The safest and most effective way to get rid of wasps and hornets is to treat their nest directly with an aerosol insecticide at dusk or dawn, when the colony is inside and relatively calm. But the right approach depends on what species you’re dealing with, where the nest is located, and how large it’s grown. A small exposed paper wasp nest on a porch eave is a straightforward DIY job. A yellowjacket colony inside your wall is not.
Identify What You’re Dealing With First
This step matters because it tells you where to look for the nest, how aggressive the colony will be, and how large it can get. The three types you’ll most commonly encounter in the U.S. are paper wasps, yellowjackets, and hornets, and they behave very differently.
Paper wasps are the least aggressive of the three. They’re slender with long dangling legs, and they build small, open-faced nests that look like an upside-down umbrella of honeycomb cells with no outer covering. You’ll find these under eaves, porch ceilings, deck railings, and other sheltered overhangs. Colonies are small, typically a few dozen wasps.
Yellowjackets are stockier, with bold black-and-yellow banding and a faster, more erratic flight pattern. They’re significantly more aggressive, especially in late summer when colonies peak. They nest in concealed spaces: underground burrows, wall voids, attics, and hollow structures. Their nests are enclosed in a papery shell, making them harder to spot. A mature colony can hold several hundred to over a thousand workers.
European hornets are the only true hornet established in the U.S. They’re noticeably larger than yellowjackets, with reddish-brown and golden-yellow coloring and distinctive teardrop-shaped markings on the abdomen. Their nests are tan-brown, relatively fragile, and typically built in concealed spots like hollow trees, barns, wall voids, and attics. A peak colony holds 200 to 400 workers, though larger nests can exceed 1,000. Baldfaced hornets, which are technically a type of yellowjacket, build large grey football-shaped nests hanging from tree branches or building corners.
Timing Makes the Biggest Difference
Treat the nest in early morning or after dark. During these hours, wasps and hornets are inside the nest and largely motionless. Spraying during the day means you’ll hit only a fraction of the colony, and the returning foragers will be agitated and defensive. You also want to wait for a calm evening with no wind, which helps the spray reach the nest entrance accurately.
Seasonally, early spring is the ideal time to act. Queens that survived winter are just starting new colonies, and nests are small with only a handful of workers. By late summer, colonies reach peak population and aggression. If you’ve waited until August or September, you’re dealing with a much larger and more defensive group.
How to Remove a Nest Yourself
Protective Clothing
Cover every inch of skin before approaching any nest. Wear long sleeves, long pants, closed-toe shoes, gloves, and a hat. Tuck pants into socks and sleeves into gloves so there are no gaps. Light-colored clothing is better because dark colors can provoke defensive behavior. A beekeeper-style veil or at minimum a hoodie with the drawstring tightened around your face protects your head and neck. When a wasp stings, it releases chemical signals that recruit the rest of the colony, so a single sting can quickly escalate.
Before walking away from the area, check your clothing carefully. Wasps can cling to fabric, and you don’t want to carry them into your house.
Treating Exposed Nests
For paper wasp nests and other visible, accessible nests, use a pressurized aerosol wasp and hornet spray. These products shoot a concentrated stream that lets you stand back from the nest, typically reaching 15 to 20 feet depending on the brand. The active ingredients in most commercial sprays are synthetic pyrethroids, which attack the insects’ nervous system on contact and knock them down within seconds.
Stand as far back as the spray allows and aim directly at the nest entrance. Saturate the nest thoroughly for several seconds. Don’t spray and run immediately. Hold your position and keep spraying until the can’s stream has fully coated the nest. Walk away calmly (don’t swat or flail if a wasp flies near you) and return the next day. If you see activity, treat again that evening. Once there’s no movement for 24 hours, you can knock the nest down with a long stick or scraper and dispose of it in a sealed bag.
Treating Ground Nests
Yellowjackets frequently nest underground, using old rodent burrows or gaps in landscaping. The approach is similar: wait until dusk, then apply aerosol insecticide directly into the entrance hole. After spraying, place a bowl or brick over the entrance to trap returning stragglers. Insecticidal dust is also effective for ground nests because workers track it deeper into the colony as they move in and out. Apply the dust into the entrance and leave it undisturbed.
Never pour gasoline, light fires, or flood a ground nest with water. Gasoline contaminates soil and groundwater, fire is unpredictable and dangerous, and water rarely reaches deep enough to destroy the colony.
Treating Nests Inside Walls
Wall voids are trickier. You’ll see wasps entering and exiting through a gap in siding, a crack near a window frame, or a soffit opening. Insecticidal dust applied into the entry point works better than aerosol spray here because the dust disperses through the cavity. Do not seal the entry hole before the colony is dead. Trapped wasps will chew their way through drywall into your living space.
After the colony dies, nests inside walls present a secondary problem. Very large nests can contain enough dead insects to rot rather than simply dry out, leading to odors and moisture staining on interior walls. The insects may also have chewed away insulation to make room for the nest, creating gaps that cause drafts, heat loss, and condensation issues down the line. For wall nests, removal of the nest material itself (not just killing the colony) is often necessary to avoid these problems.
When to Call a Professional
Some situations aren’t safe or practical for DIY removal. Call a pest control professional if any of the following apply:
- You have a known allergy to stings. Even with protective clothing, the risk of anaphylaxis makes self-removal dangerous.
- The nest is inside a wall, attic, or other structural void. Accessing and fully removing these nests often requires opening up building materials, and a dead colony left in a wall can cause moisture damage and odor.
- The nest is large or in a hard-to-reach location. A hornet nest 30 feet up in a tree, or a yellowjacket colony that’s been growing all summer with hundreds of workers, presents real risk. Professionals have specialized equipment and experience with aggressive colonies.
- You’ve treated the nest and activity continues. Repeated failed treatments can make a colony more defensive and harder to approach.
Preventing New Nests
Once you’ve removed a nest, take steps to discourage new colonies from setting up in the same spot. Seal cracks and gaps in siding, soffits, and foundation walls. Repair torn window screens. Keep outdoor garbage cans tightly lidded, since yellowjackets are attracted to food waste, especially protein and sugary drinks. Pick up fallen fruit from trees.
In early spring, inspect your property for small starter nests. A queen building alone in April is easy to deal with: a quick spray or even knocking down the quarter-sized nest with a stick eliminates the colony before it grows. By the time you notice heavy wasp traffic in July, you’re months too late for easy prevention.
What to Do if You Get Stung
A normal sting reaction includes sharp pain, redness, and localized swelling that peaks within a day or two. Clean the area with soap and water, apply ice to reduce swelling, and take an over-the-counter antihistamine or pain reliever if needed. Unlike honeybees, wasps and hornets can sting multiple times because their stingers are smooth and don’t detach.
An allergic reaction is a different situation entirely. Symptoms of anaphylaxis start within minutes and include swelling of the throat and tongue, difficulty breathing or swallowing, wheezing, dizziness or fainting, and skin that turns pale, blue, or grey (on darker skin, check the palms and soles of the feet). If any of these signs appear, use an epinephrine auto-injector if available, call emergency services immediately, and lie down with legs raised. Do not stand or walk, even if symptoms seem to improve. A second dose of epinephrine can be given after five minutes if there’s no improvement.