15 Best Fly Sprays For Gnats of 2026 – Expert Picks
Gnats invading your home require a targeted spray solution. This guide details the top-rated 2026 fly sprays formulated specifically to eliminate these persistent pests.
By Pets Viora Editorial Team
Updated October 3, 2026
Gnats can be a relentless nuisance for pet owners, invading homes, barns, and outdoor spaces where our animals live and play. Finding an effective solution that is also safe for your pets and family is a top priority. That’s why we’ve compiled this comprehensive guide to the best fly sprays for gnats available in 2026. We’ve analyzed 15 products from leading brands like Farnam, HotShot, Raid and more, evaluating their formulas, application methods, and safety profiles to help you make an informed choice for your specific needs. Whether you’re dealing with fungus gnats around houseplants, swarms in the barn, or persistent flies in the home, this guide provides the insights you need. For more targeted solutions, check out our related guide on horse fly protection.
Our Top Best Fly Sprays For Gnats for 2026
Below is our interactive comparison table of the top 15 best fly sprays for gnats we researched this November. This table allows you to quickly compare key features, ratings, and other details side-by-side. Click on any product name to learn more and check current pricing.
Raid Flying Insect Killer 18-Ounce Aerosol Spray
This EPA-registered aerosol spray is formulated to kill a variety of flying insects on contact, including mosquitoes, flies, and wasps. It's intended for both indoor and outdoor use, with instructions for ventilation after application. Pet owners should note the active ingredients and follow safety precautions carefully.
Pros
- Kills a wide range of flying insects on contact.
- Suitable for both indoor and outdoor applications.
- EPA-registered formula.
- Includes specific instructions for use and ventilation.
Cons
- Contains petroleum distillates and requires careful handling around pets.
- Requires a two-hour treatment period with room evacuation before ventilation.
- Precautions needed to avoid spraying near fabrics and furniture.
Hot Shot HG-97430 Flying Insect Killer Aerosol
This aerosol spray tackles flies, mosquitoes, and other flying pests both indoors and outdoors. Its formula kills on contact and provides residual control on surfaces for up to four weeks, useful for treating areas where pets and insects interact.
Pros
- Effective against a wide range of listed flying insects including houseflies, mosquitoes, and wasps.
- Provides up to 4 weeks of residual control on non-porous surfaces.
- Suitable for both indoor and outdoor application, offering flexibility.
- Aerosol format allows for easy, broad-space spraying.
- Leaves a clean, fresh scent instead of a harsh chemical odor.
Cons
- Requires careful application with specific safety steps, including ventilation and vacating treated areas.
- Active ingredients, while low concentration, are insecticides; pet owners should ensure proper ventilation before pet re-entry.
- Primarily targets flying insects; not a broad-spectrum pest control solution.
Hot Shot HG-4470 Kitchen Bug Killer Spray
This botanical insecticide spray targets common kitchen pests like roaches, ants, and flies. Its formula, derived from botanical sources, is a point of appeal for pet owners looking for a non-toxic option. It's designed for use in kitchens, pantries, and food prep areas.
Pros
- Formulated with botanical insecticides, appealing for household safety.
- Reported by users to be effective at killing insects on direct contact.
- Designed for use in kitchens and food preparation areas.
- Specification indicates it meets USDA standards.
Cons
- User feedback indicates the spray has no significant residual killing effect, requiring direct contact.
- Some reviews note that it requires persistent and targeted application to be effective.
Farnam Repel-X Ready-To-Use Fly Spray, 32 fl oz
A versatile, no-mix insect repellent spray designed for horses and dogs. Its ready-to-use formula offers broad-spectrum control against flies, mosquitoes, ticks, and gnats, making it a convenient staple for barns and pastures during fly season.
Pros
- Ready-to-use formula requires no mixing for immediate application
- Broad-spectrum action repels and kills flies, mosquitoes, ticks, and gnats
- Suitable for multiple species including horses, dogs, and livestock
- Convenient 32-ounce spray bottle is ideal for regular use
Cons
- Effective protection period typically lasts three to four days, requiring frequent reapplication during peak season
STEM Botanical Insect Spray, 12 fl oz
This plant-based spray uses botanical oils to target ants, roaches, and flies both indoors and outdoors. It's designed to kill on contact and create a deterrent barrier, with many pet owners noting its relative safety around cats and dogs. However, the formula is oily and can leave slippery residues or stains on certain surfaces.
Pros
- Effective against common pests like ants, roaches, and flies.
- Plant-based, botanical formula considered safer for use around pets.
- Creates a residual barrier to deter pests.
- Well-reviewed for indoor and outdoor use.
Cons
- Oily formula can leave slippery, potentially stain-causing residues.
- May require multiple applications for larger pests like flies.
- Strong scent, though many describe it as pleasant.
BASF PT Alpine 16-Ounce Fly Bait Spray
An EPA-registered aerosol bait spray that attracts and kills common flies like house and fruit flies on contact. Its long-lasting formula works for up to 30 days and dries clear, making it a discreet option for use around homes and patios where flies are a nuisance.
Pros
- Effective against multiple fly species, including house flies and fruit flies.
- Long-lasting control reported by users, reducing the need for frequent reapplication.
- Dries clear and leaves no sticky residue, according to reviews.
- Versatile for indoor and outdoor application around doors, windows, and garbage areas.
Cons
- Some user reviews indicate it may not be a strong attractant from a distance; flies must land on the treated surface.
- Requires careful placement out of reach of pets and children, as with any pesticide.
- Not for use on fabrics, upholstery, or skin, limiting some application spots.
Wondercide Lemongrass Indoor Pest Control Spray
A plant-powered insecticide and repellent spray designed for indoor use around pets. It's formulated with essential oils like cedar and lemongrass to tackle a wide range of pests, from fleas and ticks to ants and roaches, while being safe for cats and dogs when used as directed.
Pros
- Uses natural, plant-based essential oils as active ingredients, avoiding harsh conventional pesticides.
- Effective against a broad spectrum of pests, including fleas, ticks, mosquitoes, ants, and roaches.
- Certified safe for use around dogs and cats when applied according to the instructions.
- Versatile application for treating carpets, furniture, baseboards, and pet areas like kennels.
- Made in the USA with cruelty-free ingredients and no artificial colors or fragrances.
Cons
- Requires regular, repeated application as a preventative measure, which may be less convenient than some alternatives.
- The 16-ounce size may be insufficient for large-scale or frequent infestations in bigger homes.
EcoRaider EcoVenger 16 oz Insect Control Spray
A plant-based, non-toxic spray targeting common household pests like fleas, roaches, and spiders. Its formula is certified safe for homes with children and pets, offering a fast-acting and preventive solution without harsh chemicals.
Pros
- Plant extract based and non-toxic formula.
- Certified safe for use around children and pets.
- Kills multiple pests including fleas, roaches, and spiders.
- Claims to kill eggs for lasting prevention.
- Compact 16 oz bottle with manageable dimensions.
Cons
- Lacks user reviews for performance verification.
- First available in 2017, may be an older product iteration.
Kate's Home & Garden Plant Spray & Sticky Trap Set
This dual-action set includes a spray and 12 sticky traps for indoor plant pests like gnats. It's a straightforward solution for pet owners looking to protect household plants without complex application. The compact, lightweight bottle is easy to handle.
Pros
- Combines a spray and multiple adhesive traps for a two-pronged approach.
- Compact bottle dimensions (approx. 2.4" x 9.9") allow for easy storage.
- Lightweight build (1.3 lbs) facilitates one-handed use.
Cons
- Specific active ingredients and safety data for pets are not detailed in the provided specifications.
- The spray's volume (16oz) is moderate, potentially requiring more frequent purchases for larger plant collections.
Zevo Flying Insect Spray, 30 oz
This insecticide aerosol targets common flying pests like flies, gnats, and mosquitoes on contact. Its formula is powered by rosemary and cornmint oils and is designed for indoor and outdoor use. It's positioned as a fast-acting option for pet owners dealing with flying insects.
Pros
- Formula uses rosemary and cornmint oils
- Kills a variety of flying insects on contact
- Designed for both indoor and outdoor use
- Claims to leave no messy residue
- Packaged in a multi-bottle set for ongoing use
Cons
- Must be sprayed directly on insects to be effective, requiring precise application
- Instructions specify not to apply on surfaces where food is stored or prepared, limiting some kitchen use
STEM 10-Ounce Plant-Based Bug Spray
This botanical insecticide targets common indoor pests like flies, mosquitoes, and gnats with a formula rooted in plant extracts. It's positioned as a safer alternative for homes with pets, offering a natural scent and no harsh chemical odors.
Pros
- Formulated with plant-based active ingredients
- Designed to be safe for use around people and pets when used as directed
- Has no added dyes, fragrances, or harsh chemical odors
- Effective for both indoor and outdoor use
- Multiple reviews confirm its efficacy against gnats and flies
Cons
- Some users report a residue that can be difficult to clean
- The formula is described as oily and not suitable for direct application on plants
- Performance can be inconsistent, with some users finding it less effective than other methods
EcoLogic HG-75029 Flying Insect Killer Spray
This aerosol spray uses essential oils like cornmint, cinnamon, and clove to kill flying insects on contact. It's marketed as a safer alternative for homes with pets, though its strong scent is a common note among users.
Pros
- Formulated with essential oils instead of harsh synthetic pesticides
- Considered safe for use around pets when directions are followed
- Effective against a range of common flying pests like flies and mosquitoes
- Kills targeted insects quickly on direct contact according to reviews
Cons
- No residual action; insects must be sprayed directly
- The strong scent of cloves and cinnamon can be overwhelming
- Some users report it is ineffective against certain pests like pantry moths
Raid Essentials Fly Gnat & Mosquito Killer Spray
This plant-based aerosol spray targets a range of flying insects like flies, gnats, and mosquitoes using essential oils. It's formulated to be safe around pets and children when used as directed, making it a consideration for households looking for family-friendly pest control.
Pros
- Plant-based formula with lemongrass and geraniol oils
- Marketed as safe for use around pets and children when used as directed
- Effective against a broad spectrum of flying insects including mosquitoes, flies, and wasps
Cons
- Aerosol spray format may not be ideal for all indoor spaces
- Relatively new to market (released 2021) with limited long-term user feedback
Wondercide Mosquito and Fly Aerosol Spray, 2-Pack
This two-pack of aerosol sprays is designed for pet owners seeking a plant-based insect repellent. It targets mosquitoes and flies, offering a convenient option for treating indoor and outdoor spaces where pets frequent.
Pros
- Plant-based formula may appeal to eco-conscious pet owners
- Aerosol format allows for quick and broad application
- Sold as a two-pack for extended use or multiple areas
Cons
- The 3.8-star rating suggests mixed user experiences
Kate's Garden Plant Insect Spray with Peppermint
This indoor plant spray uses peppermint and rosemary oils to target pests like fungus gnats and mites. It's a non-toxic option marketed as safe for homes with pets when used as directed. The 16-ounce bottle is designed for weekly application.
Pros
- Made with natural ingredients (peppermint and rosemary oil)
- Marketed as non-toxic and safe for use around pets when used as directed
- Versatile for both indoor and outdoor plant pest control
Cons
- Oil-based formulation may leave a residue on plant leaves
Best Fly Sprays For Gnats Buying Guide for 2026
1. Formula Type: Chemical vs. Natural/Botanical
The active ingredients in a fly spray are its most critical component. Traditional chemical formulas, often containing synthetic pyrethroids like permethrin (found in products like the Farnam Repel-X Fly Spray for Horses, Ready To Use), are known for their potent and long-lasting insecticidal action. They typically offer extended residual protection, sometimes up to four weeks, making them ideal for high-traffic barn areas or persistent outdoor infestations.
Conversely, botanical or natural formulas rely on plant-derived essential oils such as rosemary, peppermint, cornmint, or cinnamon oil (as seen in Wondercide – Indoor Pest Control Spray and EcoLogic Flying Insect Killer). These are generally considered a safer alternative for use around pets, children, and food preparation areas when used as directed. They work through contact and often have repellent properties, but may require more frequent application. Your choice will depend on the severity of the gnat problem, the specific environment (indoor kitchen vs. outdoor stable), and your comfort level with different ingredient types.
2. Intended Use Environment: Indoor, Outdoor, or Both
Not all sprays are created equal for every setting. Indoor-specific sprays, like Hot Shot Kitchen Bug Killer 14 Oz or Kate’s Garden Plant Spray, are formulated to be safe for use in enclosed spaces, often with less potent odors and ingredients deemed safe for surfaces where food is prepared. They may also be designed to target pests common indoors, like fruit flies and fungus gnats.
Outdoor and barn sprays, such as BASF PT Alpine Fly Bait, are built for wider coverage, longer residual action, and to withstand environmental factors like sunlight and moisture. Many products, including Raid Flying Insect Killer and Hot Shot Flying Insect Killer, 15 Ounces, are explicitly labeled for both indoor and outdoor use, offering versatility. Always check the label to ensure the product is suitable for your intended application area to ensure both effectiveness and safety.
3. Target Pests and Effectiveness Spectrum
While this guide focuses on gnats, many sprays offer broad-spectrum control. It’s beneficial to choose a product that also targets other flying insects prevalent in your area, such as houseflies, mosquitoes, fruit flies, or moths. For example, STEM Bug Spray Kills Flies, Mosquitoes, Gnats and Zevo Flying Insect Bug Aerosol Spray are formulated for a range of common flying pests. This multi-purpose approach can provide more comprehensive pest management. If your primary concern is fungus gnats affecting potted plants, a specialized product like Kate’s Garden Plant Spray that targets larvae in the soil may be the most effective solution.
4. Safety Profile for Pets and Family
This is paramount for pet owners. Carefully read the product label for specific safety instructions regarding animals. Some sprays are safe for direct application on horses, dogs, or livestock when used as directed (e.g., Farnam Repel-X Fly Spray for Horses, Ready To Use). Others are designed for environmental use only and should not be sprayed directly on animals. Look for phrases like “safe around kids and pets when used as directed” or “plant-powered.” Even with natural products, proper ventilation and adherence to label directions are crucial. If you have multiple species of pets or specific health concerns, consulting your veterinarian is always recommended before using any pest control product. For more insights on safe products, explore our guide on best natural fly sprays for horses.
5. Application Method and Convenience
Consider how the product is applied. Aerosol sprays (like most Raid and Hot Shot products) offer quick, broad coverage and are convenient for spot-treating flying insects. Ready-to-use pump sprays (like Wondercide or EcoVenger) provide more controlled application, which is useful for treating specific areas like plant soil, pet bedding (from a distance), or along baseboards. Concentrates that require mixing with water (like the concentrate version of Repel-X) can be more economical for large-scale or frequent use in barns and pastures. Your choice should align with the size of the area you need to treat and your preferred ease of use.
6. Residual Effect and Reapplication Frequency
The longevity of a spray’s effectiveness varies significantly. Some products, such as BASF PT Alpine Fly Bait, advertise residual action for up to 30 days, killing insects that come into contact with treated surfaces long after application. Others, particularly natural botanical sprays, work primarily on contact and as a repellent, requiring reapplication every few days or weekly for ongoing control. If you’re dealing with a heavy, continuous infestation, a long-residual product may be more effective and convenient. For occasional or light gnat problems, a contact spray used as needed might suffice.
Why You Should Trust Us
Our recommendations are the result of a meticulous, objective, and data-driven research process. We do not rely on manufacturer claims alone. Our methodology involves systematically comparing product specifications, active ingredients, and labeled safety information. We analyze feedback and experiences from a wide array of real pet owners across multiple retail platforms and forums to understand real-world performance and common concerns. Finally, we score each product against our published criteria, which prioritize effectiveness, safety for pets, value, and suitability for specific use cases. Our goal is to provide you with clear, transparent information so you can choose the best fly sprays for gnats for your unique situation with confidence.
Frequently Asked Questions
What is the best fly sprays for gnats for use around pets?
The safest options are sprays specifically labeled as safe for use on or around dogs, cats, or horses when used as directed. Botanical sprays using essential oils (like rosemary, peppermint) are often marketed as pet-safe alternatives. Always read the label carefully, as “natural” does not automatically mean non-toxic. Avoid direct spraying on animals unless the label explicitly states it is safe to do so, and ensure treated areas are dry before pets have access.
How do I get rid of fungus gnats in my houseplants?
Fungus gnats breed in moist potting soil. Along with allowing the soil to dry more between waterings, a targeted spray like Kate’s Garden Plant Spray for Insects & Getting Rid of Gnats can be effective. These sprays are designed to be applied to the soil surface to kill larvae and eggs. Yellow sticky traps can also help control the adult flying population.
Can I use horse fly spray on my dog?
Only if the product label explicitly states it is safe for use on dogs. Some equine sprays, like Farnam Repel-X, are formulated for use on both horses and dogs. Never assume a product is safe for a different species than listed. Using a product not labeled for dogs can lead to toxicity, as dogs may be more sensitive to certain ingredients (like permethrin in high concentrations) that are safe for horses.
What’s the difference between a gnat killer and a gnat repellent?
Insecticides (killers) are designed to eliminate gnats on contact or through residual action. Repellents are designed to deter gnats from entering an area or landing on a surface (or animal). Many products, especially botanical ones, combine both actions. For example, a spray might kill existing gnats on contact and its scent may repel new ones from arriving for a period.
Are the best fly sprays for gnats of 2026 safe for indoor air quality?
Indoor-specific sprays are formulated with this in mind, often using lower-odor formulas. Regardless, it is always advisable to ventilate the area well during and after application, follow the label instructions for indoor use, and avoid spraying near air intake vents. Natural oil-based sprays may still have strong aromas that some people or pets find irritating.
About the author
The Pets Viora Editorial Team researches, writes, fact-checks, and updates every buying guide on Pets Viora. We cover products for dogs, cats, fish, birds, reptiles, small pets, horses, and backyard poultry, and every guide starts with the animal and the problem it needs to solve, not with a best-seller list. Our recommendations are based on product specifications and sizing, safety information and recalls, and recurring patterns in feedback from real owners across multiple sources, scored against the criteria published on our How We Rank page. Brands can't pay for placement, and our guides are general information, not veterinary advice. Questions, corrections, or product suggestions: [email protected]