Termite Season in Tampa Bay: Swarm Months and Signs
Around Tampa Bay, native subterranean termites generally swarm in spring, often from late winter through May, usually on warm days after rain. Formosan subterranean termites swarm later in spring and into early summer, at dusk, around outdoor lights. Drywood termites swarm later still, through spring and well into summer. Warning signs are mud tubes, discarded wings on windowsills and six sided frass pellets.
The phone starts ringing here on the first warm afternoon that follows a good soaking rain. Somebody walks into the living room and finds a scatter of translucent wings on the windowsill, or a cloud of flying insects under the porch light that was not there the night before. That is a swarm, and it is the one part of a termite colony’s life you are likely to see.
Swarming is how mature colonies reproduce. Winged reproductives leave the nest, fly, pair off, drop their wings and try to start somewhere new. The flight itself lasts minutes. What it tells you is that a mature colony is nearby, either in your house or close to it.
When do termites swarm around Tampa?
Nobody can give you a date. Swarms are triggered by temperature, day length and rainfall, so they shift year to year and they differ by species. What holds up is the general order in which the species fly.
| Type | Usual swarm window | What a swarm looks like |
|---|---|---|
| Native subterranean termites | Spring, often late winter through May | Daytime flights, often mid morning, after rain |
| Formosan subterranean termite | Later spring into early summer | Evening flights at dusk, heavy around lights |
| Drywood termites | Later spring through summer | Smaller flights, often in the afternoon or at dusk |
Formosan swarms are the ones people remember. They come out after dark in numbers, gather around porch lights and streetlights, and leave drifts of wings on the doorstep by morning. UF/IFAS notes a smaller second Formosan flight in the fall in some years, so an autumn swarm is worth taking seriously rather than dismissing.
Does a swarm mean my house has termites?
It means a mature colony is within flight range. Whether that colony is feeding on your structure is a separate question, and it is the question an inspection answers.
Two details tilt the odds. Where the swarm happened matters more than that it happened: wings piled on an interior windowsill or in a bathtub point at something inside the building envelope, while a swarm out by the street is weaker evidence. So does the count. A handful of wings on a porch is common in Tampa in spring. A pile of them inside a closed room is not.
What are the warning signs between swarms?
Swarms only last minutes, and a colony can feed for years without producing one you happen to see. These are the things to look for the rest of the year.
- Mud tubes about the width of a pencil running up foundation walls, block piers, slab edges or the inside of a crawl space. Subterranean termites build them to stay in contact with soil moisture.
- Discarded wings, all the same size, collecting in window tracks, on sills, in spiderwebs or in a bathtub.
- Small piles of frass under trim, baseboards, window sills or wooden furniture. Drywood termite pellets are hard, six sided and about the size of coarse ground pepper.
- Wood that sounds hollow when you tap it along a baseboard or door frame.
- Paint that bubbles or ripples on a wood surface with no water source behind it.
- Doors and windows that suddenly stick in a spot that never stuck before.
- Tiny surface holes in wood trim, sometimes plugged with a bit of hard material.
Why is Tampa harder on houses than most places?
Three things stack up. Soil temperatures here stay warm enough for subterranean colonies to forage year round, so there is no dormant season that buys you time. Rainfall keeps the soil moist, and moisture is what subterranean termites need to survive away from the nest. And the Tampa Bay area carries both major subterranean species plus drywood termites, so a house can be exposed to more than one threat at the same time.
Older neighborhoods add their own pressure. The bungalows off Bayshore in South Tampa were built with real wood framing, wood siding and plenty of original trim, sitting on piers with crawl spaces underneath. That is good habitat. Newer slab construction is not immune either, because a slab crack or a utility penetration gives subterranean termites the soil contact they need.
What should I do in the week after a swarm?
Work through this in order.
- Collect a sample. Sweep some wings and a few insects into a sealed bag or a jar. Identification is easier with specimens than with a memory.
- Photograph where you found them. The location tells an inspector as much as the insect does.
- Leave the area alone. Do not spray a store bought product into the spot. Repellent products can push subterranean termites to move their foraging elsewhere in the structure, which makes the problem harder to find.
- Walk the foundation. Look for mud tubes at the base of walls, behind shrubs, around the AC pad and along the garage slab edge.
- Check the crawl space or attic access if you have one, with a flashlight, looking for tubes and for wings caught in webs.
- Book an inspection. A proper one covers accessible interior, exterior, attic and crawl space, and it should end with a written report of what was found.
Does the swarm month tell you which termite you have?
It narrows things. A heavy evening flight around lights in May points toward Formosan. A daytime flight in March points toward native subterranean. A small afternoon flight in July around an old window frame points toward drywood.
Timing alone is not enough to decide a treatment. Subterranean termites need soil contact and get treated with a liquid barrier or a bait system in the ground. Drywood termites live entirely inside the wood, so a soil treatment does nothing to them. Getting the species right before anyone quotes a price is the whole game. Our drywood and subterranean comparison walks through the differences in detail.
Booking an inspection
If you found wings this week, or a mud tube last month and forgot about it, get eyes on the structure. Our termite control page explains what the inspection covers and what the treatment options cost. The inspection itself is free, and you get a written report either way.