10 Best Horse Fly Repellents 2026 in the United States

The Wondercide Outdoor Pest Control Spray is a natural, plant-based solution that uses cedar oil to kill and repel a wide range of insects, including flies, making it a reasonable choice for managing horse-flies and other pests in outdoor spaces. Its spray formulation attaches directly to a garden hose, allowing easy and quick application over large areas (up to 5,000 square feet), which is convenient for treating yards or pastures.

It is safe to use around pets, children, and even beneficial insects like bees, offering peace of mind regarding skin sensitivity and environmental impact. The spray does not require waiting after application to reenter treated areas, which adds to its ease of use. While it repels and kills many insects, its strength against horse-flies specifically may vary, as it is marketed broadly for several pests.

For those who prefer a natural, cruelty-free option without strong chemical smells, this product fits well but may require regular application to maintain effective pest control.

The Absorbine UltraShield EX Combo offers strong protection against a wide range of insects including flies, mosquitoes, ticks, and more, thanks to its active ingredients—pyrethrins, piperonyl butoxide, and permethrin—which are common and effective for insect control. This ready-to-use, water-based spray is designed specifically for horses, but also safe for use on dogs and around barns or premises. One big plus is its weatherproof UltraBond Technology, providing up to 17 days of insect protection even in challenging conditions, which helps reduce the need for frequent reapplications.

The liquid formula includes a citronella scent, which is pleasant and known to help repel insects. It also contains sunscreens and coat conditioners, helping to protect the animal’s skin from sun damage and keep the coat healthy. Since it's ready-to-use with no mixing required, the spray is easy and convenient to apply. However, because it contains permethrin, it should only be used on animals older than 12 weeks, and care should be taken to avoid over-application or use on sensitive skin.

Highly regarded in the horse community, this product is available in a large 160-ounce size that might exceed the needs of casual users, and it may be priced higher compared to simpler products. It is ideal for horse owners seeking reliable, long-lasting insect protection that also supports the animal's coat and skin health, especially in environments with heavy insect activity or outdoor conditions.

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.