Termites are among the most structurally damaging insects in North America, collectively causing an estimated $5 billion in property damage annually in the United States. While Montana's cold climate historically limited termite activity compared to southern states, subterranean termites (Reticulitermes spp.) — the most destructive species, are present and active in the state, particularly in western Montana including the Missoula area.
Subterranean termites live in underground colonies and travel to above-ground food sources through mud tubes, pencil-thin tunnels of soil and wood that protect them from open air. They consume cellulose in wood, and unlike carpenter ants, they consume the wood itself, hollowing out structural members from the inside while the exterior surface may appear completely normal. A mature subterranean termite colony can contain hundreds of thousands to over a million workers, consuming up to a pound of wood per day.
The danger of termites lies in their invisibility. Infestations can persist for years, causing significant structural damage to floor joists, wall studs, support beams, and subflooring, before any visible signs appear. By the time a homeowner notices a problem, costly structural repairs are often already necessary.
Size
Workers: ⅛ inch; Swarmers: up to ½ inch with wings
Color
Creamy white (workers); dark brown/black (swarmers)
Active Season
Year-round underground; swarmers visible April–June
Risk Level
Very High (severe structural damage)
Habitat
Soil colonies; wood in contact with or near the ground
Feeding
100,000–1,000,000+
SIGNS OF INFESTATION
Warning Signs of Termite Activity
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Mud tubes — Pencil-width tubes of mud running along foundation walls, joists, and concrete piers are the most reliable sign of subterranean termite activity.
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Swarmer termites or discarded wings — Winged termites (swarmers) emerging in spring to start new colonies, or piles of shed wings near windows and light sources.
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Hollow-sounding wood — Wood that sounds hollow when tapped, or that gives way when pressed, may have been consumed from within.
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Damaged wood with soil in galleries — Unlike carpenter ant galleries (clean and smooth), termite-damaged wood contains soil and mud packed inside the galleries.
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Bubbling or uneven paint — Paint that bubbles, blisters, or appears water-damaged without a water source can indicate termite activity beneath the surface.
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Tight-fitting doors and windows — Termite damage and moisture from their activity can cause wood to warp, making doors and windows difficult to open.
HEALTH RISKS
Termites do not bite humans or transmit disease. The health risk associated with termites is indirect: structural damage that makes a building unsafe, and the mold growth that often accompanies the moisture termites introduce into wood.
PROPERTY DAMAGE
Termite damage is among the most expensive and serious property damage a homeowner can face. Subterranean termites can consume the structural integrity of floor systems, support walls, and foundation framing over a period of years. In severe cases, structures can become unsafe. Most homeowner's insurance policies do not cover termite damage — making prevention and early detection critically important. A professional termite inspection before purchasing a property is strongly recommended.
