Published 2026-05-30 · Houston Pest Control
Signs You Have Termites in Houston (Before They Cause Damage)
Quick answer: In Houston's humid subtropical climate, the most reliable early signs of termites include discarded wings near windows or doors (usually after spring swarms), mud tubes running up foundation walls or piers, and hollow-sounding wood when tapped. Most Houston homeowners discover termites through these visible clues before structural damage becomes severe, though professional inspections ($85–$175) catch infestations an average of 1–2 years earlier than DIY monitoring.
Termite Swarmers and Discarded Wings
The most obvious early warning sign appears during Houston's termite swarming season, which runs from late February through May. Subterranean termites (the dominant species in Harris County) send out winged reproductives after heavy spring rains. You'll find piles of discarded wings on windowsills, near exterior doors, or around porch lights. These wings are about 3/8 inch long, translucent white or tan, and usually appear in clusters of 20 to 100.
Swarmers themselves look like flying ants but have straight antennae (not elbowed), equal-length wings, and thick waists. They're attracted to light and moisture, so check around air conditioning condensate drains, leaky outdoor faucets, and areas where sprinkler systems over-spray against your foundation. In neighborhoods like Memorial, Bellaire, and The Heights where mature landscaping holds moisture against older wood-frame homes, swarmers often emerge from soil near foundation plantings.
If you see swarmers inside your home rather than just outside, the colony is likely already established in your structure. Houston's high humidity (averaging 75% year-round) means termites can travel further from soil moisture sources than in drier climates, making interior swarms more common here than in other regions.
Mud Tubes on Foundations and Exterior Walls
Subterranean termites build pencil-width mud tubes to travel between soil and wood without drying out. In Houston, check pier-and-beam foundations (common in pre-1960s homes in Montrose, Garden Oaks, and Oak Forest), concrete slab edges, brick veneer, and any wood-to-ground contact points. Tubes are usually tan or brown, about 1/4 to 1/2 inch wide, and run vertically from soil up to wood framing.
Look closely where your foundation meets the ground, especially on north-facing walls that stay shaded and damp. Termites in Harris County also build tubes inside crawl spaces, along plumbing penetrations, and up the interior of block walls. The tubes feel brittle and break easily, but active colonies rebuild them within 24–48 hours. If you break a tube and it's reconstructed when you check again in two days, you have an active infestation.
Houston's clay soil expands and contracts with moisture changes, creating cracks in slab foundations that termites exploit. Check expansion joints, control joints, and anywhere concrete has settled or separated. Homes in areas with poor drainage (like parts of Meyerland, Westbury, and sections near Brays Bayou) see more termite pressure because consistently damp soil supports larger colonies.
Wood Damage and Hollow-Sounding Timbers
Termites consume wood from the inside out, leaving a thin veneer intact. Tap wooden baseboards, door frames, window sills, and floor joists with a screwdriver handle. Infested wood sounds hollow rather than solid. You might also notice wood that feels soft or papery when pressed, or sections that flex unusually when weight is applied.
In Houston's older housing stock (particularly 1940s–1970s homes in Sharpstown, Alief, and southeast Houston), check garage door frames, exterior trim boards, and wooden porch supports. These areas contact soil moisture or trap humidity, making them termite entry points. Blistered or bubbling paint on wood surfaces sometimes indicates termite damage underneath, though this can also result from water damage, so professional inspection is necessary to confirm.
Pier-and-beam homes require checking the subfloor from crawl spaces. Look for sagging floors, squeaky boards that suddenly appear, or visible galleries (channels termites carve) in floor joists. The high water table in parts of Houston keeps crawl spaces humid even during dry months, providing ideal conditions for sustained termite feeding.
When to Schedule a Professional Inspection
Annual termite inspections run $85–$175 in the Houston area and catch infestations 12–24 months before visible damage appears to untrained eyes. Schedule an inspection if you notice any of the signs above, if your home is more than five years past the last treatment, or if you're buying or selling property (most lenders require termite clearance letters).
Houston's year-round termite activity means there's no "off season" when colonies go dormant. Subterranean termites feed continuously in our climate, though feeding rates increase from April through October when temperatures and humidity peak. If an inspection confirms termites, treatment costs range from $1,000–$2,800+ depending on infestation severity and home size, while liquid barrier treatments for prevention alone usually fall in the $800–$1,600 range for typical single-family homes.
Even if you see no obvious signs, homes with conducive conditions (wood mulch against foundations, irrigation spray hitting siding, poor drainage, previous termite history) benefit from proactive monitoring. Many Houston pest control companies include termite inspections as part of quarterly general pest service plans ($120–$165 per quarter), making ongoing monitoring affordable compared to emergency treatment costs after extensive damage develops.
Frequently asked
What's the difference between termite swarmers and flying ants in Houston?
Termite swarmers have straight (not elbowed) antennae, two pairs of equal-length wings, and thick waists connecting their body segments. Flying ants have bent antennae, unequal wing lengths (front wings longer than back), and pinched waists. Termite swarmers also discard their wings in piles after landing, while ants keep their wings attached.
How quickly do termites cause structural damage in Houston homes?
A mature termite colony of 60,000–100,000 workers consumes about 1 pound of wood per week. In Houston's climate where colonies stay active year-round, minor damage can appear within 6–12 months of initial infestation, though significant structural compromise usually takes 3–5 years. Older homes with more accessible wood and moisture issues see faster progression.
Can I treat termites myself or do I need a professional?
DIY spot treatments rarely eliminate entire colonies because subterranean termites nest in soil (often 50–100 feet from the feeding site) rather than inside your home. Professional treatments using liquid barriers, bait systems, or fumigation cost $1,000–$2,800+ but come with warranties. Texas doesn't require licensed applicators for consumer termiticides, but improper application often pushes termites to untreated areas rather than eliminating them.
Are termites more common in certain Houston neighborhoods?
Older neighborhoods with mature trees, wooden fences, and pier-and-beam construction (Memorial, Heights, Montrose, Bellaire) see higher termite activity due to more wood-to-soil contact and aging structures. Areas with clay soil and poor drainage (parts of Meyerland, Westbury, southwest Houston) also experience more pressure because damp conditions support larger colonies. However, termites occur throughout Harris County regardless of neighborhood.
What time of year should I watch for termite signs in Houston?
Swarmers are most visible from late February through May after heavy rains, but Houston's subtropical climate keeps termite colonies active year-round. Check for mud tubes and wood damage during any season. Fall and winter inspections often find evidence overlooked during summer when homeowners focus on mosquitoes and other pests, making October through January a strategic time for proactive inspections.