Termite holes are small openings in wood, drywall, or other surfaces created by termites as they tunnel, dispose of waste, or exit to swarm. They typically range from pinhole-sized (about the diameter of a BB) to roughly 1/16 of an inch across, and their appearance varies depending on the type of termite responsible. If you’ve spotted tiny holes in your walls or woodwork, understanding what you’re looking at is the first step toward knowing how serious the problem is.
Kick-Out Holes From Drywood Termites
Drywood termites create small, round “kick-out holes” in wood surfaces for one purpose: waste removal. These termites live entirely inside the wood they’re eating, and they periodically bore a tiny opening to push out their fecal pellets, called frass. The holes themselves are often difficult to spot because drywood termites plug them back up with cemented-together pieces of frass once they’re done cleaning house.
The more obvious clue is what comes out of those holes. Drywood termite frass consists of tiny, six-sided, oblong pellets that are remarkably uniform in size. Under magnification the hexagonal shape is distinct, but to the naked eye they look like fine dust or debris. Color ranges from light tan to nearly black depending on the type of wood being consumed.
Where the frass lands matters for detection. If a kick-out hole sits just a few inches above a flat surface like a windowsill or baseboard, the pellets tend to form a neat, noticeable little cone-shaped pile. But if the hole is higher up on a wall or ceiling, the falling pellets bounce and scatter, making them easy to dismiss as ordinary dust. If you’re finding small, gritty accumulations that reappear after you clean them up, that’s a strong sign of an active drywood termite colony overhead.
Pinholes From Subterranean Termites
Subterranean termites create holes differently. These termites travel through mud tubes and prefer to stay hidden, so any hole they make in an interior surface is usually an accident. When a worker tunnels through drywall or wood paneling and accidentally breaks through to the outside, it quickly patches the opening with mud. The result is a BB-sized spot of dried mud on your wall or ceiling.
These are called “pinholes” in the pest control industry. If you scrape away the mud, you’ll find a small hole underneath, and you may even see a termite come to investigate the breach. A useful test: mark the spot after scraping it and check back in a few days. If the mud reappears, the colony is active and workers are still repairing the opening.
Subterranean termites also leave subtler signs on walls that don’t involve visible holes at all. You might notice narrow, sunken winding lines or depressed trails beneath paint or wallpaper. This happens because termites eat the cardboard facing of drywall without touching the gypsum core or the thin paint layer on top. The surface stays intact but becomes hollow and fragile underneath, creating faint ripples or sunken tracks you can sometimes see in the right light.
Swarmer Exit Holes
Once a year, mature termite colonies produce winged reproductive termites (swarmers) that need to leave the nest to start new colonies. They exit through small holes in wood or drywall, often in clusters. You might find these holes alongside discarded wings on windowsills or near light sources, since swarmers are attracted to light. Swarmer exit holes from subterranean termites are typically small and round, and you may find them sealed with mud after the swarm event is over. Drywood termite swarmers leave similar small openings in wood surfaces.
Termite Holes vs. Other Insect Damage
Not every small hole in wood is from termites. Two other common culprits leave holes that look similar at first glance but have key differences.
- Powderpost beetles bore perfectly round exit holes ranging from about 1/32 to 1/3 of an inch in diameter. The frass they leave behind is a fine, flour-like powder rather than the gritty, six-sided pellets of drywood termites. Beetle holes also tend to be cleaner and more uniformly round.
- Carpenter ants excavate wood but don’t eat it. Their damage looks messier, with a more cavernous, torn appearance and visible striations inside the galleries. Carpenter ant frass contains wood shavings mixed with insect body parts, which looks distinctly different from termite pellets or beetle dust.
Termite damage to wood typically creates a thin, layered internal structure. If you can probe a suspected hole with a screwdriver and the wood feels papery or collapses in sheets, that’s characteristic of termite feeding. Subterranean termite infestations are also often preceded by mud tubes running along foundation walls or in the soil around the building, which neither beetles nor carpenter ants produce.
Where Termite Holes Commonly Appear
Drywood termite kick-out holes show up wherever the colony is feeding: window frames, door frames, baseboards, exposed beams, furniture, and hardwood floors. They’re most common in coastal and southern regions where drywood species thrive.
Subterranean termite pinholes tend to appear on interior drywall walls and ceilings, particularly in areas close to the ground or near moisture sources. Bathrooms, kitchens, and basement-level walls are frequent locations. Because subterranean termites need soil contact and moisture to survive, their damage often starts at the lowest points of a structure and works upward. If you’re seeing mud-patched holes on upper floors, the infestation may be extensive.
What to Do When You Find Them
Finding termite holes means the colony has been active long enough to produce visible evidence, which in most cases means weeks to months of feeding has already occurred. A few practical steps can help you assess the scope of the problem before professional treatment begins.
First, look for patterns. A single pinhole could be minor, but multiple holes along a wall, combined with mud spots, sunken drywall trails, or frass piles, suggests a larger infestation. Check along baseboards, around window and door frames, and in any area where wood contacts or sits close to soil. Use a flashlight to inspect crawl spaces and foundation walls for mud tubes, which are pencil-width tunnels made of soil and saliva that subterranean termites build to travel between the ground and your home.
Moisture is a major attractant. Leaking pipes, poor drainage around the foundation, and condensation in crawl spaces all create conditions termites prefer. Fixing moisture problems won’t eliminate an active colony, but it removes one of the conditions that drew them in and helps prevent reinfestation after treatment. Gaps or cracks in your foundation also serve as entry points and should be sealed.
A professional termite inspection typically covers both the interior and exterior of the home. Inspectors look for mud tubes, wood damage, live termites, and moisture readings in wooden structures using specialized meters. The inspection report will detail what was found, how severe the damage is, and what treatment options make sense for the species involved.
Repairing Damage After Treatment
Patching termite holes only makes sense after the infestation has been fully treated. Filling holes while termites are still active just hides the evidence without solving the problem.
If the damage is limited to drywall, the affected sections can be cut out and replaced. This is relatively straightforward, but it comes with an important caveat: if termites damaged the drywall surface, they may also have damaged the wooden studs or ceiling joists behind it. These structural components are harder and more expensive to repair, so it’s worth having a contractor check what’s behind the wall before you patch it up. Small holes in solid wood can be filled with wood putty or epoxy filler once you’re confident the colony is gone, but any wood that feels hollow, crumbles easily, or shows extensive internal tunneling may need to be replaced entirely for structural safety.