Most people assume mosquito season starts sometime around Memorial Day and ends when school starts back up. In Texas, that assumption will get you bitten — repeatedly, and starting much earlier than you expect.
Texas has one of the longest mosquito seasons in the country. In much of the state, mosquitoes become active as early as February and stay active through November. In some areas of Central Texas, they never fully disappear. If you live in New Braunfels, Seguin, or San Marcos, understanding the actual mosquito season timeline is the first step toward protecting your family and your yard all year long.
The Texas Mosquito Season Timeline
Mosquitoes do not follow a calendar. They follow temperature. Once the weather consistently stays above 50 degrees Fahrenheit, mosquitoes wake up and begin feeding and breeding. In most of Texas, that threshold arrives well before spring officially begins.
Here is what a typical Texas mosquito year looks like:
February through May: Mosquito activity begins quietly. Populations are small, but they are building. This is the window when proactive homeowners get ahead of the season. Early barrier treatments applied in March or April can significantly suppress populations before they peak.
June through September: This is peak season. Warm temperatures, regular afternoon rain, and high humidity create the perfect conditions for mosquito populations to explode. Biting pressure is highest in the early morning and around dusk, but some species will bite throughout the day, particularly on overcast or humid days.
October and November: Activity begins to slow as temperatures drop, but mosquitoes remain active during warm stretches. A late-season rainstorm in October can temporarily spike populations again.
December through January: Mosquito activity is minimal but not zero in Central Texas. Mild winters have extended the active season in recent years.
The key takeaway is that peak mosquito season in Texas runs roughly five months — from June through September — with shoulders on either side that many homeowners ignore entirely.
Why Central Texas Has It Worse
Not all parts of Texas experience mosquito pressure equally. Central Texas — the region that includes New Braunfels, Seguin, San Marcos, Kyle, and Buda — sits in a particularly active zone for several reasons.
The Guadalupe River and the Comal River run through the heart of Comal County. These waterways, along with their banks, flood zones, and adjacent vegetation, provide year-round moisture and shade for adult mosquitoes and consistent breeding habitat along the water’s edge.
The area’s topography also plays a role. New Braunfels has more natural low-lying areas, drainage corridors, and creek beds than many similarly sized Central Texas cities. After any significant rain event, water pools in these areas and creates productive breeding grounds within a short distance of residential neighborhoods.
Add to that the humidity that rolls in from the Gulf and the warm winters that have become more common in recent years, and you have conditions that allow mosquito populations to build earlier, peak harder, and stay active longer than most homeowners expect.
How Weather Directly Affects Mosquito Populations
The single most important weather factor for mosquito populations is rain. When it rains, water collects in every container, depression, and low spot on your property. Female mosquitoes lay eggs at the water’s edge or directly on the water’s surface, and those eggs hatch within days.
The surge in mosquito biting you feel after a rain event typically arrives 7 to 10 days later — the time it takes for larvae to develop into adults. This is why mosquito pressure often feels worst in the week or two following a storm, not immediately after it.
Drought conditions reduce mosquito populations by limiting breeding sites, but they do not eliminate them. Mosquitoes will find whatever moisture remains — air conditioning condensate drains, irrigation pooling, water features, and even the small amounts of water that collect under potted plants.
In 2026, early and more frequent rainfall across Central Texas has accelerated the season. Combined with the confirmed West Nile virus case already on record in Texas, this year warrants more attention than most. If you want to understand the West Nile risk specific to New Braunfels, we covered it in detail in a separate post.
When Should You Start Mosquito Treatments?
The biggest mistake most homeowners make is waiting until they are already being bitten before doing something about it. By the time mosquitoes are unbearable in your backyard, you are already behind.
The best time to start a mosquito treatment program is before peak season — ideally in March or April. An early barrier spray treatment suppresses the first generation of adults and disrupts the breeding cycle before populations reach their summer highs.
That said, it is never too late to start. A professional mosquito yard spray service applied in June or July will still deliver significant results within a few days. The goal then becomes maintaining that protection with regularly scheduled retreatments every 21 to 30 days through September.
Here are the moments that typically signal it is time to call a professional:
- You have had standing water on your property that you cannot fully drain
- Your yard is adjacent to a creek, drainage ditch, or natural water source
- Previous DIY products have not made a noticeable difference
- You are planning an outdoor event and need guaranteed protection
- You have children or pets who spend significant time in the backyard
Start Your Season Right
Mosquito protection works best when it starts early. Whether you are looking for a one-time treatment before a backyard event or a full-season program that keeps your yard protected all the way through fall, Camo Pest Control has options for properties throughout New Braunfels, Seguin, San Marcos, and surrounding Comal County.
Call today for pest control in New Braunfels to schedule your first mosquito yard treatment, or read about how to prepare your yard before your first service.
