Termite Swarm Season: When Each Species Flies

Termite swarm season is not a single calendar event. Most subterranean termites swarm in spring on warm afternoons after rain, while other species fly in winter, at dusk, or during summer and fall depending on the region.

When is termite swarm season?

The exact month depends on the termite species and your location, In Florida the first native flights start in December, and in California some species still fly in the fall.

Termite	Where the source measured it	When it swarms	Time of day	Source
Eastern subterranean termite (Reticulitermes flavipes)	Florida	Early January to April	Warm, sunny, windless early afternoons, usually after rain	UF/IFAS
Reticulitermes virginicus, a native subterranean termite	Florida	Early February to late May	Early afternoon, as above	UF/IFAS
Reticulitermes hageni, a native subterranean termite	Florida	Early December to early February	Evening	UF/IFAS
Asian subterranean termite (Coptotermes gestroi)	Florida and the West Indies	February to April	Dusk or night	UF/IFAS
Formosan subterranean termite (Coptotermes formosanus)	Florida	Early April to late June, peak in May	Shortly after sunset	UF/IFAS
West Indian drywood termite (Cryptotermes brevis)	Florida	April to June, though flights are possible any time of year	not given	UF/IFAS
Native subterranean termites (Reticulitermes)	California	Spring or fall	Afternoon, on clear days after a soaking rain	UC IPM
Western drywood termite	California	Summer and fall	Daytime	UC IPM
Dampwood termites	California	Summer and fall	After dark, drawn to lights	UC IPM

Keep in mind that the Florida months shown above reflect field measurements taken in Florida. If you live further north, the same species generally starts its flights later in the year, so treat those months as an order of events rather than fixed calendar dates for other states. UF/IFAS notes that the time of day and time of year for dispersal flights varies by species and location, a fact UC IPM echoes for western populations.

When identifying native subterranean termites outside of Florida, expect their seasonal timeline to shift with local outdoor temperatures while keeping the same basic weather triggers.

What time of day do termites swarm?

Termites swarm either in the early afternoon, at dusk, or after dark, depending entirely on the species.

Native subterranean species fly during warm, sunny early afternoons, according to UF/IFAS and UC IPM. In contrast, Reticulitermes hageni disperses in the evening. The Formosan termite and Asian subterranean termite take flight at dusk or during the night.

UF/IFAS notes that porch lights, indoor lighting, and television or video monitors frequently attract Asian subterranean alates inside when doors or unscreened windows remain open. UC IPM similarly reports that Formosan subterranean termites swarm at dusk and are attracted to lights.

A swarm gathering around your porch light after sunset and a swarm crowding a sunny window pane at two in the afternoon are probably two different species. Determining whether you are looking at subterranean termites against drywood species starts with noting the exact hour you spotted them.

What sets off a swarm?

For subterranean termites, the signal is a warm, sunny day after rain.

UC IPM states that swarms of reproductives may emerge en masse on warm, sunny days following fall or spring rains. Springtime, particularly a warm day right after precipitation, offers the optimal conditions for subterranean flights and gives homeowners a brief chance to see where termites come out in the home.

When these conditions align, the volume can be massive. UF/IFAS reports that Formosan subterranean termite dispersal flights can contain tens of thousands of individuals at once.

How long does termite swarm season last?

A single swarming event inside a home finishes within a few hours, while the overall swarm season for a given species spans several weeks to a few months.

For an indoor emergence, the event is brief. The University of Kentucky Department of Entomology notes that swarming termites emerging indoors cannot damage wood, and they survive for only about a day.

UF/IFAS adds that after indoor flights, most Reticulitermes alates are found dead near window sills, sinks, or bathtubs, usually with their wings still attached. Wings that do come off collect in a pile of shed wings, which says where the swarmers ended up.

When do termites swarm in California?

California termite swarms occur across spring, summer, and fall, depending on whether the species is subterranean, drywood, or dampwood.

If you are looking at options for Los Angeles termite control or San Jose termite control, local climate patterns dictate the seasonal timing. UC IPM outlines seasons rather than calendar months for the state: native subterranean termites fly in spring or fall following rain, while western drywood termites fly during daytime hours in summer and fall. Dampwood termites also swarm during summer and fall, but they fly after dark and move toward light sources.

UC IPM notes that the Formosan termite remains restricted to a small established area near San Diego. In parts of southeastern California, another drywood species (Marginitermes hubbardi) and desert subterranean termites may also swarm to lights. Because drywood termites live deep inside timbers, UC IPM emphasizes that they are rarely seen until they swarm.

Does a termite swarm mean my house is infested?

An indoor swarm almost always means your house has an active infestation, whereas an outdoor swarm in your yard may not.

UF/IFAS reports that residents usually become aware of an underlying infestation when annual dispersal flights erupt, releasing hundreds to thousands of winged adults. The US Environmental Protection Agency confirms that most homeowners remain unaware of termites until they see a swarm or stumble across structural damage.

These flights do not happen in new colonies. UF/IFAS notes that a newly founded native subterranean colony may take five to 10 years to mature enough to produce swarming alates, while West Indian drywood colonies require roughly five years before sending out flights. When winged termites emerge inside your living space, that timing points to a colony that has been there for years rather than weeks.

The University of Kentucky states that winged termites indoors almost always indicate an active infestation warranting treatment. However, swarms emerging from tree stumps or woodpiles out in the yard do not automatically mean your house is infested. On the other hand, if you see swarmers coming up next to your foundation or from an abutting porch or patio, the University of Kentucky says there is a good chance the house is infested. You can double-check for other structural clues by reviewing my guide to the signs of termites.

Is it termites or flying ants?

Flying ants and swarming termites often emerge during the exact same warm spring and summer months, but distinct physical characteristics separate the two.

My flying ants vs. termites page has the key.

What should I do during swarm season?

You should capture sample insects, document where they emerged, vacuum the remaining swarmers, and arrange a professional inspection.

If the swarm is happening now, my page on flying termites in the house gives the first hour step by step.

A swarm originating from an established colony inside your home cannot be stopped by treating the air or surfaces, and applying off-the-shelf sprays to winged adults does nothing to destroy the underlying nest. I cover what a spray does and does not reach in my guide on termite sprays and killers.

When a swarm breaks out indoors, take these steps in order:

• Collect a few intact swarmers or shed wings and store them inside a sealed plastic bag or glass jar for identification.
• Take clear photos of the exact exit holes, wall seams, or window frames where you saw the insects emerging.
• Vacuum up the dead or dying insects around windows and floors, then throw the vacuum bag into an outdoor bin.
• Close unscreened windows and turn off exterior porch lights at dusk if dusk-flying species are active in your area.
• Without opening walls, check nearby baseboards and foundation edges for external mud tubes using my guide to mud tubes.
• Check exposed wooden surfaces for small sand-like droppings by referring to my page on drywood pellets.
• Schedule a detailed check-up with a qualified technician through a termite inspection service.

Do not let the sudden appearance of flying insects push you into signing a contract that day. The University of Kentucky stresses that termites damage wood slowly, and that the damage from taking an extra day, week, or month to decide generally is inconsequential.

If you want to reduce future risk around the yard, review my termite prevention guide for structural moisture and soil-separation steps. If you are still unsure whether the insects you saw were actual swarmers, use my termite decision walkthrough to clarify what you found.

My recommendation for handling swarm season

My advice for any homeowner facing a swarm is simple: learn which rows of the timing table match your specific region, treat any indoor emergence as a reason to book a termite inspection rather than a treatment, save physical samples, and never let a pushy sales pitch pressure you into signing an immediate treatment contract.

Keep in mind that I have not seen your house or inspected your property, so getting a qualified technician on site to evaluate physical evidence is always necessary. A swarm inside your living space indicates a mature colony is nearby, but a few days spent collecting samples and comparing inspection findings generally costs the wood very little.

Sources

• Native Subterranean Termites: Reticulitermes flavipes, R. virginicus, R. hageni (EENY-212) — University of Florida IFAS Extension, Featured Creatures, undated. Accessed 2026-09-30.
• Formosan Subterranean Termite, Coptotermes formosanus Shiraki (EENY-121) — University of Florida IFAS Extension, Featured Creatures, undated. Accessed 2026-09-30.
• Asian Subterranean Termite, Coptotermes gestroi (EENY-128) — University of Florida IFAS Extension, Featured Creatures, undated. Accessed 2026-09-30.
• West Indian Drywood Termite, Cryptotermes brevis (EENY-079) — University of Florida IFAS Extension, Featured Creatures, undated. Accessed 2026-09-30.
• Pest Notes: Subterranean and Other Termites (Publication 7415) — UC Statewide IPM Program, 2014-05. Accessed 2026-09-30.
• Pest Notes: Drywood Termites (Publication 7440) — UC Statewide IPM Program, 2014. Accessed 2026-09-30.
• Termite Control: Answers for Homeowners (ENTFACT-604) — University of Kentucky Department of Entomology — Michael F. Potter, 2026-03. Accessed 2026-09-30.
• Termites: How to Identify and Control Them — US Environmental Protection Agency, 2025-10-21. Accessed 2026-09-30.