Termite Swarm Season Texas 2026: Complete Regional Forecast & Homeowner Prevention Guide

When Do Termites Swarm in Texas?

Termite swarm season in Texas is not a single date — it is a moving window that varies by species, region, and weather conditions. Subterranean termites (the species responsible for 95% of Texas termite damage) typically swarm from February through May, with peak activity in March-April for South Texas and April-May for North Texas. Formosan termites — an invasive, more aggressive species established in the Houston-Galveston area — swarm from May through July, peaking in June.

The key trigger is not the calendar but the weather. Termites swarm after a warm rain when temperatures exceed 70°F and relative humidity is high. The swarm typically occurs in the late afternoon or early evening, often near lights. If you see winged insects emerging from the ground near your foundation on a warm, humid evening after rain, those are almost certainly termite swarmers — not flying ants.

2026 Regional Forecast

South Texas (Houston, San Antonio, Corpus Christi): Swarm activity began in late February and is peaking now (March-April). Formosan termites will begin swarming in May. Houston homeowners should be especially vigilant — the city has the highest Formosan termite density in the continental US.

Central Texas (Austin, Waco, College Station): Peak swarm window is March-April. The Hill Country's limestone soil does not deter subterranean termites — they build mud tubes over rock surfaces.

North Texas (DFW, Amarillo, Lubbock): Peak swarm window is April-May. Later start than South Texas due to cooler spring temperatures. Eastern subterranean termites are the dominant species.

West Texas (El Paso, Midland-Odessa): Lower risk due to arid climate, but not zero. Arid-land subterranean termites can survive on minimal moisture. Swarm activity is sporadic and typically follows rare heavy rains.

Swarmers vs Flying Ants — Quick ID

The easiest way to distinguish termite swarmers from flying ants: termites have four wings of equal length, straight antennae, and a thick waist (no constriction between thorax and abdomen). Flying ants have four wings of unequal length (front wings larger), elbowed antennae, and a pinched waist. If you find discarded wings in windowsills or near doors — all the same size — those are termite wings, shed after the swarmers pair up and begin searching for a nest site.

What to Do If You See Swarmers

1. Do not panic. Swarmers inside the house does not mean you have an active infestation — they may have entered through an open door or window. But it does mean termites are active nearby, and you should investigate.
2. Collect specimens. Catch a few swarmers in a zip-lock bag. A pest control professional can identify the species, which determines the treatment approach.
3. Check for mud tubes. Subterranean termites build mud tubes (about the width of a pencil) along foundation walls, in crawl spaces, and around plumbing penetrations. These are the highways termites use to travel from soil to wood. Break open a tube — if you see small white insects inside, you have an active infestation.
4. Call a licensed professional. Termite treatment is not a DIY project. The chemicals involved require professional application, and the treatment strategy (soil barrier, baiting system, or fumigation) depends on species and infestation extent.