10 Best Horse Fly Repellents 2025 in the United States

Absorbine UltraShield EX is a robust horse-fly repellent that also targets over 70 other pests including mosquitoes, ticks, and fleas. One of its key strengths is its formulation; it is ready-to-use and water-based, eliminating the need for mixing before application. This makes it easy to apply on horses, dogs, and even on premises like barns. Additionally, the product boasts weatherproof protection for up to 17 days, which is enhanced by UltraBond Technology, making it effective even in varying weather conditions.

The inclusion of multiple sunscreens and coat conditioners adds value, ensuring the safety and skin sensitivity of the animals while also protecting them from the sun. Being made in the USA can be reassuring for some buyers concerned with product quality and manufacturing standards. On the downside, the large size of the container (128oz) might be cumbersome for some users, and its weight (8 pounds) could be a drawback for easy handling.

Despite its effectiveness, the duration of 17 days may require frequent reapplication, which might be less convenient for some users. The product’s dimensions are also relatively large, which might pose storage challenges. However, for those looking for a powerful and wide-ranging pest repellant that is easy to use and offers good skin protection, Absorbine UltraShield EX is a compelling option.

PYRANHA HP CONCENTRATE 2.5 GAL is a horse-fly repellent formulated with high-quality pyrethroids, known for their effectiveness against a wide range of biting insects. The product offers quick knock-down and long-lasting protection, making it suitable for controlling various pests like horn flies, deer flies, stable flies, face flies, midges, mosquitoes, and more. This broad-spectrum effectiveness is a significant strength, making it versatile for different environments where these insects are prevalent.

The formulation type is a concentrate, which means it needs to be mixed with water before use, allowing flexibility in adjusting the potency based on specific needs. One drawback is the need for proper dilution, which might be less convenient for some users compared to ready-to-use formulations. PYRANHA HP CONCENTRATE provides extended protection, although the exact length of time is not specified. The product's water resistance is beneficial, ensuring it remains effective even after exposure to rain or sweat.

Safety and skin sensitivity aspects are crucial, and while generally pyrethroids are considered safe for use, it is always recommended to test a small area first to prevent any potential skin reactions in horses. With a package weight of 10.682 kg and dimensions of 7 x 9 x 15 inches, the product is relatively large, which may require adequate storage space. Ease of application might require some effort due to the need for mixing, but once prepared, applying it should be straightforward. As a top-ranked product in horse-fly repellents, PYRANHA HP CONCENTRATE is a reliable choice for those looking for an effective and long-lasting solution to manage biting insects.

Farnam Tri-Tec 14 Fly Spray is a liquid insect repellent designed especially for horses, offering protection against flies, gnats, mosquitoes, ticks, and other pests. Its main active ingredient is Permethrin, which is known for effective insect control. The spray is notable for its long-lasting effect, providing up to 14 days of protection under ideal conditions, which is longer than many similar products. This makes it a good choice for horse owners looking for less frequent application.

The formulation includes coat conditioners that help maintain a healthy, shiny coat, which is a nice bonus beyond just repelling insects. The product is water resistant, but heavy rain or washing will require reapplication to keep the protection strong. Application is flexible: it can be sprayed over the body or wiped on the horse’s face carefully to avoid sensitive areas like eyes and nose. However, since it contains Permethrin, it’s important to follow safety instructions, especially washing hands after use and not applying it to horses meant for meat consumption.

The spray comes in a large 128-ounce refill size, which is economical for regular use, though it’s a heavy container that might be less convenient for small-scale users. Customers rate it highly for effectiveness and scent. While it generally suits all horse breeds and life stages, you should still monitor your horse for any skin sensitivity at first use. Farnam Tri-Tec 14 provides strong, long-lasting horse fly repellent protection that balances insect defense with coat care, making it ideal for those wanting reliable and less frequent treatments.