Short answer: On the Gulf Coast, subterranean termite swarm season runs from late winter through early summer. Asian subterranean termites fly first, from mid-February into spring, and Formosan termites peak April through June on warm, humid evenings. Winged termites or shed wings indoors mean a mature colony is nearby, and year-round baiting is the fix around Mobile, Foley, and Spanish Fort.
Swarming is tied tightly to species and weather. Long-term monitoring in the Southeast found distinct but overlapping flight seasons for our two biggest subterranean threats.
Because our winters are mild, termites keep feeding nearly year-round. Swarm season is when you see them, not the only time they are working on your house.
Temperature is the trigger. Low temperature is the single biggest factor suppressing flights, so when it is cool, termites do not fly. Once colonies are mature, swarms break out on warm, humid evenings, frequently right after rain.
That is why you often see swarmers around porch lights or window sills the evening after a spring shower. Piles of shed wings on a sill the next morning are the classic sign.
Survey records show Mobile and Baldwin counties carry Alabama's highest concentration of Formosan infestations, where the species is considered widespread. Across the state line, monitoring confirms Formosan termites are now established in most of Florida's coastal counties.
Warm temperatures and high humidity, which is exactly our climate in Mobile, Foley, and Spanish Fort, let these colonies thrive. Formosan colonies are large and aggressive, so an untreated home here is a real gamble.
Yes. While swarms are a spring-and-early-summer event, the colonies feed far longer. Research found subterranean termites keep feeding through mild winters as long as average soil temperatures stay above about 59 F (15 C), and only prolonged cold slows them.
On our coast, soil rarely stays that cold for long. Protection that only shows up in spring leaves the house exposed for most of the year.
We use a Sentricon-style baiting and monitoring program that works nearly year-round. Our technicians place and check stations around the structure, so foraging termites pick up bait and carry it back to the colony no matter what month it is.
If you have seen swarmers or wings, we start with an inspection to confirm the species and find where activity is concentrated. Then we set up ongoing monitoring so the colony is dealt with and the home stays protected after swarm season ends.
When do termites swarm in coastal Alabama and Northwest Florida? Late winter through early summer. Asian subterranean termites fly mid-February into spring, and Formosan termites peak April through June, usually on warm, humid evenings after rain.
What triggers a termite swarm? Warmth and humidity. Cool temperatures suppress flights, so mature colonies send out swarmers on warm, humid evenings, often right after a rain.
Are Formosan termites common on the Gulf Coast? Yes. Mobile and Baldwin counties have Alabama's highest concentration of Formosan infestations, and Formosan termites are now established in most coastal Florida counties.
Does termite baiting work in winter? Largely yes. Termites keep feeding while soil stays above about 59 F (15 C), and only prolonged hard cold slows them, so bait monitoring continues nearly year-round here.
Does seeing swarmers mean my house is infested? Not always, but it means a mature colony is close by. Winged termites or shed wings indoors are a strong sign the colony is in or under the structure, so get an inspection promptly.
Do not wait for swarm season to protect your Mobile, Foley, or Spanish Fort home. Call 251-210-7263 or request a visit online.
EnSec Pest & Lawn is a family-owned pest control, termite, and lawn care company founded in 1997, with offices in Cantonment and Panama City Beach, Florida, and Mobile and Foley, Alabama. Our team includes Certified Pest Control Operators in Florida and Alabama and an Associate Certified Entomologist, and we are members of the National Pest Management Association with an A+ rating from the Better Business Bureau (License #2004227). This article was written and reviewed by the EnSec team and last updated September 2026.
EnSec Pest & Lawn has been protecting Gulf Coast homes since 1997. Get a free estimate today.
