Best Outdoor Fly Traps: Bait Bags, Reusable Traps and Sticks

The best outdoor fly trap is the RESCUE! Outdoor Disposable Fly Trap, a hanging bag whose water-activated bait draws hundreds of flies away from patios, trash areas and barns. RESCUE!'s reusable canister cuts waste for all-season use, the Big Bag version suits farms and stables, TERRO's Fly Magnet is the budget reusable jar, and BugBane's Fly Stick is the odorless sticky option for porches. Bait traps smell strongly by design, so hang them well away from where you sit.

Do Outdoor Fly Traps Work?

Bait traps work well outdoors, if you place them right. University of California IPM's pest note on flies says baited outdoor traps should be placed at some distance from occupied structures, and that they are effective when they are not competing with nearby garbage or animal wastes. In other words, a trap next to an overflowing trash can is fighting a losing battle.

The bait in most outdoor traps smells like rotting food on purpose, which is what lures house flies, blow flies and stable flies. That smell also makes them unpleasant near a patio, so the idea is to draw flies away from people, not to hang a trap over the dining table. Sticky traps have no odor but catch fewer flies, and they suit porches and doorways better than open yards.

Our flying insect guides cover indoor fly traps, wasp sprays and moth traps too, and the outdoor fly trap section has guides for specific spaces.

Where Outdoor Flies Come From

Outdoor flies breed in animal waste and decaying organic matter, according to UC IPM. The usual sources around a home are:

• Garbage cans and dumpsters: especially in summer, when food waste ferments quickly.
• Pet waste: dog droppings left in the yard for more than a few days.
• Compost: open piles with kitchen scraps, particularly meat or dairy.
• Livestock and poultry: manure, wet bedding and spilled feed around barns and coops.
• Dead animals: a dead bird or rodent can produce a burst of blow flies.

UC IPM advises setting garbage out for pickup at least once a week, even if the can is not full, and removing organic waste, including dog feces, at least weekly. Bagging garbage and pet waste before it goes into outdoor containers keeps flies from reaching it.

Which Outdoor Flies Traps Catch

Not every fly outdoors is a house fly, and the type matters for which trap works:

• House flies: the gray, striped flies around trash and patios; bait traps catch them in large numbers.
• Blow flies and bottle flies: metallic green or blue flies drawn to garbage, carrion and pet waste; bait traps work well on them too.
• Stable flies: look like house flies but bite, usually around ankles; they breed in wet hay, manure and rotting grass clippings, and bait traps catch some.
• Horse flies and deer flies: large biting flies near water and woods; scent-baited traps rarely catch many, so dark, raised sticky or canopy-style traps are used instead.
• Fruit flies and gnats: tiny flies around compost and fallen fruit; sugary or vinegar baits suit them better than meat-based attractants.

If biting flies around the legs are your main problem, look for wet organic matter to clean up, such as soggy grass clippings or a manure pile, since that is where stable flies breed.

Outdoor Fly Trap Types Compared

We compared outdoor fly traps on bait type, capacity, reusability, odor and what buyers report about catches and durability. Our sources were the makers' listings, Amazon's review digests and UC IPM guidance; we did not test the products. We left out cheap bait bags whose buyers mostly report catching nothing, and a bug zapper with mostly negative reliability and durability reviews.

Best Outdoor Fly Traps

RESCUE! Outdoor Disposable Fly Trap: Best Overall Outdoor Fly Trap

This 2-pack of hanging RESCUE! bags is the simplest way to pull flies away from a patio: open the bag, add water to activate the bait, and hang it, per the maker.

• The maker recommends hanging it at least 20 feet from living spaces because of the odor.
• Buyers find it effective, say it starts working right away and fills within a week, and consider it good value.
• The smell draws mostly negative reviews, and some bags fall apart before the season ends.

Choose it for the trash corner, the side yard, a kennel or the back fence line. Hang it in the sun, downwind of your seating area, and toss the whole bag once it is full.

OUR CHOICE

RESCUE! Outdoor Disposable Fly Trap, 2 Pack

DisposableStrong odor2 traps

Best for: Trash areas, yards and kennels

• ✓Effective right away, per buyers
• ✓Good value, per buyers
• ✓Disposable; no emptying
• −Strong odor, per buyers
• −Hang 20 feet from living areas, per the maker

Editor's Note

It pulls flies away from where you sit. Hang it downwind.

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Specifications (3)

Number of Pieces

2

Target Species

Fly

Recommended Uses For Product

Disposable Hanging Fly Trap

RESCUE! Outdoor Reusable Fly Trap: Best Reusable Trap

RESCUE!'s 3-pack of reusable canisters uses a food-based attractant; flies drown in the water inside, and you rinse and refill the trap for the next round, per the maker.

• The maker lists house flies, stable flies, bottle flies, flesh flies and horse flies, and says it is made in the USA.
• Buyers find it works almost instantly and catches many flies.
• Odor draws mostly negative reviews, and emptying a full trap is unpleasant.

Choose it for all-summer use around barns, kennels and large yards where you would otherwise go through many disposable bags. Buy refill attractant packets, and keep it at least 20 feet from living areas as the maker advises.

RESCUE! Outdoor Reusable Fly Trap, 3 Traps

ReusableStrong odor3 traps

Best for: All-season use with refills

• ✓Works almost instantly, per buyers
• ✓Reusable season after season, per the maker
• ✓Made in the USA, per the maker
• −Strong odor, per buyers
• −Emptying is unpleasant

Editor's Note

It cuts waste over a long season. Buy refill packets.

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Specifications (2)

Number of Pieces

3

Recommended Uses For Product

Outdoor

RESCUE! Big Bag Fly Trap: Best for Farms and Stables

For heavy fly pressure, RESCUE!'s Big Bag comes as 4 traps that the maker says can each catch up to 40,000 flies.

• It is meant for barns, stables and large yards, hung at least 20 feet from living spaces, per the maker.
• Buyers find it effective, especially on black house flies, and say it starts catching almost immediately.
• The odor is strong, as with all RESCUE! bait traps.

Choose it for livestock areas, horse barns and rural properties where small traps fill up in a day or two. Place traps along the edges of barns and paddocks, not inside stalls.

RESCUE! Big Bag Fly Trap, 4 Traps

DisposableUp to 40,000 flies4 traps

Best for: Barns, stables and farms

• ✓Up to 40,000 flies per bag, per the maker
• ✓Effective on house flies, per buyers
• ✓Starts catching quickly, per buyers
• −Very strong odor
• −Outdoor use only

Editor's Note

It suits livestock areas. Hang along barn edges, not in stalls.

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Specifications (3)

Number of Pieces

4

Style

Hanging Style

Target Species

Fly

TERRO Fly Magnet Trap: Best Budget Reusable Trap

TERRO's 1-quart Fly Magnet jar comes with a packet of poison-free bait that you mix with water, and its color and diamond lid are designed to draw flies in, per the maker.

• The maker lists house flies, barn flies and bottle flies, and sells replacement bait separately.
• Buyers find it highly effective, with catches starting within the first couple of hours.
• It smells like trash, buyers say, and is not suited to indoor use; durability is mostly negative.

Choose it for a small yard or a single trouble spot on a budget. Top up the water so the bait stays moist and flies stay submerged.

BUDGET PICK

TERRO Fly Magnet Reusable Trap with Bait

ReusableStrong odor

Best for: A budget reusable trap

• ✓Highly effective, per buyers
• ✓Catches within hours, per buyers
• ✓Reusable with refill bait
• −Smells like trash, per buyers
• −Durability mostly negative, per buyers

Editor's Note

It suits a small yard. Keep the bait moist.

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Specifications (3)

Style

1 Trap & 1 Bait

Material

Plastic

Target Species

Fly

BugBane Fly Stick: Best Odorless Trap for Porches

BugBane's 4 yellow Fly Sticks are bait-free sticky traps that hang or stand in an open box, with no odor, per the maker.

• The maker includes a small dish for adding your own bait, such as something sugary for fruit flies.
• Buyers find them effective; catch rates and stickiness are mixed, and some find the glue hard to clean off.
• They also catch gnats, mosquitoes and wasps, per the maker.

Because they work without bait, they are also the best fly trap for inside the house and outdoors alike: one pack can cover the screened porch and the mudroom. Choose them for porches, doorways, sheds and covered patios where a smelly bait trap would be unpleasant. Expect fewer flies than with a bait bag, and keep them out of reach of pets.

BugBane Fly Stick Sticky Traps, 4 Pack

Sticky sticksOdorless4 traps

Best for: Odorless use on porches

• ✓No odor, per the maker
• ✓Effective, per buyers
• ✓Optional bait dish included
• −Mixed catch rates, per buyers
• −Glue hard to clean off

Editor's Note

It suits porches and doorways. Expect fewer flies than a bait bag.

Check Price

Specifications (2)

Number of Pieces

4

Target Species

Fly, Gnat, Mosquito, Wasp

How to Place Outdoor Fly Traps

• Keep bait traps away from people: the leading makers recommend at least 20 feet from living areas, and downwind is better.
• Put them near the source: trash cans, dog runs, compost and manure piles, where flies already gather.
• Use sun and warmth: bait activates faster in warm spots, and flies are most active in sunny areas.
• Hang them low: about head height or lower, where flies travel.
• Remove competing smells: UC IPM notes traps work best when they are not competing with nearby garbage.
• Replace or empty them on time: a full trap stops catching and smells worse.

Garages are a special case: they are enclosed enough that bait odor builds up but often open to the outside. Our guide to the best fly traps for the garage covers sticky and light traps that suit that space.

Keeping Flies Away Outside

• Run a fan on the patio: a steady breeze makes it hard for flies to land.
• Cover food and drinks: and clear plates and spills right after eating.
• Clean grills and outdoor trash: grease and food residue attract flies for days.
• Fix door screens: UC IPM notes that well-fitted screens limit flies' access to buildings.
• Pick up pet waste daily in summer: it is one of the main breeding sites in yards.

Herbs such as basil, mint and lavender are often suggested as natural fly repellents, but there is little evidence they keep flies away from a patio. Removing food and waste, plus a fan and a trap placed away from where you sit, works far better.

Common Questions About Outdoor Fly Traps

Which One Should You Buy?

The RESCUE! Outdoor Disposable Fly Trap is the outdoor fly trap to buy for most yards. Its bait draws flies away from where you sit, it fills quickly and you throw the whole bag away when it is full.

Choose RESCUE!'s reusable canister for all-season use, the Big Bag for barns and stables, TERRO's Fly Magnet on a budget, and BugBane's Fly Stick where you cannot tolerate the smell. With any of them, take garbage out weekly and pick up pet waste so the traps are not competing with the source.

Before you buy, decide where you can hang a trap at least 20 feet from your patio and doors, since bait traps only work well with that distance.