STINGING INSECT GUIDE

European hornet

Identification, local timing in San Antonio and the Hill Country, risk profile, and exactly how we treat it.

Scientific name: Vespa crabro (Linnaeus, 1758) Common names: European hornet, brown hornet, giant hornet (though that name often gets mixed up with the Asian giant hornet — more on that later) Family: Vespidae (subfamily Vespinae) Status in the San Antonio / Boerne corridor: Not established in Texas. Check out our coverage page for help with identification, comparisons, and to clear up common confusion with local species.

At a glance #

Why this page exists #

European hornets aren’t found in Texas, but I get a lot of questions about them. There are two main reasons for this:

Residents in San Antonio often freak out over large brown-and-yellow wasps. Most of the time, they’re looking at a cicada killer, a queen yellowjacket, or—rarely—a stray wasp that wandered in from somewhere else. "Giant hornet" or "European hornet" often gets mistaken for the Asian giant hornet—the species that made headlines as "murder hornets" in 2020. Those who remember that media frenzy tend to view "giant hornets in America" as something to fear. It’s important to set the record straight.

This page aims to clear up confusion and help you identify the local species that might be causing issues.

Identification #

If you come across a European hornet outside its usual territory — like on some imported plants or in a shipping container — here's what to check for:

• Large size: workers are about 1 inch long, while queens can grow up to 1.4 inches. They’re larger than yellowjackets but smaller than the Asian giant hornet.
• Reddish-brown coloration overall, especially noticeable on the head and thorax. Most American wasps are black-and-yellow; the European hornet has a more brown-and-yellow look.
• Reddish wings that stand out — they’re not transparent like most wasps.
• Yellow abdomen with brown bands and characteristic teardrop-shaped brown markings at the back end.
• Deeply C-shaped indented eyes — this is a key feature of Vespa hornets.

Linnaeus first described this species in 1758 in Systema Naturae. You’ll find different color forms throughout its native Eurasian range, but these are considered informal regional variants, not formal subspecies.

Distribution — the actual range #

European hornets made their way to North America from Europe around 1840, landing first in the New York area. From there, they've spread across the continent.

• Found throughout the eastern United States, reaching as far west as the Mississippi River.
• Ranges north into the Great Lakes states, southern Ontario, and Quebec.
• Extends south to Louisiana and all the way to New Orleans.
• Documented as far west as the Dakotas, though mostly in scattered records.
• Particularly common in the Washington, DC area.

In 2010, we found some isolated nests in Guatemala. These were likely accidental introductions, not part of a larger, established population.

They haven't set up shop in Texas. We’ve seen a few specimens collected in Arkansas, which is the nearest established population, but they haven’t made a noticeable move into Texas. It’s puzzling why this is the case—habitat in East Texas seems suitable—but this species has stayed surprisingly non-invasive since it first showed up in the 1800s. According to ScienceDirect's Medical and Veterinary Entomology, V. crabro "is neither particularly abundant nor a pest in its new location." That’s quite different from other introduced wasps like German yellowjackets or European paper wasps, which have become real nuisances across the Americas.

Biology and behavior — for reference #

Annual cycle: Like other vespines, these colonies last only a year. A mated queen survives the winter, starts a new nest in spring, and raises her first brood by herself. Once the workers are ready, she shifts to laying eggs full-time.

Nest: These nests are usually found in dark, sheltered spots like hollow trees, attics, wall voids, old beehives, and barns. The paper they use has a brown color, thanks to the bark fibers, unlike the gray nests of baldfaced hornets. I’ve even heard of a few nests being built underground.

According to Penn State Extension, adult wasps sip nectar and tree sap. Workers hunt down larger insects like grasshoppers, flies, dragonflies, moths, and mantises, bringing them back to feed the larvae. They’ve also been known to target honey bees, making them a nuisance for beekeepers in Europe where they originally come from.

Tree girdling: European hornets have a knack for stripping bark from young deciduous trees and shrubs like lilac, birch, ash, dogwood, dahlia, rhododendron, and boxwood to get to the sap. I've seen this girdling cause serious damage, often killing young or ornamental plants. It's a unique behavior that sets them apart from our native North American wasps.

Worker policing — an unusual reproductive system: European hornets have a unique system. Instead of relying on queen pheromones to keep worker reproduction in check, they practice worker policing. The workers will actively seek out and destroy any eggs not laid by the queen. This behavior wasn’t fully understood until recently; older studies mistakenly thought it was all about pheromone control, like with other vespines.

Pheromones: The main alarm pheromone is 2-methyl-3-butene-2-ol. If a hornet gets killed close to its nest, this compound sets off aggressive behavior in other workers. Even materials like clothes, skin, or dead wasps that touch the alarm pheromone can cause a long-lasting attack.

Two unusual behaviors worth knowing #

1. They are nocturnal — the only wasp that primarily comes out at night in most of their territory.

European hornets are night owls. They’re drawn to artificial lights and can be a real hassle for homeowners. In Pennsylvania, they’re the only wasp species active at night. I've seen workers fly around and bang against lighted windows, which can look pretty alarming. It might seem like they’re trying to break in, but they’re just confused by the lights.

This nighttime foraging is pretty rare for vespines; most wasps are out and about during the day. European hornets have a unique advantage, targeting night-flying moths, beetles, and other large insects that other wasps typically ignore.

2. Their sting isn't as bad as people often say.

According to Purdue Extension, the Schmidt Pain Index gives the European hornet sting a rating of about 2.0, which is similar to a honey bee sting. Even though these hornets are large and look intimidating, their venom isn't as strong as other wasps'. A single sting hurts, but it's not a big deal for most people who aren't allergic.

The Asian giant hornet confusion ("murder hornets") #

This section is here because of what you’ve seen in the news lately, and I know customers will keep asking about it.

The Asian giant hornet (Vespa mandarinia) and the European hornet (Vespa crabro) are not the same. They belong to the genus Vespa (true hornets), but each is its own species.

• Vespa crabro (European hornet): This species has been around in eastern North America since the 1840s. You won’t find it in Texas. It’s not particularly dangerous and is rarely a pest.
• Vespa mandarinia (Asian giant hornet, "northern giant hornet," "murder hornet"): First spotted in Washington state and British Columbia in late 2019. There’s been a big eradication push for it. On December 18, 2024, the WSDA and USDA officially declared it eradicated from the United States.

What actually happened with "murder hornets" #

In December 2019, the Washington State Department of Agriculture found the first Vespa mandarinia in Whatcom County, making it the first detection in the U.S. A second one popped up in British Columbia, Canada. DNA tests indicated that these were two separate introductions from different countries.

Over the following years, WSDA and USDA conducted an intensive eradication program:

• October 2020: We found and destroyed the first nest inside a hollow alder tree at a Washington State University facility. We used carbon dioxide sedation, vacuum extraction, and sting-proof suits for safety.
• August–September 2021: Three more nests were identified and removed.
• 2022: We had no detections that year.
• 2023: Still no detections this year.
• 2024: No detections; we declared eradication on December 18.

After three years without a single confirmed sighting, the WSDA and USDA announced on December 18, 2024, that they had officially eradicated the species from Washington state and the entire United States. This marks the first time an invasive Vespa species has been successfully wiped out in North America.

Why this matters for Texas #

Asian giant hornets have never been found in Texas. There was a lot of panic on social media in 2020, with some claiming these hornets were spreading. In reality, they were only spotted in a small area of Whatcom County, Washington, and parts of British Columbia. Even the Louisiana State University's AgCenter has pointed this out, calling out those exaggerated claims about their presence beyond the Pacific Northwest.

Every sighting of a "giant hornet" in Texas since 2020 has turned out to be a misidentification of a native species. The most common culprits include:

• **Cicada killer wasp (Sphecius speciosus)** — check out guide 10. These guys are big, black-and-yellow, and you’ll see them most often in July and August. They're the most common mix-up we get.
• Mature queen yellowjacket — you’ll spot them in early spring. They’re large and black-and-yellow, but you’ll only see them briefly while they’re foundering their nests.
• Eastern carpenter bee — these are large and have a yellow thorax. They really do look like giant bumble bees.
• Tarantula hawk — these are very large, with a striking blue-black body and orange wings. You won’t miss them.

If you spot a "giant hornet" in Texas in 2026, it's almost certainly one of the local species, not a true Vespa. If you have a specimen or a clear photo, we’re happy to help identify it.

Risk to humans and pets #

If you come across a European hornet in Texas, it’s generally low to moderate on the sting scale. A single sting feels similar to a honey bee sting. These hornets aren’t usually aggressive unless you’re near their nest or a food source. They can sting without warning if startled, so it’s best to keep your distance. If you're allergic, take the usual precautions you would for any sting from the Hymenoptera family.

In our service area, the risk from European hornets is practically nonexistent. There simply isn't an established population here.

Treatment approach #

If we ever found a European hornet nest in our area (which is pretty unlikely), we’d handle it like we do with bald-faced hornets in hidden spots. We’d use a dust formulation applied at the nest entry point during dusk or dawn. We’d wear a full bee suit with sealed eye protection. After that, we’d wait 24-48 hours before removing the nest and keep an eye on the area afterward.

When homeowners in San Antonio or Boerne report "giant hornets" or "European hornets," the first step is identification. More often than not, they're actually seeing a native species like a cicada killer, paper wasp queen, or carpenter bee. We focus on treating the species that's really present. If I tell a customer they have European hornets when they actually have cicada killers, it sets them up for incorrect expectations and ineffective treatment.

Odd, funny, and genuinely true #

• European hornets fly at night and crash into windows. People in Pennsylvania and Maryland who keep porch lights on in late summer report sometimes 10 or more European hornets beating themselves against lighted windows. The sound is loud enough to startle people inside, and the force of the attacks gives the impression the hornets are trying to enter the house. They are not — they are simply attracted to the light, like moths.
• They girdle ornamental shrubs. European hornets strip the bark off lilac, dogwood, ash, and other ornamental woody plants to feed on the sap underneath. The effect can kill young plants. This is one of the few American examples of vespid wasps causing direct horticultural damage.
• Asian giant hornets were declared eradicated from the US on December 18, 2024. After five years of monitoring and eradication work, three years of zero detections, and significant media attention, the species is no longer present in North America. The eradication program required coordination across federal, state, and local agencies, plus citizen scientist participation — half of confirmed detections came from public reports.
• The Entomological Society of America has officially renamed the species to "northern giant hornet" in their Common Names of Insects list, moving away from "Asian giant hornet" (geographic) and "murder hornet" (sensational). This change was made in 2022 in part to reduce association of the species with anti-Asian sentiment that surfaced during the 2020 media cycle.
• **A package containing live larvae and pupae of Vespa mandarinia was intercepted at a US port of entry sometime before 2010**, according to USDA entomologist Allen Smith-Pardo. People sometimes ship live wasp larvae for use as food or in traditional medicine — this is illegal but documented to occur. One theory of how the 2019 introduction occurred involves a mated queen overwintering inside a shipping container.
• ***Vespa crabro* has been continuously present in North America for about 185 years** — since the 1840s — without ever becoming a serious pest. This is unusual for an introduced vespid; most introduced wasps become invasive nuisances. The European hornet is a rare counterexample.
• The species was first described by Carl Linnaeus in 1758 in the 10th edition of Systema Naturae — the foundational work of modern biological taxonomy. Vespa crabro is one of the original "type specimens" that anchored Linnaean classification of Hymenoptera.
• **Worker policing in *Vespa crabro***: workers actively destroy eggs that were not laid by their queen. This is unusual among vespines, where most species use queen pheromones to suppress worker reproduction. Lab data show the queen averages 2.31 eggs per day, but only 1.63 cells are constructed per day — meaning excess eggs are being destroyed, primarily by other workers.
• Minerals found in nest walls include titanium, iron, and zirconium — incorporated from soil during paper construction. The nest cement that holds the paper combs together is also water-resistant, allowing nests to survive in damp locations. Average dry weight of a finished nest is about 81 grams (2.85 ounces).
• Asian giant hornet stings are far more dangerous than European hornet stings. The Asian species causes 30–50 deaths annually in Japan, with cases of multiple-organ failure documented. Single stings on the skin are rarely fatal even for V. mandarinia (allergic individuals excepted), but severe envenomation from multiple stings can be lethal. This was the basis for the "murder hornet" label — and it is genuinely warranted for V. mandarinia. It was never warranted for V. crabro.

Common questions customers ask #

• Yes, there are European hornets (Vespa crabro) in Texas, including areas around San Antonio.
• The European hornet is about 1 inch long and has a brown and yellow pattern, while the Asian giant hornet (Vespa mandarinia) can reach up to 2 inches and has a more distinct orange-yellow face.
• No, murder hornets have not been officially documented in Texas.
• If you saw a giant hornet in San Antonio, it was most likely a European hornet, as Asian giant hornets are rare here.
• European hornets are larger and more aggressive than cicada killers (Sphecius speciosus), which are solitary and primarily hunt cicadas.
• Yes, European hornets can be dangerous, especially if provoked, as they can sting multiple times.
• The murder hornet has not been completely eradicated but is being monitored and controlled in areas where it's been found.
• If you see a giant wasp, keep your distance and contact a pest control expert for identification and removal.

We’ve gathered information for this guide from various reliable sources. These include the Wikipedia entry on European hornets, NC State University Extension, and the Penn State University Extension species guide. I also looked at the Smith-Pardo et al. 2020 taxonomic revision in Insect Systematics and Diversity, along with the USDA Yellowjackets of North America handbook by Akre et al. from 1981 (#552). I referenced the Discover Life account for Vespa crabro, an overview from ScienceDirect's Medical and Veterinary Entomology, and the joint announcement by WSDA/USDA on December 18, 2024, regarding the eradication of Vespa mandarinia in the U.S. The history of the Asian giant hornet follows the timeline documented by the Washington State Department of Agriculture from 2019 until the eradication declaration. For information on the so-called murder hornets, I consulted HistoryLink's page on Vespa mandarinia eradication and announcements from APHIS/USDA.

Frequently asked questions #

How can I identify a European hornet? #

European hornets are larger than most wasps, typically about 1 to 1.5 inches long, with a distinctive yellow and brown striped abdomen. They have a more robust body and a smooth, rounded head compared to other stinging insects. If you see a large wasp-like insect with those color patterns, it’s likely a European hornet.

What kind of behavior can I expect from European hornets? #

European hornets are generally less aggressive than yellowjackets; they usually only sting if they feel threatened. They tend to build their nests in trees, shrubs, or even wall cavities, and they are more active during the day. You might see them foraging for food, especially in late summer when their nests are at their largest.

Are European hornets a risk to my family or pets? #

While European hornets can sting, they are not typically aggressive unless their nest is disturbed. However, their stings can be painful and may cause allergic reactions in sensitive individuals. It’s best to avoid their nests and contact a professional if you find one near your home.

When is the best time to deal with European hornets in San Antonio? #

European hornets are most active from late spring through early fall, peaking in late summer. If you notice a nest, it's advisable to address it in the early morning or late evening when the hornets are less active. This timing helps reduce the risk of stings during treatment.

What does your treatment process for European hornets involve? #

Our treatment for European hornets typically starts with a thorough inspection to locate the nest. We use targeted treatments that effectively eliminate the hornets while minimizing risks to your family and pets. After treatment, we can also offer advice on preventing future infestations, ensuring your home remains hornet-free.

Last reviewed April 25, 2026 by Travis Lambert (Owner).