It’s 10 p.m. in late August. Something big is battering your porch light, about an inch long and brown and yellow, and it sounds like a small drone. A few nights later one gets into the kitchen. That is almost certainly a European hornet (Vespa crabro).
For non-aggressive wasps I've had great luck spraying nests with this Spectracide wasp remover in the evening. For a nest up high in an eave, soffit, or tree, this Gotcha pole adapter clamps onto the can so you can spray from the end of an extension pole and treat the nest from 10+ feet away instead of standing right under it. And for anything aggressive I wear this ridiculous-looking upper torso beekeeping suit and keep my distance. It seems silly, but trust me, I learned the hard way.
The European hornet is the only true hornet that is widely established in North America. It is large and loud, and unlike nearly every other wasp it keeps flying after dark. Away from its nest it is less aggressive than it looks. Near the nest it is a different story, and its habit of nesting inside walls and attics is why homeowners end up having to deal with it.
This guide covers how to identify a European hornet, how to tell it apart from the insects it gets confused with, how its colony works through the year, how dangerous it really is, and what to do if you find a nest on your property.
The European hornet is a social wasp in the genus Vespa, the group of roughly 22 species that are the only insects entomologists call “true hornets.” It is native to Europe and parts of Asia. It reached North America in the mid-1800s, probably carried to the New York area in shipping, and has since spread across most of the eastern United States and into southeastern Canada.
Its US range now runs roughly from New England south to Georgia and the Gulf states, and west into the Great Plains. If you live east of the Rockies and see a true hornet, this is almost certainly the species. It is not established on the West Coast.
The common name confuses people because the insect most Americans call a hornet, the bald-faced hornet, is not a true hornet at all. It is a black-and-white aerial yellowjacket. Our hornet wasp guide explains in more detail how hornets fit in with other wasps.
Look for these features, ideally from a few feet away or through a window:
Behavior is a strong clue too. If a large wasp is hitting a lit window or porch light after dark, it is very likely a European hornet, because few other wasps are active at night.
Several insects get mistaken for the European hornet, and the right response differs for each.
| Insect | Size | Color | Key differences |
|---|---|---|---|
| European hornet | ¾–1⅜ in | Brown and yellow, reddish legs | Social; nests in cavities; flies at night |
| Cicada killer | 1–1⅝ in | Rusty-red thorax, black abdomen with yellow bands | Solitary; digs burrows in the ground; active by day only |
| Yellowjacket | ½–⅝ in | Bright black and yellow | Much smaller; scavenges food and drinks |
| Bald-faced hornet | ⅝–¾ in | Black and white | Builds an exposed football-shaped nest in trees or on eaves |
| Yellow-legged hornet (Vespa velutina) | ¾–1 in | Mostly dark brown-black, one orange band near the tip, yellow leg tips | Invasive; detected in Georgia in 2023; report sightings |
| Northern giant hornet (Vespa mandarinia) | 1½–2 in | Large orange head, dark thorax, banded abdomen | Declared eradicated from the US in December 2024 |
The cicada killer causes the most confusion. Both are big, both appear in late summer, and both look orange-brown in flight. The quickest way to tell them apart is location. Cicada killers hover over lawns and dig holes in bare soil, while European hornets come and go from a hole in a tree, wall, or eave and may show up at your lights at night.
If what you are seeing is dark with a single orange band and bright yellow feet, especially in the Southeast, it could be a yellow-legged hornet. That species is a serious threat to honey bees. Take a photo if you can do it safely and report it to your state department of agriculture or cooperative extension office. Our Asian wasp guide and murder wasp guide cover both invasive Asian hornets in detail.
The European hornet is one of very few social wasps that forage after dark. On warm nights, workers keep hunting and collecting food well after sunset, and they navigate partly by light. Bright artificial lights confuse them, which is why they:
This matters for homeowners in two ways. First, a hornet buzzing around a lamp at night is usually lost, not attacking. Turn the light off, open a door to the outside, and leave a porch light on to draw it out. Our guide on how to get a wasp out of your house walks through the options. Second, the usual advice to treat wasp nests at night does not work well with European hornets. More on that below.
European hornets are predators. Workers catch large insects, chew them into a paste, and carry them back to feed the larvae. Their prey includes:
Adults mostly fuel themselves on sugar. They drink tree sap and nectar, and late in the season they feed heavily on fallen and overripe fruit such as apples and pears. Unlike yellowjackets, they rarely bother picnics, soda cans, or garbage bins, so they are seldom a nuisance at outdoor meals.
Their diet makes them useful in a garden, since a single colony removes a large number of pest insects over a season. Beekeepers are the main exception, because a few hornets hunting at a hive entrance can stress a weak colony.
European hornets are known for stripping bark from shrubs and young trees. They chew off strips to get at the sap and to collect fiber for the nest. Commonly affected plants include:
The result is bare, tan-colored patches on stems and branches. If a hornet chews all the way around a branch, that branch can die back. Damage is usually limited to a few branches and rarely kills an established plant, but it can disfigure ornamentals. It is often blamed on rodents or deer until someone sees the hornets doing it. For other ways wasps can affect your property, see our wasp damage guide.
Like other social wasps in temperate climates, a European hornet colony lasts only one season.
Spring (April–May). A mated queen comes out of hibernation and looks for a sheltered cavity. She builds a small paper comb by herself, lays eggs, and raises the first workers alone.
Early summer (June–July). Once the first workers emerge, the queen stays inside laying eggs while the workers forage, hunt, and expand the nest.
Late summer to early fall (August–September). The colony peaks. Mature nests typically hold a few hundred workers, though large colonies can be bigger. This is when you are most likely to see hornets at your lights and to notice a nest. The colony starts producing males and new queens.
Fall (October–November). New queens mate and then leave to find a place to spend the winter, such as under loose bark, in rotting logs, or in protected spots in buildings. With the first hard frosts, the workers, males, and the old queen die. By early November in most of the range, an active nest is winding down or already empty.
Winter. Only the new queens survive. Old nests are not reused. Next spring each queen starts a new nest, sometimes in the same kind of location, which is why some houses see hornets year after year. Our wasp lifespan guide explains this yearly cycle across wasp species.
European hornets almost always nest in enclosed, dark cavities rather than out in the open. Common sites include:
The nest is made of brown, papery material. European hornets often use weathered or rotting wood, so the paper tends to look brown and brittle rather than the gray of a bald-faced hornet nest. In a tree cavity the outer envelope may be partial or missing, with the bottom open. Inside are several horizontal tiers of comb. See our guides to a wasp nest in a wall and a wasp nest in a tree for more on these situations.
Because the nest is hidden, people usually find it by watching the traffic. Steady hornet flights in and out of one gap in siding, a vent, a knothole, or an eave are the giveaway. Sometimes you will also hear a rustling or crackling sound inside a wall.
Away from the nest, European hornets are generally less aggressive than yellowjackets. A hornet visiting a lilac or hunting in your garden will usually ignore you unless you swat at it, grab it, or trap it against your skin. Many people get stung at night when a hornet that came in toward a light ends up in bedding or clothing.
Near the nest they defend themselves. Vibration, banging on a wall, blocking the entrance, or shining a light on the nest can bring out defenders. Because they fly at night and head toward light, approaching a nest with a flashlight after dark can provoke them rather than keep you safe.
The European hornet’s stinger is smooth, not barbed, so a single hornet can sting more than once. Because of the hornet’s size, each sting delivers more venom than a typical yellowjacket sting. Most people describe it as sharper and longer-lasting, with more swelling.
For someone who is not allergic, though, a European hornet sting is medically similar to other wasp stings. Expect:
First aid for a hornet sting:
Call 911 or use an epinephrine auto-injector immediately if anyone has trouble breathing, swelling of the face, lips, or throat, hives spreading beyond the sting site, dizziness, or a rapid pulse. These are signs of anaphylaxis and can develop within minutes. Multiple stings, a sting inside the mouth or throat, or a sting in a young child or someone with heart or lung disease also call for prompt medical advice.
For a full walkthrough, see our wasp sting treatment guide and our guide to allergic reactions to wasp stings.
Your options depend on where the nest is and how close it is to people.
A nest high in a hollow tree at the back of the lot, away from paths, play areas, and doors, is often best left alone. The colony dies on its own in fall, it won’t be reused, and in the meantime the hornets are eating a lot of garden pests. Keep people and pets away from the entrance and wait for frost.
Nests inside wall voids, attics, soffits, or chimneys should usually be handled by a licensed pest professional. There are several reasons:
Our wasp exterminator guide explains what a professional treatment involves, and our wasp nest removal guide covers the general principles for all nest types.
Anyone with a known sting allergy should never attempt nest treatment, even on a nest that seems small.
Once the colony is dead, either after treatment or after frost, wait a few days to make sure there is no more traffic. Then seal the entry gap, replace damaged siding or trim, and repair the cavity. Removing old nest material from a wall void isn’t always necessary, but it can help prevent problems with carpet beetles and other scavengers that feed on dead insects.
You can’t keep hornets out of the neighborhood, but you can make your house less attractive:
For broader strategies, see our guide to keeping wasps from building nests.
For most people, no more dangerous than other stinging wasps. The sting is painful, and the hornet can sting more than once, but European hornets are fairly calm away from the nest. The real risks are a nest inside a building, a person with a sting allergy, or someone who disturbs the colony and gets stung many times.
It was almost certainly drawn in by your lights. European hornets fly after dark and head toward bright light, so they come in through open doors and gaps in screens. If you see them indoors repeatedly, especially in fall, there may be a nest in a wall void or attic, and you should have it checked.
A cicada killer is a solitary wasp that nests in burrows in the ground, flies only in daytime, and has a black abdomen with pale yellow bands. A European hornet is a social wasp that nests in cavities with hundreds of nestmates, flies at night, and has a brown-and-yellow abdomen. Cicada killers are very unlikely to sting. European hornets will defend their nest.
No. The “murder hornet” is the northern giant hornet (Vespa mandarinia), a larger Asian species that was found in Washington State and British Columbia and was declared eradicated from the US in December 2024. The European hornet is a different species that has lived in the eastern US for more than 150 years.
No. The colony dies in late fall, and the nest is abandoned. New queens start fresh nests each spring. Some may pick a similar spot nearby, which is why sealing gaps after the colony dies is worth the effort.
Not just because you saw one. Lone hornets hunting in the yard are helping control pest insects. Act on a nest when it’s in or on your house, near a door or play area, or close to someone with a sting allergy. Otherwise, leaving it until fall frosts is a reasonable choice.
Activity peaks in August and September and drops sharply after the first hard frosts, usually in October or early November across most of the US. After that, the only survivors are the new queens hibernating out of sight until spring.
The European hornet looks intimidating. It’s an inch long, loud, and comes out at night. But it is mostly a predator of other insects, and it seldom bothers people away from its nest. Identify it by its brown-and-yellow coloring, broad head, and habit of flying to lights after dark. Leave distant nests to die off in fall, and call a professional for any nest inside your walls or attic. Never seal an active entrance or spray blindly into a cavity.
To learn about the other stinging insects you might find around your home, start with our complete wasp identification guide. Then compare the European hornet with its relatives in our guides to the hornet wasp, the Asian wasp, and the giant wasp.
This article is for general educational purposes. If you have a severe reaction to a sting, seek emergency medical care. For nests in or on a building, consult a licensed pest control professional.