Rodent & Pest Control

Pest Control in Houston, TX

What drives Houston's pest problems - termites, mosquitoes, roaches, fire ants - when they peak, and how to decide between DIY and a pro.

Reviewed 2026-07-20.

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Pests that drive problems in Houston

  • Termites (native and Formosan subterranean). The first U.S. Formosan subterranean termite infestation was found in 1956 near the Houston Ship Channel in Pasadena, Harris County. Formosan colonies grow at least four times as large as native subterranean colonies, feed faster, and can build aerial nests inside walls where moisture is available. [source]
  • Mosquitoes. Harris County Public Health and the Houston Health Department confirmed active human West Nile virus cases in the Houston area in 2026, and report that summer has historically been the peak season for West Nile transmission in Harris County. [source]
  • Cockroaches (German, American, smokybrown). The smokybrown cockroach, one of the four most common Texas species, is common outdoors especially in the more humid areas of Texas, favoring mulch, ground cover, and tree holes. German cockroaches do not live outdoors in Texas and develop fastest around an 80 degree Fahrenheit indoor optimum. [source]
  • Red imported fire ants. Fire ants are a distinct flood hazard in this flood-prone metro. Flooding causes colonies to leave their mounds and float until they can reach land, so floating rafts often wash up against homes after high water. [source]
  • Roof rats. A secondary but real driver, roof rats are common urban pests in East Texas and the South, and can enter through a gap under a door as narrow as 1/2 inch or a hole the size of a quarter, a low bar for many older Houston-area homes. [source]

When pests peak here

Formosan subterranean termites swarm at night from early May through June, while native subterranean termites swarm during the day. Fire ant mating flights are most common in spring and fall, and baiting works best when soil surface temperatures sit between 70 and 90 degrees Fahrenheit, which for most of Texas falls between May and September. Summer has historically been the peak season for West Nile virus transmission in Harris County. Cockroaches stay active indoors year-round but grow faster in warm weather.

Local factors

  • Coastal humidity. The major termite populations in Texas sit in the state's coastal areas, and the smokybrown cockroach is common outdoors especially in the more humid parts of Texas. Gulf Coast humidity is a structural driver of pest pressure across the metro, not just a comfort issue. [source]
  • Flooding. Hurricane Harvey in 2017 brought catastrophic flooding to nearly every one of the 22 watersheds in Harris County, with an estimated 136,000 structures flooded. Flooding matters for pest control because it creates the standing water mosquitoes need to breed and forces fire ant colonies to float until they reach land. [source]
  • New construction versus older homes. Texas A&M AgriLife notes that the only full termite treatment is a pre-construction soil termiticide applied before the slab is poured; post-construction work is considered partial by comparison. That distinction matters across the metro's fast-growing new-build suburbs and its older inner-Houston neighborhoods. [source]
  • Texas licensing. Structural pest control, including termite work, is regulated by the Texas Department of Agriculture's Structural Pest Control Service, which licenses applicators across three license types and requires notification before pre-construction termite treatments and fumigations. Texas law also requires a signed Wood Destroying Insect report for any official termite inspection. [source]

Metro Houston sits on the humid Gulf Coast, and its pest pressure follows the heat and the water. Termites are the headline structural pest - the first U.S. Formosan subterranean termite infestation was found near the Houston Ship Channel in 1956, and Formosan colonies grow far larger and feed faster than native ones. Mosquitoes track the region’s standing water and summer heat, with West Nile virus a recurring summer concern in Harris County, while smokybrown cockroaches and red imported fire ants both thrive in the coastal humidity. Roof rats round out the list as a secondary nuisance.

If you want it handled, comparing licensed local quotes is the fastest route - Texas structural pest control is regulated by the state Department of Agriculture. If you would rather do it yourself, removing standing water, sealing entry points, and timing fire ant baits to warm-season soil temperatures do the most work here.

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