- (301) 829-0060
- Mt. Airy, MD
- info@pestshieldinc.com
Pest Shield has handled mouse problems across Frederick County since 2011, and Troy Yowell personally inspects most Frederick homes before any treatment is recommended. The company holds Maryland Department of Agriculture business license MDA #30263, with Troy individually certified as a pesticide applicator under MD Cert #19058. Our team brings more than 75 years of combined pest management experience, including on-staff entomologist Jeffrey Allwine for species-level identification when field ID isn’t conclusive. Pest Shield maintains a 5.0 rating across 338+ Google and HomeAdvisor reviews and has been named Best of Frederick, MD Pest Control.
How it works
Four steps. No surprises. Same answer whether it's your first call or your tenth.
You reach Troy or someone on his team directly. No call center, no dispatcher, no routing.
Same-day or next-day for most calls. Emergency stinging-insect situations and real-estate WDI deadlines get priority.
We identify the species, locate entry points, and find the source — not just the symptom.
Written recommendation, straightforward pricing, no obligation. If you don't need treatment, we'll tell you.
Most Frederick homeowners discover mice the same way: small black droppings in a kitchen drawer, scratching in the wall after the house goes quiet, or chewed corners on a cereal box. Mice nest close to food and water, travel along the same routes every night, and reproduce fast enough that the signs you’re seeing rarely represent the full picture.
Two species commonly enter Frederick homes: the house mouse (Mus musculus), which prefers structures and human food sources year-round, and the white-footed mouse (Peromyscus leucopus), which moves indoors from surrounding fields and wooded corridors as temperatures drop. Both can carry hantavirus, salmonella, and leptospirosis, and both contaminate far more food than they actually consume. A single visible mouse usually means more are already nested in spaces you can’t see — which is why setting a few traps rarely resolves the underlying intrusion. The entry points, the food access, and the harborage all have to be addressed together.
60+ years of combined experience. Tell us what you’re seeing — we’ll come look, no obligation.
We contacted Troy from Pest Shield when another exterminator told us we had a mouse infestation in our attic. They wanted to remove all our insulation, find and eliminate the mice as well as block any holes and blow in new insulation. The cost was going to be about 5K to do all this. We didn’t feel comfortable just paying that kind of money without getting a second opinion, so we contacted Pest Shield for help. Troy came out the same day, inspected our attic and told us there was no infestation and very little evidence of any mice in our attic at all. Talk about a sense of relief, whew! Pest Shield now handles all our pest needs. Troy is very honest, dependable and keeps all the critters out of our house. Trust Troy and his team and you won’t regret it for a minute.
John Moore · June 2023 Read on Google →
Troy was very knowledgeable, professional, courteous, and prompt. They eliminated my mice problem and came out for follow up visit to seal off any entry points from outside. Very reasonably priced for the service provided. Used top notch products, instead of just sitting out glue traps. Highly recommend them.
Kevin Smith · February 2016 Read on HomeAdvisor →
We used Pest Shield to eliminate some unwanted mice. They responded quickly to our inquiry & we got an appointment within a couple days. They thoroughly explained to us what the appointment would entail and what to expect. Our biggest concern was the safety of products being used around our two dogs. Troy inspected the house inside and out, explained to us his plan & answered all our questions. We are very happy with this company’s service and would highly recommend them. The best part – no more mice!
anne brown · February 2022 Read on Google →
General pest & rodent control
Every new mouse control job starts with a free inspection. Troy or one of our technicians walks the property — interior trouble spots, exterior foundation, crawl space, attic, garage — to identify the actual scope of the intrusion, locate entry points, and find what’s drawing mice in. We document what we find before we recommend anything, and we tell you when treatment isn’t needed. Troy has inspected Frederick attics where another company quoted around $5,000 to strip and replace insulation, and found minimal mouse evidence that didn’t warrant the work. That kind of honest second opinion is something Frederick homeowners have come to expect from us.
For most Frederick homes, the practical next step is enrolling in our Standard Care Plan. Mice are a year-round pressure here — once one population is cleared, surrounding pressure from fields, woodlots, and neighboring properties continues. The Standard Care Plan treats your home’s exterior every 60 days (bi-monthly, more frequent than the industry-standard quarterly cadence), carries a 100% effective guarantee with free retreatment between visits if activity reappears, and requires no one to be home for the service. It’s the difference between resolving the current intrusion and keeping the underlying pressure from rebuilding.
Our products are EPA-approved and the work is done primarily from the outside, which keeps the chemistry away from kids, pets, and food prep areas inside your home. When interior baiting is necessary, stations are placed in inaccessible locations — behind appliances, in utility spaces, inside tamper-resistant housings — and Troy will walk you through any precautions before he leaves. For broader seasonal pest pressure beyond rodents, our pest control in Frederick program addresses the full range of pests that affect Frederick homes year-round.
Owner
Founded Pest Shield in 2011 after years as a pest management contractor on U.S. military bases in Iraq and Afghanistan. Around 35 years in pest management. Personally handles or leads the majority of service calls.
Pest Management Specialist
Field technician handling residential and commercial service calls across Frederick, Carroll, and Montgomery counties.
Pest Management Specialist
Field technician handling residential and commercial service calls across the service area.
Our Entomologist
Consulting entomologist on species identification, conducive conditions, and treatment strategy for difficult cases.
Pest Shield serves all of Frederick, from the historic downtown grid to the newer subdivisions along Route 26, Route 40, and the Route 15 corridor. We work neighborhoods near the Monocacy River, properties backing up to the wooded foothills west of the city near the Catoctin range, and homes throughout Frederick County including Walkersville, Urbana, New Market, Middletown, and Myersville.
Frederick’s mix of older downtown housing — stone foundations, aging sill plates, century-old construction gaps — and newer development bordering farm fields and tree lines creates persistent mouse pressure from multiple directions. When fall temperatures drop, mice migrate from surrounding agricultural land and wooded corridors toward heated structures, and Frederick’s housing stock offers plenty of entry points on both ends of the age spectrum. Mice aren’t the only pest that exploits these seasonal entry points — rat control in Frederick addresses a related rodent pressure that affects many of the same properties.
Yes. Pest Shield uses EPA-approved products and works primarily from the exterior of your home — Frederick customer John Moore noted that this approach “keeps the chemicals out of your home, protecting your family.” When interior bait stations are necessary, they’re placed in locations children and pets cannot access, often inside tamper-resistant housings. Troy will walk you through any specific precautions before he leaves the property, and we’ve serviced Frederick homes with crawling babies, young children, immunocompromised family members, and indoor pets.
Initial treatment typically resolves the active intrusion within about 30 days, and we return for a follow-up visit to verify results and seal entry points. For most Frederick homes, ongoing service is the practical way to keep mice out long-term — surrounding pressure from fields, wooded lots, and neighboring properties doesn’t go away. Our Standard Care Plan treats the exterior every 60 days, carries a 100% effective guarantee, and includes free retreatment between scheduled visits if activity reappears. That said, if your situation doesn’t warrant ongoing service, we’ll tell you.
The inspection is free, and we typically schedule Frederick service calls for same-day or next-day. Troy has been documented responding to inquiries within minutes and arriving the same morning on Sundays at no extra charge. Call (301) 829-0060 to schedule — you’ll talk directly to Troy, our office staff, or a technician, not a call center.
Frederick’s fall temperature drop pushes mice from surrounding fields, wooded corridors, and the Catoctin foothills toward heated structures every year. House mice and white-footed mice can squeeze through gaps as small as a quarter inch, and Frederick’s housing stock — older downtown homes with foundation gaps, newer suburban builds with utility penetrations and unsealed siding corners — offers consistent entry points. Unless the entry points are sealed and the exterior pressure is interrupted on a recurring basis, the cycle repeats every fall as soon as temperatures fall.
Consumer traps and bait kill the mice you see, but they don’t address the entry points, the nesting voids, or the colony you don’t see — and a few mice that escape a trap will often learn to avoid it. Pest Shield uses professional-grade baiting placed where mice actually travel, identifies and seals the entry points letting them in, and returns to verify the population is knocked down. If your situation genuinely is a single mouse and a sealed gap, we’ll tell you that and recommend a do-it-yourself approach. Frederick customers regularly come to us after trap-and-bait kits failed to resolve a recurring intrusion.
