Texas homes host a wide range of insects and arachnids year-round, thanks to the state’s long summers, mild winters, and humid storm seasons. Cockroaches, fire ants, termites, spiders, scorpions, and silverfish are among the most frequent uninvited guests. Some are harmless nuisances, while others can damage your home’s structure or pose genuine health risks. Here’s what you’re likely dealing with and what to do about it.
Cockroaches
The German cockroach is the most common species found inside Texas residences. Adults are small, roughly two-thirds of an inch long, light brown with two dark stripes behind the head. They prefer kitchens and bathrooms where food, moisture, and warmth are easy to find. German cockroaches reproduce fast, going from egg to adult in as little as 55 days, and they’re easily transported between apartments in bags, boxes, or appliances. If you see them during the day, the infestation is likely already heavy, since cockroaches are nocturnal and prefer tight, hidden spaces.
The American cockroach is the large, reddish-brown roach (about an inch and a half long) that often startles people in garages and basements. These typically live outdoors under leaf litter, stones, and debris, then move inside through foundation cracks during summer heat or heavy rain. A third species, the brown-banded cockroach, is roughly the same size as the German cockroach but lighter in color with faint V-shaped bands on its wings. Females glue their egg cases to ceilings, behind drawers, and inside furniture, which means this species hitchhikes easily when you move or buy secondhand items.
Indoor cockroach sightings peak in late summer, particularly August, when drought pushes them toward moisture indoors. German cockroaches remain active inside homes through winter since they depend entirely on indoor conditions.
Termites
Texas termite season starts earlier than most of the country. Subterranean termites can begin swarming as early as February, with peak activity running through May. Swarmers typically emerge on warm, humid days after rain.
The native Eastern subterranean termite is widespread, but the Formosan subterranean termite is a more aggressive threat. Formosan colonies are larger and consume wood faster. They feed on both spring and summer growth wood and have been known to chew through non-cellulose materials like thin sheets of soft metal, plaster, rubber, and plastic while searching for food and moisture. Formosan termites also build aerial nests inside walls and structures, made of chewed wood, soil, saliva, and fecal material. These nests can grow to several cubic feet.
Formosan termites arrived in Texas through wooden shoring timbers at the Houston Ship Channel. They continue to spread when homeowners use recycled railroad ties or dock timbers for landscaping projects. Creosote treatment on those timbers often doesn’t penetrate to the core, offering no real protection. If you spot mud tubes along your foundation, hollow-sounding wood, or piles of small wings near windows, a professional inspection is worth scheduling promptly. Termite damage looks similar between species (soil deposits inside damaged wood), so identification of the colony type matters for treatment.
Spiders Worth Knowing
Two medically significant spiders live throughout Texas. The brown recluse is golden brown with a distinctive dark fiddle-shaped marking on its head. True to its name, it hides in undisturbed areas: basements, garages, between stacked boxes, and inside old towels or clothes. Bites deliver venom with tissue-destroying enzymes that can cause a characteristic red, white, and blue lesion at the bite site, along with fever, chills, and weakness. Some bites produce no symptoms at all.
The black widow is jet black with a red or yellowish hourglass on the underside of its round abdomen. It favors woodpiles, meter boxes, outdoor toilets, spaces under eaves, and other sheltered spots that rarely get disturbed. Black widow venom is a neurotoxin, and while only a tiny amount is injected per bite, it can cause intense abdominal cramping, profuse sweating, tremors, and nausea. Children and older adults face the highest risk of severe reactions.
Both species are most active indoors during July and August, when extreme heat drives them toward cooler, moister areas of your home. Reducing clutter in garages and storage areas is the single most effective way to limit encounters.
Scorpions
Scorpions enter Texas garages and homes primarily in summer as outdoor conditions dry out. Activity picks up in June, peaks around August, and tapers off as temperatures cool in fall. They follow the moisture line, gravitating toward irrigated yards, cool concrete slabs, and the dark gaps around garage doors. Most Texas scorpion stings are painful but not dangerous for healthy adults, producing localized burning and swelling similar to a wasp sting.
Fire Ants
Fire ants are effectively a year-round pest in Texas. Colonies stay active whenever soil temperatures allow, with mound-building peaking in spring and again in fall. Even in January, mounds reappear during warm spells. They rarely infest interior living spaces the way cockroaches do, but they colonize yards, garden beds, and the edges of foundations. Their stings produce painful, fluid-filled pustules and can trigger serious allergic reactions in some people.
Kissing Bugs and Chagas Disease
Kissing bugs (triatomines) are a less familiar but genuinely concerning pest. Texas has more species and more documented findings than almost any other state. Adults are half an inch to an inch long, dark brown or black, often with orange or red striping along the edges of their bodies. About half of the kissing bugs tested in research carry the parasite that causes Chagas disease.
The parasite lives in the bug’s feces, not its saliva. Transmission happens when a person scratches infected feces into the bite wound, or touches their mouth or eyes with contaminated hands. Dogs can become infected by eating the bugs. Chagas disease can cause serious heart problems over time, so if you find a kissing bug in your home, avoid crushing it with bare hands. Capture it in a container if possible for identification.
Other Common Indoor Pests
Silverfish thrive in humid Texas bathrooms, laundry rooms, and attics. They feed on paper, glue, and starchy materials and can damage books, wallpaper, and stored documents. Earwigs seek out moist, dark crevices and often come inside through gaps around doors after rain. Fleas and ticks climb in activity starting in May and remain a problem through fall, particularly in homes with pets. Springtails, tiny jumping insects attracted to moisture, sometimes appear in large numbers around bathrooms and potted plants but are completely harmless.
When Pests Are Most Active
Texas pest pressure barely has an off-season. Mosquitoes are active from roughly March through November, one of the longest seasons in the country, with populations spiking about a week after each major storm. Termites swarm February through May. Summer brings peak activity for cockroaches, scorpions, and spiders. Fall storms trigger a second fire ant peak and restart mosquito breeding. Winter is the quietest period, but rodents move into attics and garages as nights cool in October and November, and German cockroaches hold steady indoors regardless of the calendar.
Keeping Bugs Out of Your Home
Most pests enter through gaps you can find and fix in a weekend. Start with your exterior doors. If you can see daylight under any door, the seal is gone. A replacement door sweep costs under $15 and installs with a screwdriver. Check the door between your garage and living space first, since garages are the most common staging area for scorpions and rodents.
Walk the outside of your home and look for spots where window and door frames have separated from the siding or brick. Texas heat causes caulk to shrink and crack within a few years. A tube of exterior silicone caulk and a caulk gun run about $8 total. Focus on first-floor windows and any frame with visible separation. Every pipe, cable, and wire that enters your home is a potential pest highway, so fill those gaps with caulk or expanding foam. For rodent-prone areas, stuff steel wool into the gap before sealing, since mice can’t chew through it.
Brick homes across Texas have weep holes, small gaps in the mortar near the foundation designed to let moisture escape. They also let scorpions, spiders, roaches, and even snakes inside. Professional weep hole screens block pests while preserving the drainage function, but improper screening can trap moisture and cause structural issues, so this one is better left to a pro. The same goes for slab cracks and expansion joint separations, which are common in North Texas clay soils where homes shift seasonally.
What Professional Pest Control Costs
The average Texas homeowner spends $300 to $800 per year on professional pest control. Most services start with an inspection costing $75 to $150, followed by an initial treatment of $150 to $400 depending on your home’s size and the severity of the problem. Quarterly service plans are the most common choice for residential homes, running $80 to $150 per visit, or roughly $320 to $600 annually. Monthly service, at $60 to $120 per visit, is typically reserved for severe infestations or high-risk properties. Rural homes with minimal pest pressure can sometimes get by with twice-a-year treatments at $120 to $200 each.