Florida termite swarms follow a calendar that depends on the species. The statewide timings from UF/IFAS are the only ones on this page with a source. No Tampa-specific swarm dates have been confirmed, so the calendar is read as a Florida-wide guide, and this page says where that matters.
Key takeaways
- The Asian subterranean flight is reported for March and April, the Formosan flight for April and May, and the West Indian drywood flight for May and June. Those are statewide timings, not Tampa dates.
- Swarmers come out at dusk, often drawn to lights, and a swarm is a sign that a colony has produced reproductives.
- Shed wings on a windowsill, a patio or a porch floor are a stronger clue than a single insect on the glass.
- A swarm does not confirm a colony inside the building, and a colony can exist with no visible swarm. Only an inspection tells you which.
- Do not spray a swarm or seal the hole it came from before a technician has looked at it. The evidence is useful.
March and April: the Asian subterranean flight
Asian subterranean termites are the species with the most local interest, because UF/IFAS has confirmed that they are established in South Tampa.
UF/IFAS places the peak flight of the Asian subterranean termite in March and April across Florida. The species is tropical, and its presence in South Tampa was confirmed in 2023 by UF/IFAS researchers working from samples that pest control operators submitted. A full treatment of that finding is on the page about the species itself, but the calendar matters here because the spring flight is the window in which most homeowners first see one.
The flight happens at dusk on warm, humid evenings. A homeowner who sees a cloud of winged insects around a porch light in March or April should keep the wings and the insects and note the time and the place. The insects are reproductives leaving a colony that already exists somewhere near the building. The swarm tells you the colony is close enough to be worth finding; it does not tell you how much damage has already been done.
April and May: the Formosan flight
Formosan subterranean termites are present across Florida's urban centers, but this page does not say they are established in Tampa.
UF/IFAS places the statewide Formosan flight in April and May. The species is common in many Florida cities, and a swarm of it looks much like any other subterranean swarm to a homeowner. That is why the identity of the species is a question for a technician and a sample, not for a glance at the insects.
Two species can fly in the same weeks, and an inspection report should name the one it found. This page does not state that Formosan termites are present in Tampa specifically, so a homeowner should not read the calendar as a local confirmation.
May and June: the drywood flight
West Indian drywood termites fly in May and June across Florida, and they do not need contact with soil the way subterranean species do.
Drywood termites live inside the wood they eat and do not need to reach the ground, which makes them a different kind of problem from a subterranean colony. A drywood colony can be inside a piece of furniture, a window frame or a roof timber for a long time before anyone notices the damage. The May and June flight is the window in which swarms are most likely to be seen, and a swarm inside a room is a reason to call rather than a reason to wait.
Because drywood termites are a separate category in Florida licensing as well as in treatment, a homeowner should ask whether the technician is qualified for that work. The category is covered in the license guide on this site.
June through October: the rainy season and the swarm you can miss
Rain changes when people notice termites and what they mistake for them, and the rainy season is also when a colony's signs are easiest to lose.
The National Weather Service Tampa Bay office defines the rainy season for most of West Central Florida as running from 25 May to 10 October, and it says those dates are not firm lines. In those months a homeowner is dealing with frequent storms, wet soil and heavy humidity, which together make a swarm easy to miss. Wings wash away, insects are caught by the rain, and the ground that would show mud tubes is soft and quickly covered with fresh growth.
The rainy season is also when many people are busy clearing gutters and yards after a storm, and that is when a shed wing or a small hole in the mulch is most likely to be swept up with the debris. Keeping a simple note of what you see, and when, is worth the effort during these months.
How to tell a swarm from flying ants
The clearest differences are in the waist, the antennae and the wings, and a single insect is not enough to decide.
Flying ants and swarming termites are easy to confuse from a distance. Both come out in numbers, both are winged, and both can gather at a light. Up close, the differences are clear enough for a homeowner to use as a first sort, and the list below sets them out. None of these points is a substitute for an inspection, and a technician will confirm the identity from the insect itself.
- Waist: flying ants pinch in sharply at the middle; swarming termites have a broad, even body with no narrow waist
- Antennae: ants have elbowed antennae; termites have straight, beaded antennae
- Wings: termite wings are of roughly equal length and are shed in pieces after landing, often in a pile
- Location: a swarm at a light fixture at dusk fits termites, but one insect on a windowsill proves nothing either way
What to do after a swarm
Keep the evidence, photograph it, and call for an inspection instead of treating it yourself.
A swarm is a reason to have the building inspected soon. It is not a reason to panic, and it is not a reason to spray. The steps below keep the evidence a technician needs and avoid disturbing anything before the inspection.
If you can, put the wings and a few of the insects in a sealed container or a clear bag, so the technician can see them. A photograph taken with something for scale is also useful. Write down the date, the time of day and where the swarm was. All of that helps the inspection focus on the right place.
- Do not spray the insects, the wings or the hole they came from
- Leave the discarded wings where they are, or collect a few in a sealed bag
- Photograph the swarm, any mud tubes and the spot where the swarm came from
- Note the date, the time of day and the weather
- Call (855) 974-4733 and ask for an inspection, and say what you saw and where
Calendar at a glance
The table lists the windows in the order they arrive, with a note on where each one comes from.
Use the table to decide when to look, not as a promise that a swarm will appear on a given day. A calendar shows when swarms are most likely to be seen. It does not show when a colony is present, because a colony can be present for years without a single visible swarm.
| Window | What to watch for | Source status |
|---|---|---|
| March to April | Asian subterranean swarms at dusk | UF/IFAS statewide timing |
| April to May | Formosan swarms | UF/IFAS statewide timing |
| May to June | West Indian drywood swarms | UF/IFAS statewide timing |
| 25 May to 10 October | Rainy season: wet soil, lightning and storm weather | National Weather Service; dates are not firm |
| Year round | Termite damage can be found at any time of year | General inspection practice |
Why the swarm dates shift from year to year
A calendar gives windows, and the windows move with the weather, the colony's age and the season's rain.
A swarm is produced when a mature colony is ready to send out reproductives, and that readiness depends on the colony's condition as much as on the date. A strong, well-fed colony may send its winged insects out in a window that is early or late compared with the statewide timing. A hot, dry spring can hold a swarm back, and a wet spell that breaks the heat can bring one out in a rush over a single evening.
That is why a homeowner should read the calendar as a set of likely windows. The statewide timings from UF/IFAS are the best published guide to when each species is usually seen, and they are the right reference for planning when to look. They are not a schedule that a particular colony will keep, and they should not be used to decide that a sighting outside the window is harmless.
Where swarmers gather, and why a light gives the game away
Swarmers are drawn to light at dusk, so the place they gather points to the building, the fixture and the window they came in through.
Swarming termites fly toward light and collect on window screens, porch lights, garage doors and the glass of a patio door. Because they arrive in numbers, a cluster of wings on the floor beneath a fixture is often the clearest sign a homeowner will ever see. The wings are shed soon after landing, which is why a pile of them on a sill can be found the morning after a swarm.
The place where the wings collect is worth noting. A pile by a door frame, under a window, or at the base of a wall points an inspector toward the part of the building where a colony may be feeding. A pile in a lawn or a flower bed points toward the ground and the roots of the structure rather than a particular opening. Take a photograph before the wings are swept away, because the location is the evidence.
What the calendar cannot tell you
A calendar does not show whether a colony is in the building, how long it has been there, or how much wood has been damaged.
The swarm calendar is a tool for timing a look, and it is a poor tool for judging a risk. Termites can feed inside a wall for a long time without any swarm reaching the outside. A colony can produce no visible swarm in a given year, and a building can have an active colony with no swarm ever seen by the owner. The only reliable answer to whether a colony is present is an inspection that looks at the structure, the moisture and the signs the colony leaves behind.
For the same reason, a quiet spring is not a reassurance. A homeowner who has seen a swarm once should keep an inspection on the calendar for the coming year, even if nothing else has been noticed. The cost of an inspection is small next to the cost of finding out late that the floor joists were eaten from the inside.
Frequently asked questions
Can termites swarm in winter in Tampa?
The sourced statewide timings put the main swarms in spring and early summer. This page does not give winter swarm dates for Tampa, so a winter sighting should still be looked at by a technician.
Is a swarm an emergency?
It is a reason to book an inspection soon rather than a reason to panic. A swarm shows that a colony exists nearby. Keep the evidence and call (855) 974-4733.
Does a swarm mean my house is infested?
Not necessarily. A swarm shows a colony somewhere close by, which may be in a tree, a stump or a neighbor's property. Only an inspection of your building can say whether the colony is inside it.
Why do swarms seem to follow rain?
Swarms are most often seen in warm, humid weather, and the rainy season is when those conditions are common. The timing shifts with the weather, which is why the calendar gives windows rather than days.
Do swarms happen at the same time every year in one place?
Roughly, but not exactly. The windows are a guide and the weather moves them, so a sighting a few weeks outside the usual window is still worth reporting to a technician.
What should I write down if I see a swarm?
The date, the time of day, the weather, where the insects were, where the wings collected, and whether there were mud tubes or damp wood nearby. A photograph of each location helps the technician plan the inspection.
Sources
This guide is general information for Hillsborough County homeowners, not a substitute for an on-site inspection. Prices are estimates. See our disclaimer.