Catching termites early is the difference between a manageable treatment and a major repair bill. In Arizona, subterranean termites are particularly destructive because they work inside wood rather than on the surface, making them difficult to detect until significant damage has already occurred. Knowing what the early warning signs look like gives you a real advantage.

Mud tubes are the most reliable early indicator of subterranean termite activity. These pencil-thin tunnels of soil and wood particles appear on foundation walls, interior walls, and structural members. Termites build them to travel between soil and wood while maintaining the humidity they need to survive. Finding a mud tube — even a small one — warrants an immediate professional inspection.

Swarmer activity is another early signal, though it often indicates a colony that's already been established for several years. Swarmers appear in spring, typically in March through May in Arizona, and are often mistaken for flying ants. Finding shed wings near windowsills or entry points is a reliable indicator that swarmers have been present.

Hollow-sounding wood is a tell-tale sign of termite damage inside structural members. Tap on baseboards, door frames, and trim — wood that sounds papery or hollow has likely been consumed from the inside. Press a screwdriver against suspicious areas; wood that collapses easily has been compromised.

Stuck doors and windows that suddenly become difficult to operate can indicate termite damage in the surrounding framing. As termites consume wood, moisture changes in the damaged material can cause warping that affects how doors and windows operate. This symptom is often initially attributed to settling or humidity when termites are the actual cause.

Frass — the pellet-like droppings of drywood termites — appears in small piles near infested wood. Unlike subterranean termites, drywood termites live inside the wood rather than in soil, and they push their droppings out through small holes in the surface. Frass piles look like sawdust or coffee grounds and are a reliable indicator of active drywood termite activity.

Annual professional inspections are the most reliable way to catch termites before they cause significant damage. An experienced termite inspector knows where to look — in crawl spaces, attic framing, garage perimeters, and other areas homeowners rarely examine. In Arizona's high-pressure termite environment, yearly inspections are not optional for homeowners who want to protect their investment.