Why waiting for winter is not a plan in Miami
In most of the country, the single most useful wasp fact is that frost ends everything. A high nest in October is a nest with a deadline, and that makes doing nothing a legitimate strategy. Miami does not offer that. With an average winter low of 60F, there is no freeze to kill workers or the founding queen. University of Florida describes the standard cycle, a colony founded in spring by a single queen with the remainder dying at winter's arrival, but UC entomologists are explicit that in very mild winters some yellowjacket colonies survive for several years and become quite large. What that changes is the decision rule. Elsewhere you weigh the nest against a few remaining weeks. Here you weigh it against an open-ended timeline, because a colony that keeps its workers through the cool months starts the next spring already staffed. The practical version: if you notice wasps using the same opening in December or January, that is not leftover activity from the fall. That is a colony that never stopped, and it is the situation most likely to become a large and expensive problem.
How large a Florida nest can actually get
The numbers are worth knowing because they explain why the advice about hidden nests is so cautious. University of Florida entomologists documented a Florida nest with over 2,800 wasps present. They also recorded an aerial nest standing about 2.5 meters, roughly 8 feet, containing 74 layers of comb. That is not a nest anybody removes with a can from a hardware store. Ground nests are less dramatic in appearance and no less substantial. One documented southern yellowjacket nest measured about 20 centimeters wide and 20 centimeters deep, positioned some 22 centimeters below the soil surface. From above, that is a small hole in the dirt near a hedge. The gap between what you can see and what is there is the whole safety issue. An open paper wasp comb shows you the entire colony. A hole in the ground shows you nothing, and in this climate the range of what might be behind it is very wide. When a nest reaches this scale, removal becomes planned work rather than a service call, often involving protective gear and more than one visit.
A calendar with no off season
Wasp activity here never fully stops, but it does have a shape, and the shape is worth planning around. Late winter and early spring: queens establish new colonies. This is the cheapest moment to deal with anything, because a new nest is a handful of cells and one wasp. It is also when to check any opening that has hosted a colony before. Spring into midsummer: workers take over foraging while the queen lays. Colonies expand steadily, and with 61 inches of rain a year keeping prey insects available, nothing slows that growth down. August through November: the peak. Colonies hold their largest worker force, defense radius widens, and foraging shifts toward sugar and protein from human sources. Patios and pool decks become the flashpoint. December and January: activity drops but does not necessarily end. A colony sheltered in a wall or a heavy shrub can continue, which is exactly the situation that produces an oversized nest the following year. Winter traffic at one opening is a signal worth acting on rather than ignoring.
The nest under the hedge that nobody sees
The serious sting incidents almost never involve a nest anyone was looking at. A yellowjacket colony in the ground announces itself only through traffic. The entrance is small, often under a hedge, at the base of a shrub, in mulch, or in an old animal burrow, and everything else is beneath the surface. Dense landscaping makes it easier to miss, because there is no bare patch to draw your eye. Disturbance is what triggers the response, and it travels through soil and roots. A mower, a hedge trimmer worked at the base of a plant, an edger, a shovel opening a hole, even repeated footsteps. Yellowjackets react collectively, pursue, and leave a chemical mark that brings more of the colony to the same target. The pattern shows up in national numbers. Of the 788 United States deaths from hornet, wasp, and bee stings the CDC counted between 2011 and 2021, 84 percent were male, reflecting who is running equipment and working outdoors. Standing still and watching a patch of ground for one minute before you start is the whole precaution.
wasps in walls, soffits, and roof edges
The second common Miami nest site is the building, and local construction offers plenty of entries. Concrete block with stucco develops hairline cracks at corners and around openings. Tile roof edges leave gaps. Soffit vents and screen enclosures tear. Any of those leads into a dry, stable cavity, and once a colony is inside, the space it can fill is limited by the framing rather than by weather. The visible sign is usually a few wasps at one point on a wall or a roof edge. The nest itself may be well away from that entrance inside the cavity, which is why treating the wrong gap accomplishes nothing. The rule that matters most: never seal the opening while the colony is alive. wasps blocked from their exit chew toward air and light, and in a wall that direction can be into a room. Treat, wait several days, confirm all traffic has stopped, then close it. After the colony is dead, closing the entry is what stops the site being used again, and in a climate without an off season that follow-through matters more than usual.
Getting a quote you can compare
Two companies can price the same nest very differently, and the reason is nearly always what is included. Ask each of them the same question: does this number cover killing the colony only, removing the nest material as well, or also closing the opening the wasps were using. Those are three jobs. A lower price that stops after the first is not deceptive, it is narrower, and the difference reappears when the same entry gets reoccupied. Ask about size. A technician who has watched the traffic should be able to tell you roughly what they think is in there and how they reached that estimate. Vague answers about a hidden colony are a reason to get a second opinion. Ask what happens if activity has not stopped after a week. Large or long-established nests sometimes need a second application. Ask when they treat. Willingness to schedule a hidden nest at dusk is the mark of someone doing the job properly, because the wasps out foraging in daylight survive a midday visit and come straight back.