn temperatures several degrees.
• Clean stalls at least daily. Ammonia buildup intensifies in hot, still air.
• Adjust bedding. Straw retains more heat than shavings. Some owners switch to cooler bedding options during summer months.

Feeding Adjustments for Summer

Heat changes appetite and metabolism. A few tweaks keep things balanced.

• Keep forage as the base. Fiber fermentation does produce internal heat, but cutting hay too aggressively causes digestive problems. A modest reduction of 10 to 15 percent during extreme heat waves is generally safe.
• Reduce grain if you're riding less. Less work means less energy demand. Overfeeding grain in summer just adds heat production and unwanted weight.
• Soak hay or offer soaked beet pulp to add moisture to the diet and support hydration.
• Feed smaller, more frequent meals to reduce the metabolic heat generated at any one feeding and support steady gut function.

Trailer Safety in Summer

A parked horse trailer in direct sun can reach lethal temperatures in minutes. Hauling in summer demands extra caution.

• Travel during the coolest parts of the day.
• Open all vents and windows for maximum airflow.
• Stop every 2 to 3 hours and offer water.
• Never leave a horse standing in a parked, closed trailer.
• Wet the horse down before loading on extreme heat days.
• Plan routes to minimize total haul time.

Creating Your Summer Care Checklist

A daily checklist keeps everything on track, especially if multiple people handle barn chores:

• Check and refill water troughs (morning, midday, evening)
• Scrub troughs weekly; inspect for algae growth
• Apply fly spray and check fly mask fit
• Provide electrolytes with morning feed
• Confirm salt is available in each pasture and stall
• Monitor every horse for heat stress signs
• Adjust ride times and intensity to the heat index
• Remove manure from paddocks at least twice weekly
• Verify shade availability and pasture grass height
• Apply sunscreen to pink-skinned horses

Track your horse's hydration, weight, and overall condition through the My Horse feature to spot trends over time.

Frequently Asked Questions

Can I ride my horse in 100-degree heat?

It depends on humidity more than temperature alone. Calculate the heat index (temperature plus humidity). Below 150, riding with reduced intensity and frequent walk breaks is generally manageable. Above 150, cut back significantly. Above 170, skip strenuous exercise entirely. Always monitor recovery, and if your horse's heart rate doesn't return to normal within 15 minutes, the conditions were too much.

How much water does a horse need in summer?

A resting horse drinks 5 to 10 gallons daily in moderate weather. During summer heat and exercise, that can double or triple to 20 to 30 gallons. Keep water clean, cool, and always available. Provide salt and electrolytes to encourage drinking.

What is anhidrosis and how do I spot it?

Anhidrosis is the inability to sweat properly. A horse with anhidrosis will be hot and distressed but dry, while other horses around it are dripping sweat. The horse may breathe rapidly and have an elevated temperature. This is an emergency. Stop all exercise, cool the horse with water, and call your vet. Anhidrosis is more common in hot, humid climates and can develop gradually or appear suddenly.

Do fly predators really work?

Yes, when used correctly and consistently. Fly predators are tiny wasps that kill fly pupae in manure before they become adults. They work best as part of a layered program alongside manure management, fly spray, and physical barriers. Results aren't instant, but consistent monthly releases through the fly season produce a noticeable reduction in fly populations.

Summer should be enjoyable for both you and your horse. With smart preparation, consistent management, and attention to the details, you can ride through even the hottest months safely. For more seasonal care topics, explore the full blog, or use the Symptom Advisor if anything concerns you.

Last reviewed: March 2026

Sources

• Texas A&M AgriLife Extension. "Summer Horse Care." agrilifeextension.tamu.edu
• AAEP. "Hot Weather Tips for Horse Owners." aaep.org
• UC Davis Center for Equine Health. "Beat the Heat." ceh.vetmed.ucdavis.edu
• Merck Veterinary Manual. "Heat Stress in Horses." merckvetmanual.com
• Geor, R.J. & McCutcheon, L.J. "Thermoregulation and Clinical Disorders Associated with Exercise and Heat Stress." Compendium on Continuing Education, 1996.