Look at the nest before you look at the insect. Paper wasps build an open, umbrella-shaped comb hanging from a short stalk, with the individual cells clearly visible from below. Yellow jackets enclose their nest in a papery envelope, and more often than not you can't see it at all because it's inside a wall void, a soffit, or a hole in the ground. That single difference identifies them faster than anything about the insect itself.
Side by side
| Paper wasp | Yellow jacket | |
|---|---|---|
| Nest | Open comb, cells visible, hangs from a stalk | Enclosed paper envelope, usually hidden |
| Typical location | Eaves, deck railings, door frames, grills | Wall voids, soffits, ground burrows, shrubs |
| Body | Slender, longer waist, longer legs | Stockier, shorter, more compact |
| In flight | Legs dangle below the body | Legs tucked up, faster and more direct |
| Near the nest | Defensive but slower to react | Quick to defend, and defends in numbers |
| Late summer food | Mostly hunting insects | Scavenges meat and sweet drinks |
The behavioral tell most people notice first
If wasps are bothering you at a picnic, landing on soda cans, or hovering over a trash can, those are yellow jackets. Paper wasps hunt caterpillars and other insects to feed their young and have very little interest in your food.
That scavenging ramps up in late summer and early fall, when the colony's needs shift and natural food gets scarce. It's the same period when colonies reach peak size, which is why yellow jackets feel so much more aggressive in September than they did in June — there are more of them, competing harder.
Where you'll find each around a house
Paper wasps like open, sheltered, overhead spots: under eaves and porch ceilings, inside deck railings, in the frame of a grill lid, under playset platforms, inside unused patio furniture. The nest is visible if you look up, and it rarely gets very large.
Yellow jackets like enclosed voids. Gaps in siding, soffit and roofline openings, the space behind brick veneer, abandoned rodent burrows in the lawn, and the base of dense shrubs. You usually find them by noticing steady traffic at one small opening rather than by seeing a nest. If that's what you're seeing, yellow jackets in a wall covers what to do — and what not to do.
Why identification changes the job
A visible paper wasp comb under an eave is a straightforward, contained treatment. A concealed yellow jacket nest is not: the treatment has to reach the nest inside the void, the entry point shouldn't be sealed until the colony is dead, and the work is frequently at height with an actively defending colony. Same insect family, genuinely different job.
It also changes the urgency. A small paper wasp nest on a shed you rarely use can often be left alone. A yellow jacket colony in the wall of a bedroom is worth dealing with now.
Safety, plainly
Neither species loses its stinger, so both can sting more than once, and yellow jackets will recruit nestmates to defend. Don't swat at one near a nest opening, don't seal an active entrance, and don't treat a nest from a ladder. If anyone in the house has a known stinging-insect allergy, don't approach it at all.
Related
Wasp, hornet, and yellow jacket control explains how we treat each type, and wasp nest removal cost covers what drives the price. Not sure what you've got? Take a photo from a safe distance and send it with an inspection request.