South Carolina is home to several hornet and wasp species that residents encounter regularly, plus one new invasive arrival that has state officials on alert. The European hornet is the only true hornet established across the state, but bald-faced hornets, cicada killer wasps, and yellowjackets are common lookalikes that generate plenty of concern. Knowing which species you’re actually dealing with determines whether you need to worry.
Species You’ll Actually Encounter
The European hornet is the big one most South Carolinians notice first. Workers measure about 1 to 1.3 inches long, with brown bodies marked by wide yellow stripes. They look like oversized yellowjackets, but their coloring leans brown-and-yellow rather than the sharp black-and-yellow pattern of a yellowjacket. Queens, which appear in spring, are even larger and more reddish-brown. The head on both workers and queens shifts from reddish-brown at the back to yellowish near the face.
Bald-faced hornets are technically not true hornets (they’re more closely related to yellowjackets), but they’re widespread in South Carolina and commonly called hornets. At 0.4 to 0.7 inches, they’re noticeably smaller than European hornets and easy to identify by their black-and-white patterning. They build the large, football-shaped paper nests you see hanging from tree branches and eaves.
Two other species regularly get mistaken for hornets. Eastern cicada killer wasps are the largest of the group at 1.5 to 2.2 inches, and their size alone can be alarming. Despite their intimidating appearance, they’re solitary ground-nesting wasps that rarely sting people. Southern yellowjackets are on the small end at 0.4 to 0.7 inches but make up for it with aggressive behavior, especially near food sources in late summer.
European Hornets: Nesting and Behavior
European hornets prefer sheltered nesting spots. You’ll find their nests inside hollow trees, barns, sheds, attics, and wall voids. Unlike bald-faced hornets, they almost never build nests in open, exposed locations. The nest itself is often constructed right at the opening of a cavity rather than deep inside, and it’s covered in a coarse, tan, paper-like material made from decayed wood fibers. Nests built inside wall voids can produce a noticeable odor.
One behavior that catches people off guard: European hornets fly at night. Most stinging insects don’t. They’re attracted to bright exterior lights and lit windows, and they’ll slam into glass with surprising force. If you’ve ever heard something large and buzzy banging against a window on a summer night, there’s a good chance it was a European hornet.
A colony starts each spring when a single queen emerges from hibernation and begins building a nest alone. Once she produces enough workers, she stays inside and focuses entirely on laying eggs while the workers (all female) handle foraging, nest expansion, and defense. By fall, a colony can hold 300 to 500 workers, occasionally up to 1,000. Late in the season, the colony produces males and new queens. These mate, and the fertilized females seek sheltered spots to hibernate through winter, often under loose bark, in rotting stumps, or in attics. The rest of the colony dies. Old nests are never reused. Every spring, each surviving queen starts from scratch.
The Yellow-Legged Hornet: A New Threat
The yellow-legged hornet is an invasive species that has been detected in Georgia, South Carolina, and North Carolina. It builds large paper nests above ground, typically high in trees or on structures like barns, garages, and sheds. The species is a serious concern because it preys heavily on honeybees, posing a direct threat to pollinators and the agricultural systems that depend on them.
Clemson University’s Department of Plant Industry has launched a dedicated reporting system where South Carolina residents can learn to identify yellow-legged hornets and submit sightings. If you spot one, you need to include a photo of the suspected hornet or nest with your report. Critically, do not disturb the nest. Leave it intact so field inspectors can properly identify and remove it.
Several native insects closely resemble the yellow-legged hornet, including bald-faced hornets, European hornets, paper wasps, yellowjackets, cicada killers, and even hoverflies. Misidentification is extremely common, so checking your find against reference images before reporting saves time for everyone involved.
What About “Murder Hornets”?
The northern giant hornet (formerly called the Asian giant hornet, and widely nicknamed “murder hornet” during the 2020 media cycle) has not been found in South Carolina. Clemson University Extension entomologist Eric Benson put it bluntly: the chances that northern giant hornets are in South Carolina are “about zero,” and the chances they’ll arrive and establish themselves anytime soon are “also close to zero.” The species that generated panicked social media posts from South Carolinians were almost certainly European hornets or cicada killers, both of which are large enough to alarm anyone unfamiliar with them.
How to Tell Them Apart
Size is the quickest sorting tool. Cicada killers are the giants at 1.5 to 2.2 inches, with yellow-and-black banding on the abdomen and a rusty-brown thorax. They dig burrows in sandy or bare soil and are solitary, so you’ll never find a colony. European hornets fall in the middle at 1 to 1.3 inches, with brown-and-yellow coloring and a preference for nesting inside cavities. Bald-faced hornets and yellowjackets are both under an inch. Bald-faced hornets are black and white, while yellowjackets are the classic black and yellow with a compact, shiny body.
Behavior helps too. If it’s flying at night near your porch light, it’s almost certainly a European hornet. If it’s hovering near the ground in a sandy patch of your yard, that’s a cicada killer. If it’s swarming your outdoor meal in September, you’re dealing with yellowjackets.
Stings: What to Expect
Hornets, yellowjackets, and wasps can all sting repeatedly, unlike honeybees that lose their stinger after one use. A normal sting causes pain, swelling, and redness limited to the area around the sting site. This resolves on its own within a few hours to a day.
Large local reactions are more dramatic. A sting on your forearm might cause your entire arm to swell. This looks alarming but is generally treated the same way as a normal reaction: ice, over-the-counter pain relief, and patience. These larger reactions can persist for two to three days. If the swelling is unusually severe or painful, antihistamines or corticosteroids can help reduce discomfort.
Anaphylaxis is the serious concern. It’s less common, but it can impair breathing and send the body into shock. Symptoms progress rapidly, and the immediate response is an epinephrine injection. Anyone who has had a severe allergic reaction to a sting in the past should carry an epinephrine auto-injector during the months when hornets and wasps are active, roughly April through November in South Carolina.
Dealing With Nests on Your Property
A European hornet nest inside a wall void or attic is worth addressing, both because of the sting risk from a colony of several hundred workers and because of the smell these nests can produce. Bald-faced hornet nests hanging from a tree far from foot traffic are generally fine to leave alone since the colony will die off naturally with the first hard frost. Nests near doors, play areas, or high-traffic zones are a different calculation.
If you suspect you’ve found a yellow-legged hornet nest, don’t attempt removal yourself. Report it through Clemson’s yellow-legged hornet system with a photo and location, and let inspectors handle it. For established colonies of European hornets or other species in problem locations, a licensed pest control professional is the safest route. Evening treatments are most effective because the full colony is inside the nest, and European hornets’ nighttime flying habit means they’ll be active and defensive even after dark.