Bald-faced hornet nests and paper wasp nests look nothing alike once you know what to look for. The hornet nest is a large, enclosed, gray paper ball hanging from a tree or building. The paper wasp nest is a small, open umbrella of exposed cells tucked under an overhang. That single difference, enclosed versus open, is the fastest way to tell them apart and the most important factor in how you should handle what you’ve found.
What Each Nest Looks Like
A bald-faced hornet nest is a rounded, papery structure that looks like a gray football or basketball suspended from a branch or eave. The entire nest is wrapped in a thick, multilayered outer shell (called an envelope) made from chewed wood pulp mixed with saliva. You can’t see the inside. The only visible opening is a single entry hole near the bottom, where workers fly in and out. Inside that shell sit three or four tiers of horizontal comb stacked on top of each other, similar to floors in a building.
A paper wasp nest is the opposite: completely open and exposed. It’s a single layer of hexagonal cells arranged in an umbrella or inverted cone shape, attached to a surface by a thin stalk. There’s no outer wrapping at all, so you can see the cells, the larvae inside them, and the adult wasps standing right on the surface. The color ranges from light gray to brown. The whole structure rarely gets bigger than a fist or small plate.
Size and Colony Numbers
Mature bald-faced hornet nests reach impressive sizes. By late summer, a nest can be as large as a basketball or even bigger, housing 100 to 400 workers. The thick, multilayered shell adds substantial bulk, and the nest grows continuously from spring through fall as workers expand it.
Paper wasp nests stay much smaller. A typical colony produces 20 to 75 workers over the season, and the single open comb reflects that modest population. You’ll rarely find a paper wasp nest larger than a few inches across. If you’re looking at something big, gray, and enclosed, it’s almost certainly a hornet nest, not a paper wasp nest.
Where You’ll Find Them
Bald-faced hornets prefer height. Nests are at least three feet off the ground, but they’re often much higher, tucked into tree canopies where you might not notice them until leaves drop in autumn. A queen might also choose a large shrub, the eaves of a building, or another sheltered spot. Because these nests blend into branches and are sometimes 20 or 30 feet up, people frequently discover them only after walking too close.
Paper wasps nest in sheltered, low locations close to human activity. The undersides of porch roofs, deck railings, eaves, window frames, fence posts, and grill covers are all common spots. They pick places where the comb is shielded from rain but still accessible for flight. You’ll often spot them while doing yard work or opening a shed door. Paper wasps also nest in gaps between deck planks or inside open pipes, anywhere a small protected surface can anchor that central stalk.
Aggression and Sting Risk
This is where the difference matters most. Bald-faced hornets are extremely defensive of their nests. They’re classified in the same group as yellowjackets and share that aggressive temperament. People are most often stung when they accidentally stumble near a hidden nest or when the nest is close to a walkway or door. The colony responds quickly and in numbers. One unique behavior: bald-faced hornets can squirt venom from their stingers into the eyes of anyone approaching the nest, causing immediate tearing and temporary blindness.
Paper wasps will sting to defend their nest, but they’re considerably less aggressive. A disturbed colony might send 20 to 75 wasps after a threat, compared to several hundred from a hornet nest. Paper wasps also tend to give more warning, hovering or bumping before stinging. That said, their stings still hurt. The venom of both species contains compounds that cause sharp pain, swelling, redness, and burning at the sting site. For some people, swelling can spread well beyond the initial spot.
Seasonal Life Cycle
Both species follow the same annual pattern: a single overwintered queen starts a new nest in spring, raises workers through summer, produces new queens and males in fall, and then the colony dies off with the first hard frosts. Only newly mated queens survive the winter, hidden under bark or in sheltered crevices.
Neither species reuses an old nest. Bald-faced hornets never rebuild a previous nest. Each spring, every queen starts fresh in a new location. The same is true for paper wasps. So if you find an empty gray ball in a bare winter tree or a dried-out comb under your eave, the colony is gone for good. Those old nests gradually break down from weather and won’t attract new tenants.
Removal and Safety
Paper wasp nests are manageable for most homeowners. Because the nests are small, usually accessible, and home to relatively few wasps, you can treat them with a standard wasp spray sold at hardware stores. These sprays reach up to 20 feet. Paper wasp nests can even be treated during the daytime, as long as you don’t stand directly underneath the nest while spraying. Nighttime treatment is still the safest option since the wasps are less active.
Bald-faced hornet nests are a different situation entirely. The University of Kentucky’s entomology department puts it plainly: hornets are far more difficult and dangerous to control than paper wasps. The nests may contain hundreds of highly aggressive wasps, and the nests are often out of reach, requiring ladders or specialized equipment. Spraying a hornet nest during the day, or without the right protective gear, risks a mass attack. If you’ve identified a bald-faced hornet nest near your home and it poses a genuine safety concern, professional removal is the safer choice.
Quick Visual Comparison
- Shape: Hornet nests are enclosed balls with a single entry hole. Paper wasp nests are open combs with no covering.
- Size: Hornet nests grow to basketball size or larger. Paper wasp nests stay a few inches across.
- Location: Hornet nests hang high in trees, shrubs, or building overhangs. Paper wasp nests tuck under eaves, decks, and sheltered ledges close to ground level.
- Colony size: 100 to 400 hornets versus 20 to 75 paper wasps.
- Aggression: Hornets are highly aggressive and attack in large numbers. Paper wasps defend their nest but are slower to escalate.
- DIY removal: Paper wasp nests can usually be handled with store-bought spray. Hornet nests often require professional help.