When do termites swarm?
Termites swarm, releasing winged reproductives to start new colonies, on warm, humid days, usually in spring for the most common species. But the exact timing depends on which termite it is and where you live, and the weather has to cooperate on the day. Rather than guess from a fixed calendar, check the live swarm-risk forecast for your own city:
Swarm season by termite
Subterranean termite
They swarm on warm spring days, usually in daylight and often within a day or two of rain, as the soil warms. A swarm indoors almost always means an established colony nearby.
Formosan termite
It swarms at dusk on warm, humid, still evenings from late spring into early summer, the huge flights the New Orleans area is known for around Mother's Day. Swarmers fly to lights by the thousands.
Drywood termite
They swarm on warm late-summer and fall days, flying straight out of infested structural wood rather than up from the ground.
Desert subterranean termite
It swarms on warm nights after the summer monsoon rains, roughly July into September across the desert Southwest.
Why the day matters, not just the month
Even in peak season, a colony holds its flight for the right conditions: a warm day, high humidity, and often the calm hours after rain. That is why swarms across a region tend to cluster on the same few days, and why a cool, dry stretch in spring can pass with no flights at all.
TermiteZone folds live temperature, humidity, and recent rainfall into each day's score, so it reflects whether today is genuinely a flight day for the termites that live where you are, not just whether it is the right time of year. See how the score works.
Saw a swarm indoors?
Winged termites inside almost always mean an established colony in or under the structure. It is worth getting an inspection. We can connect you with a vetted local termite pro for a free, no-obligation quote.