Pest pressure in New Braunfels doesn't follow a generic national calendar — Central Texas' warm soil, limestone terrain, and river-adjacent humidity shift the timing of what shows up and when. A pest control checklist written for the Midwest or the Northeast simply doesn't map onto a Comal County backyard, where soil temperatures rarely drop far enough, for long enough, to fully knock back fire ant colonies or send termite activity into true dormancy. Here's what actually tends to happen, season by season, based on what our technicians see on real properties across New Braunfels, Gruene, and the surrounding Hill Country communities.
Spring (March–May)
Spring rain is the trigger for subterranean termite swarms — the winged reproductive termites that emerge after a warm rain to start new colonies. In a typical year, the first significant swarm activity in Comal County shows up within a day or two of a heavy spring storm, often in the evening as temperatures climb back up after the rain clears. This is also when ant colonies that slowed down over winter ramp back up, particularly along disturbed soil near new landscaping or construction.
If you're going to schedule a termite inspection proactively, this is the season to do it, before swarmers turn into an established colony that can go undetected for years in a crawl space or slab foundation. Older homes near the historic Gruene district and older Seguin neighborhoods tend to see this risk most acutely, given decades-old construction that predates current moisture-barrier standards.
Summer (June–August)
This is peak season for three things at once: mosquitoes (especially near the Comal and Guadalupe Rivers and any property with standing water, a common issue on Canyon Lake shoreline lots), wasp and hornet nest-building under eaves and in attic vents, and fire ant activity, which stays aggressive as long as soil temperatures hold above the mid-50s — nearly guaranteed through a New Braunfels summer that regularly pushes into the upper 90s and low 100s.
Scorpions also become more active at night during this stretch, particularly in homes closer to the limestone-heavy terrain on the northern and western edges of town, and in more rural properties toward Spring Branch and Bulverde along the TX-46 corridor. This is also when we field the most calls about visible fire ant mounds appearing in yards within a day or two of a summer thunderstorm.
Fall (September–November)
As nights start cooling, rodents begin looking for shelter — this is when roof rat and mouse activity in attics and garages tends to pick up noticeably, especially in homes with mature tree cover near the Guadalupe River corridor where roof rats can travel along branches directly onto a roofline. Spiders also move indoors more often during this period as outdoor insect prey becomes scarcer, and German cockroach activity in kitchens can shift as households run air conditioning less and open windows more.
Fall is also a practical window for exterior exclusion work — sealing the gaps around utility lines, vents, and foundation cracks that rodents and spiders will otherwise use once the weather turns.
Winter (December–February)
Rodent intrusion peaks here as mice and rats actively seek warmth indoors, often entering through the same gaps identified during a fall inspection if they weren't sealed in time. Above-ground termite activity slows during the coldest stretches, but this doesn't mean the colony is gone — subterranean termites simply retreat deeper into the soil, which is exactly why bait station monitoring still matters through the winter months even without visible swarmers.
The Practical Takeaway
A single one-time treatment reacts to whatever's active right now, which works fine for an isolated, already-identified problem. A quarterly plan is built around this actual seasonal rhythm — termite inspection timed to spring, mosquito and fire ant treatment scheduled ahead of summer, exclusion work done in fall before rodents move in for winter — which is why most Comal County homes are better served by one than the other.