How Asian Subterranean Termites Spread Through Entire Neighborhoods

Asian subterranean termites spread through neighborhoods in three ways: workers tunnel underground from one food source to the next, winged swarmers fly out at night to start new colonies on nearby lots, and people move them in boats and infested wood. Once one mature colony is established on a block, every home within reach of its tunnels and swarms is at higher risk.

That is why a termite problem next door is your problem too. The Asian subterranean termite, Coptotermes gestroi, was first found in Miami in 1996 and has been spreading through South Florida’s cities ever since. This guide explains each route of spread, what it means for your home and what neighbors and communities can do together.

A Termite Built for Spreading

The Asian subterranean termite is a tropical species from Southeast Asia that UF/IFAS describes as a very damaging termite. In Florida, UF/IFAS has collected it from buildings, ornamental trees near buildings and boats.

Its Florida range has grown steadily:

• 1996: first found in the continental U.S., at a storefront and a church in Miami
• 1999: a colony found in a waterfront house in Key West
• 2005: established colonies found in Fort Lauderdale and Riviera Beach, adding Broward and Palm Beach counties
• 2026: a University of Florida study reported it as far north as Brevard County and Hillsborough County, with detection expected in all 24 of Florida’s southernmost counties before 2040

UF/IFAS identified Miami-Dade and Broward as the first counties where it became established alongside the Formosan subterranean termite. Both species build huge colonies, which is what gives them so much reach. For how those colonies are organized, see how Asian subterranean termites build massive hidden colonies.

Route 1: Underground Tunnels Between Properties

Workers forage outward from the nest through tunnels in the soil, following moisture and wood. UF/IFAS Extension in Monroe County describes these tunnels reaching up to 300 feet from the central nest. On a typical South Florida street, that is enough to pass under fences, driveways and sidewalks and reach several neighboring homes.

When UF/IFAS scientists modeled future risk in South Florida, they treated any structure within 500 meters of a recorded Asian or Formosan subterranean termite as at risk. Using that approach, they projected in 2016 that about half of the structures in South Florida could be at risk by around 2040, and a 2026 follow-up study found the forecast on track.

Underground spread is most likely where:

• Homes, townhouses or duplexes sit close together or share slabs and walls
• Irrigation keeps soil along foundations constantly moist
• Wooden fences, landscape timbers and trellises run between lots
• Old stumps or buried construction wood remain in the soil

Route 2: Nighttime Swarms

Swarming is how a mature colony starts new ones. Asian subterranean termites fly at dusk or at night, mainly from February to April in Florida, and UF/IFAS Extension notes swarming begins in early March in South Florida. Large numbers of winged termites leave the colony at once. A 2015 UF/IFAS study found that Asian and Formosan subterranean termites can swarm at the same time, together releasing hundreds of thousands of winged termites.

Lights pull them toward homes. Porch lights, indoor lights and even video screens draw swarmers inside when doors or unscreened windows are open. UF/IFAS describes a 2004 swarm in a Key West hotel room at 1:30 a.m. in which many swarmers crawled into the guests’ luggage and clothing.

Most swarmers die before starting a colony; indoors, they usually dry out quickly. But UF/IFAS notes that most flights likely produce a few new colonies that can become a damage threat years later. Learn the timing of every species in our guide to termite swarming in Florida.

Route 3: Boats, Wood and Other Rides

People move termites much farther than termites can travel on their own. UF/IFAS considers infested boats the most likely human-made route for Asian subterranean termites, because swarmers flying from a boat can reach land. Infested private boats arriving from Jamaica, Virgin Gorda and Providenciales in the Turks and Caicos were found docked in Fort Pierce, Hollywood and Fort Lauderdale, and another infested boat turned up in the Keys.

A 2025 University of Florida study found that boats are ideal vessels for spreading Formosan, Asian and West Indian drywood termites. Colonies can live aboard, swarmers are drawn to city lights onshore, and once established on land they can infest other boats. With South Florida known as the yachting capital of the world, waterfront neighborhoods deserve extra attention.

Wood is the other common ride. UF/IFAS notes that large pieces of infested wood, such as railroad ties or salvaged timbers, can carry enough termites to start a colony. Garden mulch is much less of a concern: termites in chipped mulch survive poorly once separated from their colony.

Route 4: Trees and Shared Green Spaces

Subterranean termites do not only eat buildings. UF/IFAS has collected Asian subterranean termites from ornamental trees near buildings, and UF/IFAS Extension warns that subterranean termites can feed deep inside living trees, which can look healthy until they collapse, especially during storms. An infested tree in a park, a swale or a common area can feed a colony for years while workers forage toward nearby homes.

Mud tubes running up bark or appearing at pruning wounds are an early warning, and they are worth reporting to the property owner or association.

Signs Your Neighborhood Has Termite Activity

Why One Home’s Problem Becomes Everyone’s Problem

Termite colonies are slow to reveal themselves. By the time someone sees damage, swarms or tubes, the colony may have been active for a long time, and University of Florida researchers point to the cryptic biology of these termites, which helps colonies go unnoticed. Meanwhile it keeps producing swarmers that land on the rest of the block.

UF/IFAS researchers have suggested that area-wide termite management, treating colonies across a neighborhood instead of one house at a time, could be a long-term solution. In practice, it starts with neighbors sharing information and communities making inspections routine. Associations have specific responsibilities here, covered in how subterranean termites can destroy HOA property values.

How to Protect Your Home When Termites Are Nearby

1. Get an inspection. If a neighbor has confirmed Asian or Formosan subterranean termites, schedule your own inspection rather than waiting for signs.
2. Dry out the foundation. Fix leaks, keep gutters working and keep sprinklers off the walls.
3. Keep the foundation visible. Thin mulch and a clear strip of about 6 inches make mud tubes easy to spot.
4. Remove wood-to-soil contact. Move firewood and lumber away from the house and replace rotted fence posts and landscape timbers.
5. Watch the lights. Reduce outdoor lighting during swarm season.
6. Check trees and boats. Look for mud tubes on trunks near your home, and inspect any boat you keep at a dock.

Toro’s termite control service starts with a free inspection that identifies the species and how far the activity reaches. For subterranean termites, Toro installs the Sentricon baiting system around the property with no drilling into the slab and no trenches; termites carry the bait to the colony, which is designed to eliminate it, including the queen, and the stations stay in place for year-round protection against new colonies arriving from nearby. Toro treats homes, condos and commercial properties across Miami-Dade, Broward, Palm Beach and the Keys and can coordinate with your association or property manager. For more about every termite we see in South Florida, browse our termite pest library.

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Frequently Asked Questions

Educational content. This article is for general information about pests in South Florida and is not medical, legal or professional advice. If you have a bite, sting or allergic reaction, contact your doctor; in an emergency, call 911. Pest problems vary from home to home, so a licensed professional should inspect before treatment. When using any pesticide, always read and follow the product label.

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