Wasp Nest Identification Guide: 5 Types in the Treasure Valley and How to Tell Them Apart (2026 Update)

Wasp nest identification is the whole game. The wrong call can put your family in the ER. Yellow jackets and bald-faced hornets attack in swarms. Paper wasps are mild-mannered until you swing a broom at one. Mud daubers will not sting you at all. Figure out what you are looking at before you do anything else.

Right now, in July 2026, wasp season is peaking across the Treasure Valley. Yellow jacket colonies that started as a single queen in April are pushing 800 to 1,500 workers, and they still have six weeks of growth ahead of them. Our phones ring hardest in the last two weeks of July every year for exactly this reason.

Over the past ten-plus years we have pulled hundreds of nests off homes across Boise, Meridian, Eagle, Nampa, Kuna, Caldwell, and Star. This guide covers the five nest types you will actually see here: paper wasps, yellow jackets, bald-faced hornets, mud daubers, and the increasingly common European hornet. For each one you will get the shape, the color, the location, the danger level, and the phone number to call when it is beyond a broom-handle solution.

Look at three things from 20 feet away: shape, location, and color. An open umbrella of gray cells under an eave is a paper wasp. A big gray football hanging in a tree is a bald-faced hornet. A steady stream of wasps going in and out of a hole in the lawn, siding, or wall is a yellow jacket. A cluster of hardened mud tubes on a garage wall is a mud dauber. A larger brownish paper nest inside a hollow tree or attic (rare in Idaho) is a European hornet.

That is the 30-second version. The table below and the sections that follow go deeper.

Use this side-by-side to match what you are seeing to the species. The danger level is based on what we actually see on service calls across Boise and the Valley, not a generic scale.

If your nest matches any of the "high" rows, do not climb the ladder with a hardware store can. Call (208) 297-7947.

Paper wasps hunt aphids, caterpillars, and other soft-bodied garden pests. If a small nest is in a back corner nobody touches, leaving it alone is a fair call. If it is over a door, on the play set, or the kids walk under it, treat it or call.

Paper wasp nests are the open umbrella-shaped combs you see hanging under south-facing eaves, deck rails, doorframes, and playset canopies. This is the most common nest we handle in Meridian and Nampa where newer construction has long, unbroken soffit runs the sun hits all afternoon. You can see individual cells from below.

DANGER LEVEL: HIGH. Never pour gas, boiling water, or spray foam into a yellow jacket entry hole. The colony will pour out and swarm you in seconds. This is where most stinging emergencies come from in Boise every August. Our yellow jacket nest in wall or ground guide covers exactly why DIY backfires here and what we do instead. Call (208) 297-7947 for same-day removal.

Yellow jacket nests are the #1 dangerous nest in the Treasure Valley in July. The nest itself is usually hidden. You almost never see the paper. What you see is a steady stream of shiny, smooth, black-and-yellow wasps disappearing into a hole in the lawn, an old rodent burrow, a gap under siding, a soffit crack, or a wall void.

The North End alleys of Boise and the older Eagle foothills yards are our biggest hotspot every summer. Yellow jackets love the moisture around irrigation boxes, the cavities in old wood fencing, and the abandoned vole tunnels that dry out under mid-summer lawns.

DANGER LEVEL: HIGH. Never attempt DIY removal of a bald-faced hornet nest. The football-sized nests we pull every summer sit 8 to 15 feet up, well beyond the reach of any hardware store can, and one disturbed colony can deliver 30-plus stings in under a minute. Call (208) 297-7947.

Bald-faced hornet nests are the football-shaped gray paper balls you spot hanging from tree branches, tall shrubs, and the occasional gable. Despite the "hornet" name, they are technically a type of yellow jacket. And they are just as aggressive. The nest is unmistakable once you see one.

Our biggest cluster of these nests every summer runs along the Boise River corridor. The mature cottonwoods from Barber Park to Eagle Island are prime real estate. Hidden Springs, Avimor, and the Boise Heights homes with tall trees also see them regularly. We also pull a handful each year off the eaves of Nampa and Caldwell farmhouses.

If you want fewer black widows and hobo spiders in your garage, leave the mud tubes alone. Mud daubers are one of the best natural spider controls in Idaho. If you want them gone anyway, knock the tubes down after dark with a putty knife. No spray needed. See our full mud daubers in Idaho guide for the full picture.

Mud dauber nests are the hardened clay tubes you find lined up in garage corners, on shed walls, and under eaves. They look intimidating, but mud daubers are solitary wasps with no colony to defend. They almost never sting. We treat these as low-priority every time.

They show up in every Treasure Valley city. Boise, Meridian, Eagle, Nampa, Kuna, Caldwell, Star. If you have a detached garage or a shed with any dust and shade, there is a good chance you have one on the wall right now.

DANGER LEVEL: HIGH. European hornets are larger and their nests are almost always inside a cavity, which makes DIY treatment ineffective and dangerous. If you see one, call (208) 297-7947.

European hornet nests are still rare in Idaho, but we started seeing more of them in 2024 and 2025. If you find a larger brownish paper nest inside a hollow tree, an attic void, or the eave of an old barn, this is the species to consider. Do not confuse it with the murder hornet stories from the coast. European hornets have been in North America for over a century.

By mid-July, paper wasp nests are close to full size (20 to 75 wasps), yellow jacket colonies hit 800 to 1,500 workers, bald-faced hornet nests hold 200 to 500 hornets, and European hornet colonies are at 100 to 300. Mud daubers are solitary, so "colony size" does not apply. The one number to remember: yellow jackets and bald-faced hornets are still growing. What you see in mid-July doubles or triples by late August.

This is why July is the treat-it-now window. A yellow jacket ground nest we knock down at 800 workers today is a much smaller problem than the 4,000-worker version of the same nest in six weeks.

Hornets are technically a subset of wasps. In the Treasure Valley, "hornet nest" almost always means a bald-faced hornet (an enclosed football-shaped gray paper nest in a tree) or the rare European hornet (a brownish nest in a cavity). "Wasp nest" is the catch-all people use for paper wasp umbrellas, yellow jacket holes, and mud dauber tubes.

The practical difference is behavior. Bald-faced hornets and yellow jackets attack in coordinated swarms and can sting many times each. Paper wasps sting when crowded. Mud daubers essentially never sting. The nest shape tells you which one you are dealing with, which tells you how dangerous it is.

If any of those bullets match, stop reading and call (208) 297-7947. Same-day service is available if you book by noon.

Here is the triage we walk homeowners through on the phone every summer.

Always call us for:

Even a small nest can send you to the ER if you are allergic. The CDC reports about 60 fatal wasp, hornet, and bee stings per year in the United States. If you have any doubt, call (208) 297-7947.

If you decide to remove a small paper wasp nest yourself, follow this order. Skipping any step is how people get stung.

Wasp and hornet removal is included in our quarterly ($119) and bimonthly ($99) plans for homes up to 2,500 sq ft. If activity comes back between visits, we come back free.

Our wasp and hornet removal service is built for the five nest types above and runs the same way whether you are in Boise, Meridian, Eagle, Nampa, Kuna, Caldwell, or Star.

If the nest is bigger than a golf ball, inside a wall, underground, hanging from a tree, or anywhere near a door, deck, or play area, do not climb a ladder with a hardware-store can. Call (208) 297-7947 and we will identify the species, remove the nest, and treat the surrounding area so the next queen looks elsewhere.

New customers start at just $49 for the initial visit on any quarterly or bimonthly plan. Same-day service is available if you book by noon, weekdays. We have served 2,500-plus Treasure Valley families and hold a 4.9-star Google rating across 170-plus reviews.

Want more? See our Boise wasp nest removal guide, our yellow jacket nest in wall or ground deep-dive, and how to prevent wasp nests from coming back.