That Giant Hornet At The Window Is Not A Murder Hornet

Almost certainly a European hornet. It is the only true hornet in Ohio, it is the largest wasp in the state, and Ohio State University Extension says the size is exactly what gets it misidentified. The northern giant hornet, the one the headlines called a murder hornet, has never been confirmed in Ohio, and state and federal agriculture agencies declared it eradicated from the United States in December 2024.

Two versions of this call come in. Something very large hits a lit window after dark and nobody gets a good look at it. Or there is a hole in a soffit or a barn board with steady traffic going in and out, and the insects using it are far bigger than the wasps anyone is used to. Our stinging insect control work deals mostly with the second one. Both start by settling what the insect is, because that changes everything that comes after.

Are Murder Hornets In Ohio?

No, and not anywhere else in the country either. Ohio State University Extension's BYGL alerts were clear through the whole scare that the northern giant hornet had never been confirmed in Ohio. In December 2024 the Washington State Department of Agriculture and the USDA announced that the species had been eradicated from Washington State and from the United States, and BYGL carried the announcement. The standard for saying that out loud is three straight survey years with no confirmed detection, and 2024 was the third.

The entire American record is short enough to list. The Washington State Department of Agriculture confirmed the first one, a dead hornet collected by a resident in Blaine, Washington, in December 2019. A single nest was found and destroyed in October 2020. Three more were located in north Whatcom County in August and September 2021. Nothing has turned up since. The agency credits the public with the result: every nest detection came directly or indirectly from a public report, and half of the confirmed detections came from a member of the public.

So What Is The Big One In Your Yard?

The European hornet, Vespa crabro, which is not native here. Ohio State University Extension places the first United States record in New York State around 1840. Ohio State calls it the largest wasp in Ohio and, in the same fact sheet, a beneficial predator rather than a threat, which is not what most people expect to read about an insect this size.

Published lengths vary a little. Ohio State gives about one inch to one and a quarter. Cornell's integrated pest management program puts the species at one to one and a half inches, or 26 to 38 millimeters. The color pattern settles an identification faster than a ruler does: BYGL's field test for separating it from the northern giant hornet is a yellow face with a reddish brown head and thorax, and black markings on the abdomen that come to teardrop shapes.

Telling bees from wasps in general, and reading a nest to work out what built it, is a bigger job than one post. We went through that in bee, wasp or hornet.

Why It Keeps Hitting The Window After Dark

This is the part that unsettles people, and it happens to be the most useful identification clue in the state. Cornell's integrated pest management program notes that European hornet workers will occasionally bang on windows at night, drawn to the light. Nothing else that size is flying around an Ohio house at ten in the evening.

Penn State Extension turns the same behavior into the one piece of management a homeowner can do alone: turn porch lights off at night in the fall, which cuts the number of visits until cold ends the colony. One caution travels with it. A hornet at the kitchen glass tells you where your light is, not where the nest is, and that is no reason to go pulling at a woodpile in the dark.

Where The Nest Is, And What That Changes

A European hornet nest is paper built inside a cavity, not the grey football hanging off a branch. Penn State Extension describes nests in protected aerial spots, typically a hollow in a large standing tree and sometimes in the wall voids of houses. Ohio State's fact sheet, citing Penn State, names attics, garages, barns, wall voids and window shutters as the preferred sites.

The scale inside is worth knowing before anyone decides to handle it alone. Penn State says nest size peaks in mid September, when most nests hold 200 to 400 workers, and that large nests can reach 1,000. Where that nest sits is what decides whether it is a job at all.

• A hollow tree at the back of the lot. Nothing and nobody walks past it. Ohio State is plain that the species is a predator doing useful work, and this one is usually best left to get on with it.
• A wall void, soffit, attic or shutter box. The colony is inside a building people use and the entrance is a gap in that building. This is the version that needs somebody.
• Anything within a few feet of a door, a deck or a walk used every day. Proximity decides more here than the species does.
• A house where someone has a known sting allergy. That changes the answer wherever the nest happens to be.

Around North Canton, Hartville and Massillon there is no shortage of the second kind: barns, detached garages, older soffits and shutter boxes on houses that have been added onto twice. What a wasp and hornet removal visit involves, including why nobody seals the entrance hole first, is laid out in what happens on the visit.

The One You Are Seeing Now Is Probably Next Year's Queen

Late autumn sightings have a specific explanation. BYGL describes the annual cycle: males are produced late in the season, they mate with the new queens, and the new queens then leave the nest to overwinter away from it, under bark, in mulch, in leaf litter and in other protected spaces. Only those queens get through the winter. The rest of the colony dies.

Penn State adds the detail that matters to a building. Fertilized queens overwinter in protected places that include the wall voids of buildings, and those are the ones that turn up indoors, in attics and in living areas, when they wake in spring. Ohio has the spring half on record. BYGL's Medina County office reported a run of calls one May about large wasps found inside homes, all of them European hornets, and traced them to new queens that had come in through a gap along a window, a door or an external vent.

So the gap a queen finds in October is the gap that puts a hornet in the hallway in April. Closing the openings around window frames, door frames and vents is worth doing on its own account, and it sits on the same list as the work that keeps the rest of the winter pests out of the house.

Is The Nest Empty Once It Freezes?

Usually, with one Ohio exception worth carrying around. BYGL is clear that old nests are not re-used, because next season's queen starts somewhere new. It also notes that occasionally an entire European hornet nest survives the winter where it is protected enough, and that nests in Ohio have been observed getting through three winters.

That is rare, and the reason to know it is what it does to an assumption. A nest in a tree after a hard freeze is finished. A nest inside a wall void or an attic, with a heated structure around it, is not automatically finished, and the calendar is a poor reason to open the cavity up and find out.

State Termite has worked on Northeast Ohio buildings since 1933, and a hornet nest in a barn wall in Hartville is the same piece of work as one in a soffit in North Canton. If there is traffic going in and out of a hole on your place, or something large keeps hitting the kitchen window after dark, send it through our request form for a free estimate or call 330-494-6199.