Wasp Nests: Identification, Locations, and What to Do

Finding a wasp nest on your property can be alarming, but the nest itself tells you a great deal about which species you are dealing with, how large the colony is, and how much risk it poses. This guide helps you identify wasp nests by type and location, and decide what to do about them.

Types of Wasp Nests

Open Paper Comb Nests

These are the nests built by paper wasps. They consist of a single layer of open hexagonal cells attached to a surface by a thin stalk. The comb hangs downward with the cells facing the ground, resembling an upside-down umbrella.

• Size: Typically 2 to 6 inches in diameter at maturity
• Population: 15 to 200 wasps
• Material: Gray or brown papery material made from chewed wood fiber
• Visibility: The comb is fully exposed — you can see the developing larvae inside

Enclosed Paper Nests

Yellow jackets and bald-faced hornets build enclosed nests with a papery outer shell covering internal layers of comb. These nests have a single entrance hole.

• Size: Golf ball-sized in early summer, up to basketball or larger by fall
• Population: 200 to 5,000+ wasps
• Material: Layered paper shell with multiple comb tiers inside
• Location: Trees, shrubs, eaves, attics, walls, and underground

Mud Nests

Mud daubers construct nests from mud rather than paper. These come in two main forms:

• Tube nests: Rounded mud tubes the size of a thumb, often in clusters
• Organ pipe nests: Parallel mud tubes resembling organ pipes

Mud nests are solid and hard when dry. Each sealed cell contains paralyzed spiders and a developing wasp larva.

Underground Nests

Many yellow jacket species nest underground, typically in abandoned rodent burrows. The nest itself is an enclosed paper structure, but it is hidden below ground with only a small entrance hole visible at the surface. See underground wasp nests for detailed guidance.

Common Nest Locations

Wasps choose nest sites based on shelter, temperature regulation, and proximity to food and water. The most common locations around homes include:

• Eaves and soffits: Protected horizontal surfaces are prime spots for paper wasps
• Attics: Accessible through gaps in vents, soffits, and rooflines
• Wall cavities: Entered through gaps in siding, weep holes, or construction gaps
• Underground: In abandoned burrows, under landscape timbers, or in mulch beds
• Trees and shrubs: Bald-faced hornets and some yellow jacket species
• Outbuildings: Sheds, garages, barns, and playhouses
• Playground equipment: Hollow tubes and covered areas

Identifying a Nest by Wasp Behavior

If you cannot see the nest, wasp behavior can lead you to it:

• Flight paths: Watch where wasps consistently fly. In the morning, they leave the nest to forage. In the evening, they return. Follow their flight lines.
• Traffic patterns: A steady stream of wasps entering and leaving a specific spot indicates a nest entrance.
• Landing pattern: Wasps approaching a nest slow down and hover before landing at the entrance.

Should You Remove the Nest?

Not every wasp nest warrants removal. Consider these factors:

Leave It If

• The nest is in a remote area away from foot traffic and activity zones
• The species is docile (mud daubers, cicada killers)
• The colony is providing pest control benefits in your garden
• No one in your household has a sting allergy
• The nest is high in a tree and will die off naturally in winter

Remove It If

• The nest is near a doorway, walkway, deck, patio, or play area
• The species is aggressive (yellow jackets, bald-faced hornets)
• Someone in your household is allergic to wasp stings
• The nest is inside your home (attic, wall, or garage)
• You are finding wasps inside your house

Removal Options

For detailed removal instructions, see how to remove a wasp nest. Your main options are:

• DIY with wasp spray: Appropriate for small, accessible paper wasp nests
• Professional removal: Recommended for large nests, aggressive species, hard-to-reach locations, and anyone with sting allergies
• Wait for winter: In cold climates, colonies die off in late fall. You can safely remove the empty nest after the first hard freeze.

Do Wasps Reuse Old Nests?

Social wasps (paper wasps, yellow jackets, hornets) do not reuse old nests. Each spring, new queens build entirely new nests from scratch. However, wasps may build new nests in the same general location if the site features — shelter, temperature, and access — remain attractive. Removing old nests and treating the area with repellents can discourage this.

Expert Insight

In 15 years of examining wasp nests as a Board Certified Entomologist, I have developed an appreciation for the engineering sophistication of these structures. A paper wasp nest is made from wood fibers chewed into a pulp and mixed with saliva — essentially handmade paper. Yellow jacket nests have multiple layers of paper envelope providing insulation that helps the colony regulate temperature. I have measured temperature differences of 10 to 15 degrees between the outside and inside of a large yellow jacket nest.

The most useful skill I teach homeowners is nest identification from a safe distance. If you can see open hexagonal cells with a single attachment stalk and no paper covering, it is a paper wasp nest. If you see wasps entering and exiting a single hole in a fully enclosed gray paper structure, it is likely yellow jackets or hornets. If you see mud tubes on a wall, it is a mud dauber. This identification determines everything — the species, the risk level, and the appropriate response.

References and Further Reading

• University of Kentucky Entomology - Wasp Nest Identification — Academic resource on nest architecture, materials, and species-specific nest characteristics.
• Penn State Extension - Identifying Wasp Nests — Extension guides for identifying different types of wasp nests and their associated species.
• NPMA - Wasp Nest Guide — Consumer-friendly guide to recognizing wasp nests and determining appropriate responses.
• EPA - Safe Nest Management — EPA guidance on safely managing wasp nests using approved pest control methods.
• CDC - Nest-Related Sting Risks — CDC data on sting incidents related to wasp nest disturbances.

Main Causes

Wasps build nests on structures because eaves, soffits, attic vents, deck rafters, wall voids, shed interiors, and dense shrubbery provide protected anchor points and easy access to forage. Queens emerging in spring seek out these locations, and a single founding queen establishes a colony that grows from a few cells in April to hundreds or thousands of workers by late summer. Indoor encounters happen when nests in wall voids or attics route through entry points, when foragers come inside through open doors and damaged screens chasing food and water, and during fall when colonies are at peak size and most defensive. Outdoor food and sweet drinks, ripening fruit, garbage, and uncovered pet food all amplify foraging pressure around occupied spaces.

How to Identify

Identify the species and locate the nest before any control action. Paper wasps build open, downward-facing umbrella-shaped combs under eaves, deck railings, playground equipment, and grill covers. Yellow jackets build enclosed papery nests in wall voids, attics, ground holes, and dense shrubs. Bald-faced hornets build large basketball-sized gray paper nests hanging from tree branches and structure corners. Mud daubers build small mud tubes on walls and ceilings and are non-aggressive. Watch returning workers at dusk to pinpoint nest entry points, especially for ground and wall-void nests that are otherwise invisible. Species, nest size, and nest location together determine whether removal is straightforward, hazardous, or requires professional intervention.

Risk and Severity

Wasp stings are painful, common, and occasionally life-threatening. Most stings produce localized pain and swelling and resolve within hours, but multiple stings or stings in someone with venom allergy can trigger anaphylaxis — a medical emergency requiring epinephrine and emergency care. Yellow jackets and hornets are particularly aggressive when nests are disturbed and can deliver dozens of stings to a single person, especially with ground-nesting yellow jackets where mowing or yard work triggers mass defensive responses. Stings inside the mouth or throat from swallowed wasps can produce dangerous airway swelling regardless of allergy status. Risk scales with nest size, nest location relative to occupied space, household members with venom allergy, and time of year — late summer is peak risk.

Solutions and Actions

Treat wasp nests at dawn or dusk when most workers are inside and least active, wearing protective clothing covering all skin, eyes, and face. For paper wasp nests in accessible locations, use a wasp and hornet jet spray rated for the species from a safe distance, then remove the dead nest material the next day to discourage rebuilding. For yellow jacket nests in wall voids, ground holes, or attics — and for any large nest with visible heavy traffic — use a licensed professional, because these nests harbor hundreds to thousands of workers and disturbing them produces mass stinging responses. Never plug a wall-void nest entry without first eliminating the colony, because trapped workers will tunnel through interior wall surfaces seeking exit.

Prevention

Prevention focuses on denying nest sites and reducing forage attractants. Inspect eaves, soffits, attic vents, deck railings, sheds, and outbuildings in early spring and brush down any starting nests while they are still small enough for a single queen to be the only occupant. Seal cracks larger than a quarter inch in siding, soffit gaps, and around utility penetrations to block wall-void access. Cover outdoor garbage cans and recycling with tight-fitting lids, keep sweet drinks and food covered during outdoor meals, and clean fruit drops from yards promptly. Maintain window and door screens and add door sweeps. Run a targeted residual treatment under eaves and along soffits in early summer where paper wasp nesting has been a recurring problem.

Frequently Asked Questions

How long does it take for a wasp to build a nest?

A lone queen can build a starter nest with 20 to 30 cells in one to two weeks. Once workers emerge and begin assisting with construction, the nest grows much faster. A yellow jacket colony can expand its nest from a queen's starter to a structure containing thousands of cells over a single season. Nest building is continuous from spring through early fall.

Do wasps reuse old nests?

Social wasps do not reuse nests from previous years. Each spring, new queens build entirely new nests from scratch. However, some species — particularly paper wasps — may build new nests in the same location as old ones if the site conditions remain favorable. Removing old nests and cleaning the attachment point helps discourage re-nesting in the same spot.

What is a wasp nest made of?

Most social wasp nests are made of chewed wood fiber mixed with wasp saliva, creating a paper-like material. Wasps scrape wood fibers from fences, decks, dead trees, and other wooden surfaces. Mud daubers build nests from mud collected from puddles and stream banks. The nest material and architecture vary by species and are useful for identification.

Is it safe to remove a wasp nest in winter?

Yes. By winter, the colony has died and the nest is empty. You can safely remove winter nests without any risk of stings. This is also a good time to inspect for and seal any entry points the colony used, preventing new queens from accessing the same nesting site the following spring.