Termite Swarms Are Already Showing Up in Southern California This Fall

The phone calls have a recognizable shape this time of year. Someone opens a blind in the late afternoon and there are two dozen winged insects working at the glass. Or they find a scatter of small translucent wings on a windowsill, in a sink, or caught in a cobweb near a sliding door — no insects at all, just the wings, which is somehow more unsettling. Swarm activity is picking up across Southern California right now, consistent with the wetter-than-average fall pattern, and it is arriving noticeably earlier than people expect. Here is how to read what you are looking at.

Termite swarms are triggered by a combination of colony maturity, temperature, and moisture. A colony has to reach a certain size and age before it produces reproductives at all, and then it waits for conditions — typically warmth followed by moisture, which is why swarms so often follow rain and why they cluster in the hours after a warm, humid afternoon.

This fall has been wetter than average, and that is the relevant variable. Rain earlier in the season, combined with the warmth still in the ground, produces conditions that bring swarms out sooner and make them more visible than a dry September would. We are not going to put a number on how much earlier or quote a sighting count, because nobody has a reliable regional figure and inventing one would not help you. What we can say is that the calls started earlier this year than they usually do, and that the pattern is consistent with what the weather has been doing.

The seasonal mechanics — which species swarms when, and the full month-by-month picture across the year — are covered in a separate piece linked at the end. This one is about what to do in the next hour.

This is the single most useful thing to know, because both swarm in the same conditions and get mistaken for each other constantly. If you can get a look at one — on a windowsill, in a web, on the floor — three features settle it.

The shed wings deserve special mention because they are what most people actually find. Termite wings come off readily once the insect has landed and is looking for a place to start a colony, so a small pile of identical translucent wings on a sill, in a sink or bathtub, along a sill plate, or caught in a spider web is close to a signature. Ants very rarely leave that evidence. If you find wings and no insects, that is still a finding worth acting on.

This is the distinction that determines whether you should be concerned, and it gets flattened in most coverage into a blanket "termites means panic," which is neither accurate nor useful.

Swarmers are fliers. A colony in a neighbor's fence, a utility pole, a tree stump, a woodpile, or a landscape timber can put reproductives into the air that land on your patio furniture, your driveway, your car, or the outside of your windows. Finding them outdoors tells you there is a mature colony somewhere in the vicinity, which in Southern California is close to a given, and it does not by itself mean anything about your structure.

It is still worth noting rather than ignoring. If you are seeing them outdoors repeatedly and in the same place each time, that is worth mentioning at your next inspection, because it may point at a source close to the building.

Swarmers emerging inside the house is a different finding, and this is the one that warrants a call. Reproductives that come out inside a structure came from a colony in or immediately against that structure — they did not fly in through a closed window. The same goes for shed wings found indoors on sills, in sinks and tubs, or along baseboards.

What it means practically: a colony has reached maturity, which takes years. It does not mean your house is about to collapse — termite damage accumulates slowly, and a swarm is not a sudden emergency. But it does mean the situation has been developing for a while without being noticed, and the useful response is an inspection rather than a product.

One more location worth knowing: swarmers appearing around a slab edge, an expansion joint, a bath trap, or a plumbing penetration point toward subterranean termites coming up through soil contact. Swarmers concentrated near eaves, window frames, attic access, or exterior trim point more toward drywood termites, which need no ground contact at all. Both are common here; they call for different treatment, which is another reason identification matters.

On timing: there is no need to treat this as a same-day emergency, and any company that tells you otherwise on the phone is worth a second look. Colonies that produce swarms have been there for years. What matters is that the inspection actually happens rather than getting deferred until the swarm is forgotten in November — which is the genuinely common failure mode, because swarms stop being visible long before the colony stops being active.