Four wasps and four different nests
Identify by the structure, not the stripes, because nearly everything here is some version of yellow and brown. An open comb on a short stalk, cells facing down, under a porch ceiling or a deck stair, is a native paper wasp. The colony usually stays modest, defends the comb, and does not patrol far from it. A comb you cannot see, with wasps flying into a hollow railing, a downspout, or a grill body, is the European paper wasp. Same architecture, hidden location, and that difference is why people in Virginia find these nests by grabbing something rather than by looking up. A closed gray envelope with one hole near the bottom is a bald-faced hornet colony. Penn State reports the species across most of the contiguous states, and these wasps defend a radius around the nest, which is what makes hedge trimming risky in August. A hole in the ground or a crawl space vent with steady two-way traffic means yellowjackets, and that is the nest that produces multiple stings at once. If the insect is very large, brown, and flying after sunset, it is a European hornet, which nests inside voids and hollow trees.
Why the coast keeps wasps working longer
The wasp season does not end at the same time everywhere in Virginia, and knowing which end of the state you are on changes whether waiting is a sensible plan. The start is the same statewide. A queen who overwintered in shelter builds a small comb in April or May, workers emerge in June, and the colony compounds through a summer with highs near 87 degrees and about 44 inches of rain, which keeps insect prey abundant. The ending is where it splits. Inland and in the higher western counties, cold weather arrives earlier and more decisively, and a nest found in late fall may have little time left. Around Virginia Beach, Chesapeake, Norfolk, and Newport News, winter lows average closer to the freezing mark and arrive later, so colonies keep working past the point where an inland nest would be quiet. The practical version: in coastal Virginia, treat a nest near a door or a deck rather than betting on weather. In the inland counties, an out-of-the-way nest is a reasonable thing to leave, since the freeze will finish it and nothing will ever reuse the paper.
The nests hiding inside your deck
A large share of Virginia wasp complaints come from cavity nests, and they are the ones homeowners find with their hands. The European paper wasp builds an ordinary open comb, then puts it somewhere enclosed. Hollow deck and porch railings, open pipe stubs, downspout ends, storm window tracks, patio umbrella poles, and the inside of a covered grill are all fair game. Nothing is visible from a few feet away, so the first sign is usually wasps flying repeatedly into one small opening, and the second sign is a sting. That also makes them hard to treat casually. An aerosol emptied at the mouth of a railing frequently reaches the entrance and not the comb a foot inside, which leaves a colony that is alive and now defensive in a spot people touch every day. The two-step fix is what works: treat the cavity properly, then cap the opening after the colony is dead. The capping is the part homeowners skip and the part that matters most, because an uncapped rail end is simply advertising the same site to next spring's queen. An afternoon of caps and screens removes an entire class of problem from a Virginia deck.
Prevention around crawl spaces and older siding
The difficult nests, the ones inside the house, get in through a small number of predictable openings, and closing them is cheaper than treating what follows. Crawl space vents are first. Virginia's building stock includes a lot of crawl space construction, and a torn or missing vent screen is a direct route into a sheltered void that stays cool in August. Quarter-inch hardware cloth over each vent keeps wasps out while preserving airflow. Soffit seams, siding gaps, and gaps around utility penetrations come next. These are wall-void entrances for both yellowjackets and European hornets, and cool weather is the right time to caulk them, when nothing is flying and you can work at the wall without a crowd. Then there are the flat sheltered undersides where open combs start: porch ceilings, deck stair stringers, shed rafters, and the top lip of a storm door frame. A flashlight walk every couple of weeks from early spring, knocking down anything small, prevents most of what becomes a September problem. Last, handle the food side. Latched trash, rinsed recycling, picked-up fallen fruit, and lidded cups on the deck reduce how attractive your yard looks once scavenging begins.
Which nests count as an emergency
Exposure, not size, is the right test, and most nests do not qualify. It is urgent when someone on the property has reacted to a sting with more than local pain and swelling. The American College of Allergy, Asthma and Immunology reports about a 60 percent chance of a similar or worse reaction on a later sting, and puts potentially life-threatening venom reactions at 0.4 to 0.8 percent of children and roughly 3 percent of adults. Adults carry the higher risk, so a household without children is not automatically safe. It is urgent when the nest sits at an entry door, a deck stair, a mailbox, or a play set, because people pass those without looking. It is urgent when a ground nest is in a mowed section, since the next pass with equipment is the disturbance that triggers it. It is urgent when wasps start appearing indoors, which means the colony has a route through the wall or the crawl space. Everything else can be scheduled. A gray envelope high in a tree at the back of a Virginia lot, with nobody walking beneath it, threatens no one and can be left exactly where it is.