Why the winter rule breaks down on the Gulf Coast
The standard advice about wasps is that you can wait them out. In much of the country a colony builds all summer, produces new queens, and dies with the first hard freezes, leaving an empty nest that is never reused. New Orleans is not reliably part of that country. Winter lows here average about 45 degrees, and Clemson and Texas A&M both record southern yellowjacket colonies in Gulf South states that survive the cold season and continue expanding into a second or third year. Texas A&M has reported perennial nests measuring six feet across. What that means practically is simple. A first year colony is a job. A second year colony is a different job, with more workers, a larger cavity, and a much lower tolerance for someone poking at the entrance. So the useful question is not just what species you have, but how long it has been there. If the same opening was busy last fall and is busy again in early spring, before this year's queens would have had time to build anything, you are looking at a colony that never stopped, and that is a professional assessment rather than a wait and see.
The three stinging insects you are most likely to meet
Native paper wasps are the everyday ones. Their nest is an open comb on a short stalk, cells facing down, with a few dozen wasps sitting on the surface. They go under gallery ceilings, shutters, shed roofs, mailbox posts, and grill lids. They will defend the comb if you get close, but they do not patrol. The bald-faced hornet is the one that alarms people, and reasonably. Penn State puts its range across most of the contiguous states and the District of Columbia. Its nest is a closed gray paper shell with a single entrance, and the colony defends a zone around the whole nest rather than just the comb face. The European hornet is the odd one out. Penn State describes it as established across the eastern United States. It is big, over an inch, and it flies at night, so people meet it at a porch light or a lit window long before they find the nest. It usually nests in a hollow tree, an attic, or a wall void. Identifying which of the three you have determines everything else, including whether anyone should be on a ladder.
Where nests hide in a wet, low-lying city
Water shapes where wasps nest here more than temperature does. With roughly 64 inches of rain a year and humidity averaging 77 percent, the scarce thing on a New Orleans property is a dry, sheltered cavity, and that is exactly what a queen is hunting for in spring. Up high, the reliable spots are soffit gaps where boards have pulled apart, the space behind fascia, unscreened attic vents, and the ceilings of galleries and carports. Down low, on a lot sitting around six feet below sea level, the candidates are crawl space vents, the underside of a raised floor, old rodent holes at the base of a wall, and the inside of hollow fence posts and gate frames. Outbuildings deserve their own pass. Sheds, detached garages, and covered equipment get opened a few times a year, which is enough time for a colony to establish unnoticed. Finding the active entrance is a watching job rather than a searching job. Stand back in the morning sun, pick a suspicious opening, and count traffic for two minutes. Real entrances announce themselves.
Renters, landlords, and shared walls
In a city with as many doubles, converted houses, and shared courtyards as this one, the question of who deals with the nest comes up fast. The workable dividing line is the building envelope. A colony inside the structure, in a wall, soffit, attic, or under a raised floor, got there through a defect in the building. That normally sits with the owner, and so does the sealing work afterward, because an unsealed cavity is a repeat problem rather than a single incident. A small comb on a balcony rail or a grill you own leans toward tenant upkeep. Shared space complicates it. A nest in a party wall or over a common courtyard entrance affects more than one unit, and one tenant treating it privately can drive wasps toward a neighbor. Document in writing rather than by phone. A photograph of the entrance, the date first noticed, and a note about how close it is to a doorway makes the request concrete. If anyone in the building has a venom allergy, put that in the first message, because it changes how urgently the work should be scheduled.
How to compare two quotes for the same nest
Two prices for the same wasp job can differ by a lot, and the gap is usually about scope rather than skill. Start with what is being treated. One quote may cover the nest you pointed at, while the other covers the nest plus a walk of the whole property. On an older lot with a shed and a raised floor, that second look often turns up something. Then check timing. Work done at dusk or after dark catches the full colony at home, which is what makes a single application effective. A midday visit treats the wasps that happen to be present. Then removal. Killing a bald-faced hornet colony and taking the nest down are two separate pieces of work, and only one of them may be in the number you were quoted. Then the return policy. Ask what happens if traffic is still heavy after a week, and whether a second application costs extra. Finally, licensing. Both the EPA and the National Pesticide Information Center publish directories of state pesticide agencies, so verifying a credential takes a few minutes and settles the question.