Common House Bugs in Texas: The Ones Worth Knowing
The most common house bugs in Texas are American, German, smokybrown and oriental cockroaches, red imported fire ants, subterranean termites (with Formosan termites in at least 30 counties), striped bark scorpions, brown recluse and black widow spiders, and black field crickets that pour in during late summer. Texas A&M AgriLife Extension names those four cockroaches as the state’s most common, and the striped bark scorpion as the only scorpion found statewide. Most of these pests come in from outdoors and respond to sealing and better lighting choices. German cockroaches, termites and brown recluse infestations usually need a licensed professional.
Texas is big enough to have several pest climates at once: Gulf Coast humidity, the Hill Country, the Panhandle and the Chihuahuan Desert. This guide covers the house bugs that turn up statewide, flags the regional ones, and uses Texas A&M AgriLife Extension fact sheets for sizes and timing, plus our own count of what Texans photograph.
Texas house bugs at a glance
| Bug | Size | Where you usually see it | When | DIY or professional |
|---|---|---|---|---|
| American cockroach | 1.5 to 2 in | Drains, bathrooms, garages, commercial buildings | Year round | DIY sealing and bait |
| German cockroach | 0.5 to 0.6 in | Kitchen and bathroom cracks | Year round, indoors only | Professional in most homes |
| Red imported fire ant | 2.4 to 6 mm | Lawn mounds, slab edges | Mating flights spring to fall | DIY Two-Step Method |
| Tawny crazy ant | About 1/8 in | Millions in yards, foraging indoors, in electrical boxes | Houston area since 2002, spreading | Professional |
| Native subterranean termite | About 3/8 in swarmers | Swarms by day indoors near windows | January and February in south Texas, April or May in the Panhandle | Professional |
| Formosan subterranean termite | 12 to 15 mm swarmers | Swarms at night around lights | Early May through June | Professional |
| Striped bark scorpion | About 2.5 in | Attics, walls, debris, living areas in hot weather | Active at night | DIY exclusion; pro for heavy pressure |
| Brown recluse | Quarter to half-dollar leg span | Closets, garages, attics, stored boxes | Adults most seen in spring | Professional |
| Black field cricket | Winged black adults | Walls and doorways under bright lights | Highest in August and September | DIY lighting and sealing |
| Kissing bug | 0.5 to 1 in | Near pet beds and animal nests, at lights | At night | Pro, plus specimen testing |
Cockroaches: four species do most of the damage
Texas A&M AgriLife’s cockroach guide (ENTO-037) names the American, German, oriental and smokybrown cockroaches as the most common in Texas. The split that matters for control is where they live.
- American cockroach. The largest cockroach in Texas at 1.5 to 2 inches, also called the waterbug or palmetto bug. It is one of the most common cockroaches in sewer systems and is more common in commercial buildings.
- Smokybrown cockroach. Adults reach 1.25 to 1.5 inches. Lives mostly outdoors, especially in the more humid parts of Texas, in ground cover, mulch, palm fronds, soffits, attic eaves and tree holes.
- Oriental cockroach. Dark brown to black, about 1.25 inches, with short wings. Like the American, it often enters through floor drains.
- German cockroach. Half to five-eighths of an inch, light brown with two dark stripes behind the head. Texas A&M is blunt that German cockroaches do not live outdoors in Texas, and that they can produce a generation in about 100 days.
In West Texas, add the Turkestan cockroach, which AgriLife says has become one of the most common outdoor cockroaches in El Paso. The three large outdoor species usually come in through poorly sealed doors, soffits or floor drains, so sealing and drain covers do most of the work. German cockroaches are the opposite case: they spend about 75 per cent of their lives in cracks 1/32 to 3/16 inch wide, and AgriLife notes sprays are not nearly as effective as baits against them. An established kitchen infestation is usually a job for a professional. Our cockroach identification guide shows how to tell the species apart.
Ants: fire ants and the Gulf Coast crazy ant
Red imported fire ants
Fire ants are the outdoor ant most Texans deal with first. Texas A&M’s answer for typical yards is the Two-Step Method: broadcast a fire ant bait over the whole lawn so foragers carry it to every colony, hidden ones included, then treat only the mounds next to the foundation, in high-traffic areas or other sensitive spots where you want fast control. AgriLife warns never to use gasoline or other petroleum products on mounds. Our fire ant quarantine guide covers the federal quarantine and why mound-by-mound treatment alone tends to fail.
Tawny (Rasberry) crazy ants
The tawny crazy ant was found around Houston in Harris County in 2002 and has spread largely through human help, according to Texas A&M’s Urban and Structural Entomology Program. Workers are uniformly about 1/8 inch, reddish brown, and run rapidly and erratically. The giveaway is sheer numbers: millions in the landscape, foraging indoors from outdoor nests. They have no stinger and their bite causes only minute pain, but masses of them accumulate in electrical equipment, causing short circuits. They do not build mounds, which separates them from fire ants at a glance. This is not a DIY pest; suspected infestations should go to a licensed professional, who can send samples to Texas A&M for confirmation.
Termites: two very different swarm calendars
AgriLife names the native subterranean termite and the Formosan subterranean termite as the two major termites in Texas. Telling their swarms apart is one of the most useful things a Texas homeowner can learn.
- Native subterranean termites swarm during the day, usually in the afternoon. Swarming begins in south Texas in January and February, while in the Panhandle swarms do not occur until April or May. Swarmers are about 3/8 inch long.
- Formosan termites were first found in Texas in 1956 near the Houston Ship Channel in Pasadena. AgriLife says they are now in at least 30 Texas counties and all major metropolitan areas. Swarmers are yellowish brown, 12 to 15 mm, and swarm at night from early May through June, attracted to lights.
Swarmers inside a house are a strong indication of an active infestation in that structure, in AgriLife’s words. One detail worth knowing before you sign anything: some Texas termite contracts exclude Formosan termites, so AgriLife advises identifying the exact species first. Our termite zones map shows how the building code treats termite risk across the state.
Scorpions: the striped bark scorpion is statewide
Texas has 18 scorpion species, but AgriLife fact sheet E-362 says only one, the striped bark scorpion, occurs throughout the state, and it is the only species in East Texas. Adults are about 2.5 inches, yellowish tan with two broad dark stripes down the back. They climb trees and walls, are often found in attics, and during hot weather may move into living areas to escape attic heat.
Texas A&M says stings from Texas scorpions produce only moderate reactions in most people, but anyone stung should be watched for adverse reactions, and breathing difficulty or persistent swelling needs immediate medical attention. AgriLife stresses that scorpions are difficult to control with insecticides alone, so habitat changes come first: clear debris, rocks and boards from around the foundation, prune branches off the roof, weather-strip doors and plug weep holes. Our guide to scorpion control cost explains why sealing usually beats spraying and what a treatment plan adds.
Spiders: two that matter
The Texas Department of State Health Services says Texas has two venomous spiders, the black widow and the brown recluse, and that both are found indoors and outdoors throughout the state. Neither is aggressive.
The brown recluse is light brown to greyish, with a leg span about the size of a quarter to a half-dollar, a dark violin-shaped mark on the front of the body and six eyes in pairs. AgriLife says indoors it favours cluttered closets, garages, crawl spaces and attics, and adults are seen most often in spring. Because bites can be serious, Texas A&M recommends a professional for household infestations, combined with clutter removal, sealed storage boxes and sticky cards for monitoring. Any suspected spider bite is a matter for a doctor. Our spider identification guide covers the common harmless lookalikes.
The late-summer cricket invasion
AgriLife calls cricket outbreaks one of the most predictable pest events of the year in most of Texas. Masses of black field crickets, mostly in the Gryllus assimilis complex, appear in late summer and fall, and numbers appear highest in August and September when a summer drought is broken by rain and cooler weather. Field crickets do not breed indoors, but they can stain fabrics and wall coverings, and dead crickets pile up and smell.
The fix is mostly lighting. Texas A&M calls outdoor lighting the most important single cause of severe infestations; turning lights off early, or switching to yellow bug lights or low-pressure sodium lamps, comes first, with sealed thresholds, weep holes and door sweeps second. Indoor sprays are not recommended. The heaviest flights usually last only one to two weeks. Our guide to house and camel crickets covers the crickets that do live indoors.
Our iNaturalist seasonality index for field and house crickets nationwide shows the same late-summer surge: it jumps from 52 in July to 129 in August and peaks at 227 in September.
Kissing bugs
Texas A&M’s kissing bug program says Texas, New Mexico and Arizona have the most kissing bug species and the most findings in the United States, and about half of the bugs tested carry the Chagas parasite. Adults are about half an inch to an inch long, feed on blood at night, and are drawn to lights, according to AgriLife. A single bug indoors is not necessarily cause for alarm; nymphs or several adults suggest a breeding population nearby. Our kissing bugs and Chagas guide covers identification, testing and the risk to dogs. Questions about Chagas disease belong with a doctor or the Texas Department of State Health Services.
House beetles and black bugs in Texas
When Texans search for beetles in the house, the usual culprits are pantry beetles. AgriLife’s E-486 says the most common pests in Texas home pantries are cigarette and drugstore beetles, small brown beetles about an eighth of an inch long or less that fly to windows and light fixtures. Carpet beetles are the other indoor beetle group AgriLife covers; they often start in bird nests or dead insects in light fixtures. Finding and discarding the infested food or material is the real fix.
The common black bugs are black field crickets in late summer, the dark brown to black oriental cockroach near drains, and black widows in undisturbed corners. Outdoors, Asian lady beetles are the most photographed household pest taxon in our Texas count; our Asian lady beetle guide explains why they gather on homes.
What Texans actually photograph
We counted iNaturalist research-grade records in Texas for a fixed list of household pest taxa. These are photographed, identified sightings, mostly outdoors, so they show how often each animal is noticed rather than how many homes are infested.
Asian lady beetles lead with 29,430 records, then common pill woodlice (20,366) and bark scorpions (12,892), ahead of red imported fire ants at 10,918. Scorpions run at 38.8 records per 10,000 insect records in Texas, against 16.9 in Florida. Kissing bugs (1,958 records) and brown recluse spiders (1,589) both show up far more in Texas than in our Florida count, where they have 157 and 1 respectively. The German cockroach, with 252 records, barely registers, most likely because it lives indoors and few people photograph it there.
When DIY is enough, and when to call
- Outdoor cockroaches, crickets and scorpions: sealing, weep hole plugs, door sweeps, debris clearance and lighting changes are usually enough.
- Fire ants: the Two-Step Method, following every label.
- German cockroaches, brown recluse infestations and tawny crazy ants: usually professional jobs.
- Termite swarmers, mud tubes or damaged wood: a licensed termite inspection, with the species confirmed before you sign a contract.
Follow the label on any product you use, and do not rely on foggers for any of these pests.
Frequently asked questions
What are the most common bugs in Texas homes?
Texas A&M AgriLife Extension lists the American, German, oriental and smokybrown cockroaches as the most common cockroaches in Texas. Add red imported fire ants, subterranean termites, striped bark scorpions, field crickets in late summer, and pantry beetles such as cigarette and drugstore beetles. The black widow and brown recluse are the two venomous spiders found statewide.
Are scorpions in Texas dangerous?
Texas A&M says stings from Texas scorpions produce only moderate reactions in most people, because the venom has little effect on the nervous system. Allergic reactions are possible, so a stung person should be watched. If swelling or pain persists, or breathing becomes difficult, get immediate medical attention. The striped bark scorpion is the only species found throughout Texas.
Why are there so many crickets in Texas in the fall?
Field crickets complete development in summer and make nighttime mating flights in late summer and fall. Texas A&M says numbers appear highest in August and September, especially when a summer drought is broken by rain and cooler weather. Bright outdoor lights draw the largest numbers, so turning lights off or switching to yellow bug lights is the most important control step.
When do termites swarm in Texas?
Native subterranean termites swarm during the day, starting in January and February in south Texas and in April or May in the Panhandle. Formosan termites swarm at night from early May through June and are attracted to lights. Texas A&M says swarmers inside a house strongly indicate an active infestation in that structure, which calls for a professional inspection.
What is the small brown beetle in my Texas pantry?
Most likely a cigarette beetle or drugstore beetle. Texas A&M AgriLife says these are the most common pests in Texas home pantries. Adults are small, brown and rounded, and the larvae feed in flour, spices, beans, dried fruit, pet food and similar products. Finding and throwing out the infested package, then cleaning the shelf, deals with the source.
Sources
- Texas A&M AgriLife Extension, Cockroach Biology and Management (ENTO-037), 2017.
- Texas A&M AgriLife Extension, Scorpions (E-362).
- Texas A&M AgriLife Extension, Formosan Subterranean Termites (E-367) and Subterranean Termites (E-368).
- Texas A&M AgriLife Extension, The Texas Two-Step Method for Fire Ant Control (L-5070).
- Texas A&M Urban and Structural Entomology Program, Tawny (Rasberry) Crazy Ant, Nylanderia fulva.
- Texas A&M AgriLife Extension, Insects in the City: Cricket Control in the Fall (ENT-2003), Brown Recluse Spiders (ENT-3003), Conenose Bugs (ENT-3008), Cigarette and Drugstore Beetles (ENT-2004).
- Texas A&M AgriLife Extension, Pantry and Fabric Pests in the Home (E-486).
- Texas A&M University College of Veterinary Medicine, Kissing Bugs and Chagas Disease program.
- Texas Department of State Health Services, Spiders (venomous animal information).
- UF/IFAS Featured Creatures, Red Imported Fire Ant (EDIS IN352), for worker size.
- The Pest Control Brief analysis of iNaturalist research-grade records, pulled October 2026.
