Bald-Faced Hornets
If you’ve spotted a large, football-shaped gray paper nest hanging from a tree branch or under an eave, that’s almost certainly a bald-faced hornet colony. These are the largest, most defensive wasps in coastal North Carolina, and a mature nest can hold 400 to 700 workers by late summer.
Despite the name, bald-faced hornets aren’t true hornets. They’re a type of aerial yellow jacket. What sets them apart is the size of the colony, the highly visible nest, and a willingness to attack anything that comes within about 10 feet.
How to Identify a Bald-Faced Hornet
- Size: about ¾ inch long, larger than a yellow jacket but smaller than a true European hornet.
- Body: Mostly black with bright ivory-white markings on the face, thorax, and last few abdominal segments.
- Face: The distinctive white "bald" face gives the species its name. Easy to spot up close, hard to confuse with anything else.
- Flight: strong, deliberate, often patrolling a perimeter around the nest.
Identifying the Nest
The nest is the easiest way to identify the species. It’s unlike any other wasp nest in the region:
- Football- or teardrop-shaped, gray, made of layered paper
- Fully enclosed (unlike a paper wasp's open umbrella nest)
- Hangs from a tree branch, shrub, or under an eave by a stalk
- Single small entry hole near the bottom
- Typical mature size: basketball to small watermelon (12 to 18 inches tall)
- Starts small in May; reaches full size by August
Signs of Bald-Faced Hornets
- Football-shaped gray nest visible in a tree, large shrub, or under a high eave
- Black-and-white wasps hovering or patrolling near the nest
- Increased wasp activity around outdoor food, garbage, or pet food bowls
- Hornets entering and exiting a single small hole on the underside of a hanging structure
- Hornets congregating on tree bark or wooden fencing, where they scrape wood fiber to build the nest
Are Bald-Faced Hornets Dangerous?
Yes, more so than paper wasps, and arguably more so than yellow jackets in some respects. Bald-faced hornets defend their nest with a wide perimeter and are notorious for two specific behaviors:
Long-Range Defense
Sentinels patrol a perimeter that extends 10 to 15 feet from the nest. They attack approaching humans, pets, or mowers well before someone might realize they’re getting close. This is why a tree-mounted nest is far more dangerous than its height would suggest. The ground beneath it is the attack zone.
Venom Spraying
Bald-faced hornets can spray venom from their stinger toward the eyes of intruders. The venom causes severe burning and temporary blindness, a serious additional hazard during DIY removal attempts.
Repeat Stings
Like other yellow jackets, each hornet can sting multiple times. A nest attack can produce dozens of stings in seconds.
Anyone with a known wasp allergy needs immediate emergency care after any bald-faced hornet sting. Even for non-allergic adults, 20+ stings warrant medical evaluation.
Treatment & Removal
Bald-faced hornet nests should be treated professionally. The combination of nest height, colony size, perimeter defense, and venom spray makes DIY removal among the highest-risk pest situations in coastal NC.
Step 1: Assess Location and Approach
Technicians evaluate the nest height, position, and surrounding obstacles. Treatment timing (almost always at dawn or dusk) and personal protective equipment requirements depend on these factors.
Step 2: Direct Nest Treatment
A targeted product is applied directly to the nest entrance from a safe distance. Within hours, all foragers returning to the nest are exposed, and the colony collapses.
Step 3: Nest Removal
Once activity has fully ceased (usually 24 to 48 hours after treatment), the nest is physically removed. Bald-faced hornets do not reuse old nests, but leaving the empty paper structure can attract a new queen to the same general location.
Never attempt to spray a tree-mounted nest from below. The sentinels will detect the spray and attack downward, and most household sprays don’t have the reach needed for a high nest.
Preventing Bald-Faced Hornets
- Walk the property weekly in May and June to spot new starter nests (golf-ball size with a single queen). Early treatment is fast and low-risk
- Keep outdoor garbage covered and pet food bowls clean to reduce scavenging activity that draws hornets close to the house
- Prune dense ornamental trees and shrubs near patios and decks to make new nests easier to spot early
- Maintain exterior caulk and paint; rough, weathered wood is where workers scrape pulp to build the nest
- Avoid wearing strong perfumes or florals outdoors during peak season (July through September)
Frequently Asked Questions
Technically, no, they’re a type of aerial yellow jacket in the genus Dolichovespula. The “hornet” name comes from their large size and aggressive nest defense, both of which are hornet-like. For practical purposes, treat them as hornets.
No. Each colony is annual. Workers die off after the first hard frost, and only newly mated queens survive winter. The empty nest can be removed safely once activity has ceased for at least a week after the first frost.
In May, when the nest is golf-ball-sized and only the queen is present, DIY removal is possible but still risky. Even a queen can sting repeatedly. Professional treatment is faster and safer at any stage.
Height itself isn’t usually the danger. The danger is the perimeter. If the nest is high enough that nobody walks under the canopy and no pets play in the area, it may be safe to leave it alone until it dies off in the fall. A technician can evaluate the actual risk for your situation.
Minor pollinators only. They primarily hunt other insects (including flies, caterpillars, and other wasps) and are most active around protein and sugar sources. They don’t have the same ecological importance as bees.
Plan Coverage
Bald-faced hornet nest treatment is included in Home + Yard, Home + Mosquito, and Ultimate Protection Plans. Removal of large or hard-to-access nests over 15 feet may require additional equipment and a small accessibility fee.