How to Get Rid of Stink Bugs (Fall Invaders)

Quick answer: Get rid of stink bugs by vacuuming or sweeping them into soapy water instead of squashing them, then keeping them out for good by sealing cracks around windows, doors, siding, and utility lines and screening vents. Exclusion is the real fix. Skip indoor sprays; for a heavy fall invasion, a licensed pro treats the exterior before they get in.

Every fall, homeowners across much of the U.S. suddenly find shield-shaped bugs clustering on sunny walls and slipping inside by the dozen. These are almost always brown marmorated stink bugs, an invasive species that does not bite, sting, or breed indoors, but does gather in large numbers to wait out winter in wall voids, attics, and window frames.

The good news is that stink bugs are a nuisance pest, not a structural or health threat. The bad news is that once they are inside the walls, they trickle out on warm days all winter and spring. This guide covers how to identify them, why they invade in fall, how to remove the ones already inside without releasing their odor, and, most importantly, how to seal them out. When the numbers are overwhelming, we also cover when a licensed pest control pro is worth the call.

How to identify a brown marmorated stink bug

Brown marmorated stink bugs (BMSB) are easy to recognize once you know the markings. Adults are roughly the size of a U.S. penny, with a distinctive shield shape and a mottled brownish-gray body. The two features that separate them from lookalikes are the alternating light-and-dark bands on the antennae and along the edge of the abdomen. They are strong, clumsy fliers and make a noticeable buzzing sound.

All of these fall invaders respond to the same prevention: exclusion and removal without crushing. If you are unsure what you have, the shield shape plus banded antennae is the reliable tell for the true brown marmorated stink bug.

Why stink bugs come inside in the fall

Stink bugs do not come indoors to feed or reproduce. During the growing season they live outside, feeding on fruit, vegetables, and ornamental plants. As days shorten and temperatures drop in early fall, adults look for a sheltered, protected place to spend the winter in a dormant state called diapause. To them, the warm, sun-facing wall of a house is indistinguishable from a cliff face or hollow tree, and any crack becomes a doorway.

They typically gather first on the south and west sides of a building that catch the most afternoon sun, then work their way into gaps around windows, doors, soffits, utility penetrations, and under siding. Once inside a wall void or attic they stay dormant, but a warm winter day or indoor heat can rouse them, which is why you see them wandering across a ceiling or window in January. Understanding this timing matters: the window to keep them out closes in early fall, before they have settled in.

The single most important fact about stink bug control: once they are overwintering inside your walls, there is no effective way to spray them out. The entire strategy is to physically remove the ones you can reach and seal the building so next year's wave cannot get in. Prevention beats reaction every time with this pest.

How to get stink bugs out of the house

Vacuum or sweep them, do not squash

Stink bugs earn their name from the pungent, cilantro-like odor they release from glands on their abdomen when crushed, threatened, or even handled roughly. Squashing one does not just smell; it can stain surfaces and may signal other stink bugs. The goal is calm, low-contact removal.

• Vacuum them up. A vacuum with a hose is the fastest way to collect large numbers. Because the odor can linger in the machine, use a shop vac or a vacuum with a disposable bag, or place a knee-high nylon stocking inside the wand as a removable trap. Empty it outside promptly.
• Sweep into soapy water. Knock or brush bugs directly into a jar or bucket of soapy water, which kills them quickly without releasing much odor. A mix of warm water and dish soap works well.
• Pick them up gently. For a stray one or two, coax them onto a piece of paper and shake them into soapy water or outdoors, rather than grabbing or smashing.

Avoid crushing them on carpet, upholstery, or painted walls where the odor and staining are hardest to remove. If you do get the smell on your hands, wash with soap and warm water.

Skip the indoor sprays

Spraying insecticide on stink bugs indoors is a common mistake. It does little to stop the invasion, because the bugs are streaming in from wall voids you cannot reach, and killing them inside the walls creates a different problem: dead insects in the voids can attract carpet beetles and other secondary pests that feed on them. Interior foggers and bug bombs are similarly ineffective against a pest that shelters deep in cracks. Physical removal plus exterior sealing is both safer and more effective.

How to keep stink bugs out for good

Exclusion, sealing the building envelope so bugs cannot enter, is the real solution and the step that pays off year after year. It is the same work whether you do it yourself or hire out, and it is best completed in late summer to early fall, before the invasion begins.

Seal entry points

• Caulk cracks and gaps around window and door frames, siding, trim, and where the chimney or roofline meets the wall. Use a good-quality exterior silicone or silicone-latex caulk.
• Seal openings where utility lines, pipes, cables, faucets, and dryer vents pass through exterior walls.
• Add or repair weatherstripping and install door sweeps on all exterior doors, including the garage's service door.
• Repair or replace torn window and door screens, and make sure screens fit tightly in their frames.
• Install tight-fitting screens over attic vents, gable vents, soffit vents, chimney caps, and exhaust outlets, common entry routes that homeowners overlook.

Reduce what attracts them to the walls

• Turn off or reduce exterior lights on fall evenings, since lights draw stink bugs toward the house. Swap white bulbs for warm-toned or yellow bulbs, and close blinds at night so interior light does not spill out.
• Trim vegetation, vines, and overhanging branches back from the walls and roof so bugs have fewer staging points.
• Move firewood, leaf litter, and yard debris away from the foundation.
• Check window air conditioners and seal gaps around them, or remove them before fall; they are a frequent entry point.

Outdoor and yard management

You cannot realistically eliminate stink bugs from the landscape, and you do not need to. The aim outdoors is simply to lower the pressure on the building. Keeping the perimeter clear of debris, managing vegetation against the walls, and reducing nighttime lighting all make the house a less inviting overwintering site. If you garden, stink bugs may feed on tomatoes, peppers, beans, and fruit trees during summer; row covers and routine handpicking into soapy water help protect crops without broadcasting insecticide across the yard.

A licensed applicator can apply a residual product to the exterior, around eaves, vents, window frames, and other likely entry points, timed for late summer or early fall. This exterior barrier, done at the right moment, is far more effective than anything applied indoors, but timing and the correct product make the difference, which is where professional help pays off.

DIY versus professional stink bug control

Most stink bug situations are manageable with removal and sealing. A professional becomes worth it when the invasion is heavy, when the entry points are hard to reach safely, or when you want the exterior treated correctly and on schedule.

A pro does more than spray. They inspect the exterior to find the actual entry points, treat the vulnerable zones with the right residual product at the right time in fall, and advise on the sealing work that produces lasting results. For a large, recurring invasion, that combination of correct timing and thorough exclusion is what finally breaks the yearly cycle.

When to call a professional and why

Call a licensed pest control company when stink bugs return in large numbers every fall despite your sealing efforts, when the likely entry points are on high or unsafe parts of the house, when bugs keep emerging indoors through the winter, or when you simply want the exterior treated professionally before the next wave. Because the effective treatment is a well-timed exterior barrier plus exclusion, a pro's timing and reach are exactly what a heavy infestation needs.

Find a stink bug control pro

Compare license-verified pest control companies near you and request a free quote. Want to budget first? See typical pricing in our pest control cost guide. If other fall invaders like spiders are coming in through the same gaps, our guide to getting rid of spiders covers the same exclusion approach.

Run a pest control company? List your business on PestPin or see how our pro plans work to connect with homeowners searching for stink bug control nearby.