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Cluster Flies

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Flies Be Gone Fly Trap
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Catch thousands of flies over an area of 50+ yards. One of the best outdoor fly bait traps on the market.

Cy-Kick Aerosol - 17.5 oz.
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Crack & Crevice Residual insecticide labeled for a wide variety of insect pests.

565 PLUS XLO - 20 oz. can
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A non-residual contact insecticide with a slight odor. It is labeled for just about every pest you could have a problem with, including bed bugs. (20 oz. can)

Flyweb Fly Light
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Fly light designed for indoor use. Compact size plugs directly into a standard electrical outlet.

Tempo Ultra WSP Insecticide
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Tempo Ultra WSP Insecticide is a wettable powder that targets infesting pests on indoor and outdoor landscapes

Tri-Die - 8 oz.
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Tri-Die Pyrethrin Dust Aerosol

Evergreen Pyrethrum Dust 1%
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Compare to Drione Dust! Evergreen is a botanical insecticide dust labeled for a broad range of insects including bed bugs.

Temprid Ready Spray
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The superior performance of Temprid combined with new Bayer Ready-to-Spray technology

Clean Air Purge III Metered Aerosol - 7.3 oz. can
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Metered aerosol for use in an aerosol dispenser for bathrooms, kitchens and other areas where flies and odors are a problem.

Alpine Ant and Termite Foam - 20 oz.
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Non-repellent ant and termite foam labeled as a Reduced Risk product by the EPA - safe and effective for termite control

Cy-Kick CS Aerosol
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Cy-Kick CS Aerosol - ready to use crack & crevice residual insecticide that keeps killing pests for weeks

CB-40 Aerosol - 17 oz. can
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Pyrethrin Flushing and Contact Insecticide with a fast kill. Especially safe for food handling areas.

EcoVia EC
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Created through an extensive research and development process, EcoVia EC is the green solution to almost all your insect problems.

MotherEarth 2% Py Contact Aerosol - 17.5 oz.
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MotherEarth 2% Py Contact Aerosol is a proven crack, crevice, spot, and space insecticide that targets a wide range of insects including ants, bedbugs, cockroaches, fleas and more.

Harmonix Insect Spray
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A biological insecticide that sets the new standard in residual performance.

Clear Zone Double Impact Farm Fly Spray
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Clear Zone Double Impact Farm Fly Spray is formulated with two active ingredients and a synergistic to provide a quick knockdown of flying insects and residual activity that lasts for hours.

Tandem Insecticide
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A microencapsulated insecticide with dual modes of action to control a wide range of pests both indoors and outdoors.


Some pests enter your home and may not cause any physical damage at all. This may seem like a relief, but these pests can be more stressful than any others. Cluster flies fall into this category. They are virtually harmless, but can gather in your home in the winter very large numbers and swarm around windows on warm days, trying to get back out.  Getting rid of cluster flies is similar to other nuisance insects, but it is helpful to know more about them can help you to know how to get rid of cluster flies.


Cluster Fly Identification and Life Cycle

Cluster flies are larger than the common housefly with a dull gray color and black markings. These flies can have multiple generations per year. The adult cluster flies search out sunny areas in the autumn to overwinter. This can be sunny sides of houses, south facing rock faces or cliffs, crevices and voids in dead or dying tree bark, or other manmade structures. When spring arrives, the females lay their eggs in the soil. The larvae hatch and seek out earthworms, which are their food source. 

Cluster Flies in the House

Cluster flies are harmless, but certainly unwanted in any home. They do not cause physical damage to structures, do not reproduce indoors, and do not carry any diseases. They will, however, gather in your home in very large numbers when the weather gets cool, similarly to Asian lady beetles. They will hide in wall voids or other crevices or cracks, and will swarm out during warm winter days, trying to find a way outside and “clustering” on windows. These flies are sluggish and easily swatted, but their large numbers make them very irritating. 

Cluster Fly Control – How to Get Rid of Them

As with many nuisance pests, mechanical exclusion (using physical barriers) is the best way to keep cluster flies and all other pests out of your home. Sealing all cracks around windows, doors, siding, utility pipes, behind chimneys, and all possible entry points with silicone-latex caulk or vine mesh screens can help to keep them out. Exterior applications of insecticides containing pyrethroids prior to the autumn overwintering can help prevent flies from overwintering on your home or entering your house. If flies have already entered your home, they may be in wall voids or other out-of-sight places. If they come out, vacuuming and sticky traps can help to cut back on fly populations. You can choose a pesticide formulated for use indoors. Pick one with pyrethrins and always read instructions before application.

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