Knollwood is a small city in Grayson County, Texas, located just north of Sherman along U.S. Highway 75. The city is primarily residential and is situated near the western edge of the Red River Valley, offering convenient access to both Sherman and nearby recreational areas like Lake Texoma. Knollwood was incorporated in 1972 and is known for its quiet neighborhoods and proximity to regional employers in Sherman. From Lake Texoma to Post Oak Creek, Romex treats Grayson County properties with proven local expertise and same-day response.
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Romex joined the Rollins, Inc. family in 2026, but Romex continues to operate independently—same local Knollwood management, same technicians, same culture. Rollins acquires brands and lets them run with their established operations. What you get: the same locally managed Romex service, now backed by world-class training and resources. We also offer all-natural pest control options upon request—just ask your technician.
Population: ~432 · Grayson County
Knollwood is a small city in Grayson County, Texas, located just north of Sherman along U.S. Highway 75. The city is primarily residential and is situated near the western edge of the Red River Valley, offering convenient access to both Sherman and nearby recreational areas like Lake Texoma. Knollwood was incorporated in 1972 and is known for its quiet neighborhoods and proximity to regional employers in Sherman.
Knollwood sits on gently rolling terrain with clay and loam soils characteristic of the Blackland Prairie region of North Texas. The city is at an elevation of approximately 750 feet, with drainage influenced by nearby tributaries of Post Oak Creek. Its proximity to the Red River and Lake Texoma supports a variety of native vegetation and creates habitats that can harbor both urban and rural pests.
Primary residential area with single-family homes and mature trees.
Mosquitoes from nearby creeks and occasional rodent activity due to adjacent open fields.
Northern edge of the city bordering rural land and open lots.
Increased wildlife intrusion, including raccoons and opossums, especially in spring.
Area closest to U.S. Highway 75 and commercial activity.
Ant infestations and periodic issues with cockroaches due to higher traffic and nearby businesses.
What our licensed technicians see on the ground in Grayson County.
Termite pressure in Knollwood reflects the region's humid subtropical climate and long warm season. Homes built on concrete slabs — particularly in neighborhoods like Knollwood Heights — provide subterranean colonies hidden access through plumbing penetrations and expansion joints. Mature tree canopies near Lake Texoma contribute to elevated soil moisture that accelerates colony growth. Romex certified applicators conduct annual monitoring with non-invasive bait stations and thermal imaging, catching active tubes before structural damage reaches the sills or sub-floor. Warranty-backed liquid treatments from Termidor or Taurus SC seal the perimeter for up to ten years.
Prevention tip: Keep mulch, firewood, and landscaping timbers at least 12 inches away from foundation walls and never stack firewood against the house.
Mosquito populations in Knollwood surge from April through October, driven by heavy spring rainfall and standing water that collects in gutters, bird baths, bromeliad pockets, and drainage ditches. North Knollwood sees particularly high pressure because increased wildlife intrusion, including raccoons and opossums, especially in spring.. Our service crews have documented heavy activity within 500 feet of Post Oak Creek, where untreated vegetation provides daytime harborage for Aedes albopictus and Culex quinquefasciatus. We apply In2Care stations and barrier treatments with Talstar P that last up to 30 days per application.
Prevention tip: Walk your property weekly and dump any standing water — a discarded bottle cap can breed 300 mosquitoes in seven days.
Ant diversity is high in Knollwood: we routinely identify fire ants, sugar ants (odorous house ants), rover ants, acrobat ants, and carpenter ants on a single property. Knollwood Heights is a textbook case — mosquitoes from nearby creeks and occasional rodent activity due to adjacent open fields. Near Lake Texoma, crazy ants have been documented on a few properties, requiring specialized bait protocols. Romex applicators never recommend over-the-counter aerosols for trails because they scatter satellite colonies and make the problem worse.
Prevention tip: Seal gaps around exterior pipe penetrations and weather-stripping; most indoor ant trails originate at these entry points.
Oriental cockroaches ("black beetles") thrive in the cool, damp spaces under Grayson County homes — crawl spaces, storm drains, and garage corners. Knollwood Heights homeowners call about them most often in early fall, when roaches seek warmer harborage. Our inspection covers the foundation perimeter for harborage (leaf litter, mulch depth, downspout splash zones) before any product goes down. We follow up with crack-and-crevice Premise 0.05 applications in areas of high moisture.
Prevention tip: Inspect any secondhand appliance (especially microwaves, toaster ovens, mini fridges) before bringing it indoors — German cockroaches hitchhike inside.
Our technicians understand Knollwood's unique Blackland Prairie clay soils and how they affect pest movement and treatment effectiveness.
We target breeding sites along Knollwood's drainage creeks with specialized larvicide treatments to break mosquito life cycles.
Expert raccoon and opossum exclusion services for homes near Knollwood's open fields, especially during active spring intrusion season.
Quick service to all Knollwood neighborhoods including Knollwood Heights with our nearby DFW regional technicians.
All Romex technicians are licensed by the Texas Department of Agriculture (TDA) and follow state guidelines for pesticide application. Some Knollwood neighborhoods may have HOA landscaping requirements that affect pest control placement.
Knollwood experiences a humid subtropical climate, with average summer highs near 94°F and winter lows around 33°F. Annual rainfall averages close to 40 inches, with high humidity in spring and summer months. This climate favors the proliferation of mosquitoes, ants, and termites, especially after heavy rains.
Knollwood's proximity to Post Oak Creek and the wooded areas of the Red River Valley contribute to persistent mosquito and tick populations. Rich loam and clay soils are conducive to termite colonies, while the mix of urban and open land supports rodents and occasional wildlife pests. The city's tree cover and nearby water sources increase pest habitats, especially during wet seasons.
Spring rains and warming temperatures promote termite swarms and a surge in mosquito breeding along Post Oak Creek. Ant activity also increases in residential yards.
High heat and humidity drive peak mosquito populations, especially near water. Wasps and ants become more aggressive, and spider sightings increase in shaded areas.
Cooler nights push rodents indoors, while spiders and ants remain active as they seek shelter. Pest pressure shifts from outdoors to inside homes.
Rodents look for warmth in garages and attics, and cockroaches may invade homes from surrounding fields and businesses near the highway.
Pro Tip: Knollwood homeowners save up to 40% with year-round protection plans that proactively treat for seasonal pests before they become infestations.
Due to its location near Post Oak Creek, Knollwood has historically seen occasional increases in mosquito-borne illnesses, prompting community-wide pest control efforts after major rain events.
TDA-licensed professionals serving Grayson County since 2016. Full liability and workers' compensation coverage.
Professional pest control tailored to Knollwood's local conditions. Targeted treatments that minimize chemical use while maximizing effectiveness. We also guide homeowners on IPM strategies they can implement between visits.
Certified specialists in Sentricon® Always Active™ termite baiting. Essential protection for Grayson County properties.
Straightforward answers to the most common pest control questions from Knollwood homeowners — from pricing and service schedules to local pest pressures.
Real pest treatment data from our Knollwood service records — not estimates.Updated May 2026
Quarterly & preventive treatments for common household pests
Targeted treatments requiring specialized protocols & equipment
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Verified reviews from Knollwood and surrounding areas
Reviews are from Google Business Profile and updated weekly
See all reviews on GoogleRomex technicians route through Knollwood daily. The map below shows the city and surrounding area we serve.
Spring activity — schedule preventive treatment now.
“Romex solved our terrible mosquito problem near the creek in North Knollwood. Haven't had issues since their seasonal treatments started!”
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