Effective Ways to Deter Annoying Horse Flies
Quick answer
- Keep your campsite clean. Horse flies love stinky stuff.
- Use traps. They’re surprisingly effective.
- Dress smart. Light colors and long sleeves help.
- Consider repellents. Some work better than others.
- Manage your water. Stagnant water is fly breeding ground.
- Be aware of your surroundings. Know when and where they’re worst.
What to check first (do this before you drive out)
Before you even think about packing the cooler, get a lay of the land.
- Land manager / legality: Who’s in charge here? Is it National Forest, BLM, State Park, or private? Different folks have different rules. Always check the official website or call ahead. Don’t get blindsided by a permit you didn’t know you needed.
- Access/road conditions: Can your rig handle the road? Is it paved, gravel, or just a suggestion of a track? Think about clearance, 4WD needs, and if it’s likely to be a mud pit after rain. I learned this the hard way once. Ended up pushing my truck more than driving it. Not ideal.
- Fire restrictions + weather + wind: This is non-negotiable. Check fire bans before you plan that campfire. Also, get the weather forecast. High winds can make flies less of a problem, but also make camping miserable. Rain is a mixed bag – good for some things, bad for others.
- Water plan + waste plan (Leave No Trace): Where’s your water coming from? Is it potable, or do you need to filter/treat it? How are you packing out all your trash, including food scraps? Horse flies can be attracted to decaying organic matter. LNT is key.
- Safety (wildlife, distance to help, comms): What critters share this space? Bears, snakes, whatever. Know the local wildlife. How far is the nearest town or ranger station? Cell service is often spotty out there. Let someone know your plans and expected return time.
Step-by-step (field workflow)
Alright, you’ve done your homework. Now let’s get set up and deal with these buzzing nuisances.
1. Choose your spot wisely: Look for areas with good airflow. Horse flies don’t love strong breezes. Avoid stagnant water or marshy areas if possible.
- Good: A clearing on a slight rise, with trees upwind.
- Mistake: Setting up right next to a slow-moving creek or swamp. That’s prime real estate for flies.
2. Set up your shelter: Get your tent or shelter up quickly. This gives you an immediate refuge.
- Good: Tent stakes firmly in the ground, rainfly on.
- Mistake: Leaving the tent flap open for too long while you fiddle with poles. That’s an open invitation.
3. Secure your food: Store all food, drinks, and scented items in bear-resistant containers or your vehicle. Don’t leave anything out.
- Good: Everything sealed up tight and out of sight.
- Mistake: Leaving a cooler slightly ajar. Flies are smart.
4. Manage your waste: Double-bag all trash, especially food scraps. Keep it sealed and store it with your food.
- Good: Odor-proof bags, stored securely.
- Mistake: Tossing food scraps into the bushes. That just attracts more bugs.
5. Deploy fly traps (if using): Hang commercial fly traps away from your immediate campsite, but within reasonable distance to draw them away.
- Good: Traps placed downwind of your camp.
- Mistake: Putting a trap right next to your picnic table. You’re just concentrating the problem.
Consider deploying a highly-rated horse fly trap to effectively draw these pests away from your immediate area.
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6. Apply personal repellent: Use EPA-approved repellents containing DEET, Picaridin, or oil of lemon eucalyptus on exposed skin.
- Good: Even application, reapply as needed.
- Mistake: Only spraying your arms and forgetting your neck or ankles. Flies find every gap.
Alternatively, a Picaridin bug spray offers effective, long-lasting protection against horse flies with a less greasy feel.
For robust protection, apply a DEET insect repellent to all exposed skin, ensuring comprehensive coverage.
7. Wear protective clothing: Light-colored, loose-fitting, long-sleeved shirts and pants are your friends. Tuck in your shirt and pants.
- Good: Covering up as much as possible, especially during peak fly hours.
- Mistake: Wearing dark, tight clothing. Flies are attracted to dark colors and can bite through thin material.
8. Maintain campsite cleanliness: Sweep out your tent regularly. Clean up any spills immediately.
- Good: A tidy camp is a less attractive camp.
- Mistake: Letting crumbs and spills accumulate inside or around your tent.
9. Use fans or screens: If you have a screen house or can set up a fan, it can help create a fly-free zone.
- Good: A gentle breeze from a fan can keep flies off you.
- Mistake: Expecting a tiny battery-powered fan to win the war. It helps, but it’s not a silver bullet.
10. Stay hydrated and fed inside: Eat and drink inside your tent or screen house if the flies are really bad.
- Good: Enjoying a meal without a dozen flies buzzing around your face.
- Mistake: Trying to eat a sandwich out in the open when the flies are at their worst.
Common mistakes (and what happens if you ignore them)
| Mistake | What it causes | Fix |
|---|---|---|
| Ignoring land manager rules | Fines, eviction, damaged reputation for campers. | Always check official websites or call ahead for permits, rules, and regulations. |
| Driving onto a muddy road | Getting stuck, vehicle damage, environmental damage from spinning tires. | Assess road conditions before driving. If in doubt, park and walk. |
| Leaving food or trash uncovered | Attracting flies, other wildlife, and making your camp a bug buffet. | Store all food and waste in sealed containers or vehicles. |
| Setting up camp near stagnant water | Creating a breeding ground for flies and mosquitoes. | Choose well-drained sites with good airflow, away from marshy areas. |
| Relying solely on one repellent | Incomplete protection, leading to bites. | Use a multi-pronged approach: clothing, repellent, traps, and campsite management. |
| Wearing dark or tight clothing | Attracting flies and making it easier for them to bite through fabric. | Opt for light-colored, loose-fitting, long-sleeved clothing. |
| Not reapplying repellent | Protection wears off, leaving you vulnerable to bites. | Reapply repellent according to product instructions, especially after sweating or swimming. |
| Not managing waste properly | Attracting flies and other pests, violating Leave No Trace principles. | Pack out all trash, especially food scraps, in sealed bags. |
| Not checking weather before leaving | Unexpected storms, high winds, or heat making camping miserable or dangerous. | Always check the forecast for your specific destination before you depart. |
| Assuming flies won’t bother you | Unpleasant camping experience, constant distraction, and painful bites. | Be proactive. Implement deterrents before the problem becomes overwhelming. |
Decision rules (simple if/then)
- If you see stagnant water nearby, then take extra steps to manage your waste and consider using more traps, because stagnant water is a fly breeding zone.
- If the forecast calls for high winds, then you might have fewer flies, but be prepared for a potentially less comfortable camping experience.
- If you are wearing dark clothing, then expect to be a bigger target for horse flies and consider changing.
- If you have an open food container, then seal it immediately to avoid attracting flies and other critters.
- If you are planning to build a campfire, then check the current fire restrictions first, because bans can change daily.
- If you are setting up camp, then look for a spot with good airflow, because flies dislike wind.
- If you are going to be hiking or active, then apply repellent to all exposed skin, because flies can find any uncovered spot.
- If you are packing out trash, then use double-bagging for food waste to minimize odors, because strong smells attract flies.
- If you are in a known horse fly hotspot, then consider bringing specialized fly traps, because they can be very effective when used correctly.
- If you plan to swim, then reapply repellent after you get out, because water washes it off.
- If you are in bear country, then store your food and waste securely, because bears and flies are both attracted to food.
If you find yourself in a known horse fly hotspot, bringing specialized fly traps can significantly reduce their numbers around your camp.
FAQ
Q: What’s the best time of day for horse flies?
A: They are usually most active during daylight hours, especially when it’s warm and humid. Early morning and late afternoon can be peak times.
Q: Are there natural repellents that actually work?
A: Some essential oils like citronella, eucalyptus, and peppermint show some repellent activity, but they often need frequent reapplication and may not be as effective as DEET or Picaridin for serious fly problems.
Q: Will bug spray keep them away completely?
A: No single method is foolproof. Repellents help, but combining them with clothing, traps, and campsite management offers the best defense.
Q: What’s the deal with those big fly traps?
A: They often use a combination of heat, CO2, and sticky surfaces or bags to lure and trap flies. They can be effective for reducing populations in an area.
Q: Can horse flies transmit diseases?
A: In the US, horse flies are not generally considered significant vectors of disease to humans, but their bites can be painful and annoying.
Q: My campsite is near a lake, will there be more flies?
A: Possibly. Horse flies often breed in moist environments, so areas near water or wetlands can have higher populations.
Q: Should I avoid camping during certain seasons?
A: Horse fly season varies by region, but they are typically most prevalent in the warmer months, from late spring through early fall.
Q: What’s the difference between a horse fly and a deer fly?
A: Deer flies are smaller than horse flies but share similar biting habits. They can also be a major nuisance in certain areas.
What this page does NOT cover (and where to go next)
- Specific campsite reservation systems or booking platforms.
- Detailed regulations on firearms or hunting.
- In-depth identification guides for every insect species.
- Advanced wilderness survival techniques beyond basic campsite management.
- Localized weather forecasting for specific trails or remote areas.
- Information on specific medical treatments for insect bites.
Camping Bob has spent over 20 years camping across the US — from BLM dispersed sites in the Southwest to KOA campgrounds in the Pacific Northwest. He writes practical, no-nonsense guides to help fellow campers get outdoors with confidence.