Every termite colony begins with a single mating pair. Once a year, mature colonies release thousands of winged termites called alates into the air. These swarmers fly out, pair up, shed their wings, and burrow into the ground or wood to start a brand-new colony from scratch. Understanding this process explains both how termites spread in nature and how infestations take hold in homes.
The Swarm That Starts It All
Termite colonies produce winged reproductive males and females once they reach maturity, which takes roughly five years or more. When conditions are right, typically warm temperatures after a rain, these winged termites leave the nest in large numbers. The swarm can look like a cloud of small, pale insects near the ground, often mistaken for flying ants.
During the flight, females release a chemical signal from a gland on their abdomen that attracts males. A male finds a female, and the two form a distinctive “train,” with the female leading and the male following close behind as they race across the ground searching for a nesting site. Once they find a suitable spot, the pair drops their wings permanently. You can sometimes find these discarded wings in small piles on windowsills, porches, or near foundation walls.
Building the First Nest
After pairing up, the new king and queen dig a small chamber in soil or wood, depending on the species. This first room, called a copularium, is sealed off with a mixture of dirt and saliva. The pair isolates themselves completely inside, and within about a week the queen begins laying her first eggs.
The initial brood is tiny. The king and queen care for the first batch of eggs and young termites themselves, feeding them and maintaining the chamber. These first offspring become workers, and once they mature, they take over all nest-building, foraging, and caretaking duties. From that point, the queen’s sole job is laying eggs, and the colony grows exponentially. Some species, like the Formosan subterranean termite, eventually reach populations of several million.
How Different Species Start Colonies
Not all termites set up their colonies the same way, and the differences matter for homeowners because each type targets different conditions.
Subterranean termites are the most common and destructive group. The mated pair digs into soil and begins laying eggs immediately. The colony stays underground, and workers build mud shelter tubes up foundations and walls to reach wood above. New colonies can also form when an existing colony splits, meaning a single property can develop multiple active colonies over time.
Drywood termites skip the soil entirely. A mated pair flies directly to a piece of dry, sound wood, such as a roof eave, fence, deck railing, or even furniture, and burrows in. The entire colony lives inside the wood with no connection to the ground. This makes them harder to detect early because there are no mud tubes to spot.
Dampwood termites nest in wood that stays consistently wet, either from soil contact or water leaks. They’re most common in cool, humid coastal areas. They carve out large open galleries inside the moist wood where they live and feed.
What Attracts Termites to a Home
A mated termite pair looking for a nest site is drawn to two things above all else: moisture and easy access to wood. Any situation where wood contacts soil gives termites a direct path into a structure. Common examples include soil or mulch piled against the foundation, wooden stakes or form boards left in the ground after construction, firewood stacked against the house, and wooden debris or stumps left under a crawl space.
Moisture is equally important. Leaking roofs, plumbing drips, air conditioner condensation, poor ventilation in crawl spaces, and flashing gaps around chimneys or skylights all create the damp wood that termites thrive in. Even something as simple as letting leaves or pine straw accumulate against the foundation can trap enough moisture to create ideal conditions. Buildings with foam insulation or stucco that extends below the soil line are particularly vulnerable because termites can travel behind these materials undetected.
Early Signs a Colony Has Started
Because a new termite colony grows quietly for years before causing visible damage, catching an infestation early depends on knowing what to look for. The most obvious sign is swarmers emerging from walls, ceilings, or floors inside your home, or finding piles of shed wings indoors. That means a colony has already matured inside or very near the structure.
For subterranean termites, mud shelter tubes are the telltale evidence. These pencil-width tunnels made of soil and saliva run up foundation walls, support piers, plumbing pipes, or even interior walls and ceilings. Sometimes the only visible clue is BB-sized spots of dried mud on drywall or narrow, sunken winding lines beneath paint or wallpaper where termites have been feeding just below the surface.
Drywood termites leave a different signature: small piles of uniform, six-sided pellets (their droppings) on floors or countertops below the infested wood. Because these termites live entirely inside the wood, you won’t see mud tubes. More advanced infestations show up as sagging floors, a soft or broken door frame, or damage discovered during remodeling.
Preventing New Colonies From Taking Hold
Prevention comes down to eliminating the conditions that make your home attractive to a nesting pair. Keep all soil, mulch, and leaf litter at least several inches below any wood or siding. Remove any buried wood debris, old form boards, or stumps near the foundation. Store firewood and lumber away from the house, not leaned against it. Fix moisture problems promptly, whether that’s a slow plumbing leak, condensation drip, or poor crawl space ventilation.
For active protection, the two main approaches are liquid soil treatments and bait stations. Liquid treatments create a chemical barrier in the soil around the foundation. The most effective modern products are non-repellent, meaning termites can’t detect the treated zone and pass through it, picking up a lethal dose they carry back to the colony. Bait stations take a different approach: small monitoring devices are placed in the soil around the home, checked periodically, and loaded with a slow-acting toxin when termite activity is found. The foraging workers share the bait with nestmates, gradually eliminating the colony. Both methods require professional installation and ongoing monitoring to remain effective over time.