The short version
Across Centennial, Colorado, rodent control is mostly a garage, shed, and crawlspace job: seal openings down to 1/4 inch, trap the mice already inside, and clean droppings the CDC way. Deer mice are the main concern because they carry hantavirus, and exposure peaks during spring cleanouts from March through May, with a second indoor push in fall.
- Spring garage and shed cleanouts are the riskiest rodent chore in Centennial.
- Deer mice carry hantavirus; ventilate 30 minutes and wet droppings before wiping.
- Irrigated lawns and bird feeders give mice food and water in a dry climate.
- Fall lows near 18F send house mice and Norway rats indoors.
- A solid quote lists entry points, materials, and how many trap checks are included.
This is for Centennial homeowners who found droppings on a garage shelf, families getting ready to clear out a shed or crawlspace after winter, renters seeing mouse signs in a rented unit, and small office or property managers near the Denver Tech Center who want to know what a reasonable rodent plan looks like.
What to look for
Deer mice are the rodent that sets the tone here. They live in grass, shrubs, and the edges of open ground, and they move into garages, sheds, and crawlspaces whenever shelter and food line up. They are also the primary carrier of hantavirus in the West, which is why droppings in a closed space call for care instead of a broom. House mice come in mostly in fall and settle into kitchens and wall voids. Norway rats, when they show up, tend to stick near trash enclosures, compost, and drainage areas. The climate shapes the pattern. Centennial gets only about 16 inches of precipitation a year with roughly 50% average humidity, so watered lawns, drip lines, pet bowls, and leaky hose bibs become magnets. Summer highs near 88F keep rodents active outdoors, while winter lows around 18F push them inside. At 5,830 feet, fall cools quickly, and gaps around garage doors and utility lines get tested early.
- 1Droppings on garage shelves, inside storage bins, or near the water heater.
- 2Chewed bags of bird seed, grass seed, or dog food.
- 3Nests of shredded paper, fabric, or insulation in boxes and stored furniture.
- 4Scratching in a wall shared with the garage, especially at night.
- 5Small holes gnawed in cardboard boxes or the corners of plastic bins.
- 6A sharp, musty odor in a shed or crawlspace that has been closed.
- 7Burrow openings near a compost pile, woodpile, or along the foundation.
Why it’s worth acting soon
- Hantavirus exposure grows the longer droppings and nests sit in a closed space.
- Mice in a garage often move into the house once the weather turns cold.
- Chewed vehicle wiring and stored items can add up to costly replacements.
- Contaminated insulation in a crawlspace usually needs removal, not just cleaning.
- House mice breed through the winter once they are established indoors.
35%Hantavirus cases fatal, 1993 to 2023CDC Treatment options and typical costs
Garage and foundation sealing
Quoted after inspection
Closing entry points down to 1/4 inch, including the bottom seal of the garage door, gaps where utility lines enter, foundation vents, and openings around air conditioning lines. Durable materials like steel wool backed with sealant, hardware cloth, and metal flashing last longer than foam. Ask for a list or photos of what was closed.
- Time
- Depends on how many gaps turn up
- Best for
- Homes with mice in the garage or recurring fall entry
Snap traps along walls
Quoted after inspection
Snap traps placed along walls and behind stored items, with the trigger toward the wall, catch mice where they travel. They avoid the problem of poisoned mice dying in wall voids. A provider should return to check traps and reset them until there is a clean check with no new activity.
- Time
- Until a check finds no new activity
- Best for
- Active mice in garages, basements, and kitchens
Professional cleanup and disinfection
Quoted after inspection
After rodents are gone, nesting areas and droppings need cleanup using the CDC method: air the space out for 30 minutes, soak droppings with bleach solution for 5 minutes, then wipe up and bag the waste. Ask whether the crew uses respirators and how they handle contaminated insulation.
- Time
- Depends on the space and how soiled it is
- Best for
- Sheds, crawlspaces, and garages with nests
Exterior bait stations
Quoted after inspection
Locked stations placed outside, along fences or foundations, can reduce Norway rats or heavy outdoor mouse pressure. They should be anchored and tamper-resistant. Ask what product is used, how pets are protected, and how often stations are inspected and refilled.
- Time
- Ongoing service
- Best for
- Outdoor rat activity near trash or compost
Prices are typical published ranges. Ask what’s included before you compare quotes.
Clutter gives mice cover. Keeping stored fabric in lidded bins and off the floor takes away the nesting spots they like best.How to clean out a Centennial garage or shed safely.
It is opening a shed, crawlspace, or corner of the garage that deer mice used all winter and starting to sweep. Dried droppings and urine can carry hantavirus, and sweeping or vacuuming puts particles in the air. The CDC method avoids that. Open doors and windows and let the space air out for 30 minutes before you start. Wear rubber or nitrile gloves. Mix 1.5 cups of household bleach in a gallon of water, spray droppings and nesting material until soaked, and leave it for 5 minutes. Then wipe up with paper towels, bag everything, and spray the area again. For heavy nests in an enclosed space, many homeowners prefer to hire it out. Ask any provider whether their crew wears respirators and how they dispose of contaminated material. Plan these cleanouts for March through May, when exposure peaks, and do them before stored items get moved back into use. The most dangerous rodent moment in a Centennial home is not seeing a mouse.
How suburban yards feed rodents in a dry climate.
Suburban yards change that. Irrigated lawns and garden beds hold moisture and insects. Drip lines and sprinkler heads leak. Pet water bowls sit on patios. Hose bibs drip. Each is a water source that deer mice and house mice can count on, and many sit right next to the foundation. Food follows the same pattern. Bird feeders drop seed that mice gather at night. Pet food stored in the garage, grass seed bags, and garden produce all add up. Firewood stacks and dense shrubs against the house provide cover between food and shelter. Fixing this does not mean giving up the yard. Move feeders away from the house and clean up spilled seed. Store pet food and seed in metal cans. Fix leaks near the foundation. Trim shrubs back from siding. Each change makes the area around your house less useful to rodents, which makes sealing and trapping more effective. Centennial gets about 16 inches of precipitation a year, which makes water one of the scarcer resources for rodents.
Dense shrubs against the house and a dripping hose bib give rodents cover and water. Trimming back and fixing drips makes the yard less inviting.A seasonal rodent plan for Centennial.
March through May is cleanout season. Deer mice have spent winter in sheds, garages, and crawlspaces, and people open those spaces up. Use CDC cleanup steps and set traps in garages before moving stored items. June through August, with highs near 88F, rodents breed outdoors. This is the best time to seal the garage door, utility lines, and foundation vents, and to fix irrigation leaks that draw mice to the house. September through November, as nights cool quickly at 5,830 feet, house mice and some deer mice push indoors. Garages are often the first point of entry. Set traps along garage walls in early fall. December through February, with lows near 18F, any mice that got in are nesting. Keep traps checked in the garage and basement and watch for new droppings. Following this calendar keeps the yearly work small. Rodent activity in Centennial shifts with the seasons, and a plan that matches the calendar works better than reacting to each sighting.
What a provider should check on a suburban Centennial house.
The garage door bottom seal and side weatherstripping are common gaps. Where air conditioning lines, gas lines, and cable enter the house, gaps around the penetration often go unsealed. Dryer vents and roof vents need screens or covers that close properly. Foundation and crawlspace vents should be screened with hardware cloth. Where decks or porches meet the house, gaps behind the trim are easy to miss. Inside, the provider should look at the garage, the area behind the water heater and furnace, under sinks, and any crawlspace or attic access. Droppings show which species is present and how active they are. By the end of the visit, you should have a written list of entry points and how each will be sealed, a trap plan with locations, and a follow-up schedule. If deer mouse nests were found, ask what cleanup is recommended. A visit that ends with traps but no sealing plan is incomplete. A thorough rodent inspection on a suburban Centennial house covers the outside first, because that is where entry points are.
What should you ask before hiring a rodent company?
Ask what entry points they found and how each will be sealed. Steel wool backed by sealant, hardware cloth, and metal flashing hold up; foam alone often gets chewed. In Centennial homes, the garage door seal and utility penetrations should be on the list. Ask how many follow-up visits are included and what happens if mice keep showing up after that. Mice can test a house repeatedly through fall, so one return trip may not be enough. Ask whether they use traps, bait, or both, and where. Indoor bait can lead to mice dying in walls. Exterior stations should be locked and anchored. Ask about cleanup. If deer mice were nesting, does the quote include CDC-style cleanup, and does the crew use respirators? And ask for everything in writing. A clear written plan makes it easy to compare quotes and check the work later. A few questions sort out a solid plan from a quick one.
What affects the price
- The number of entry points and how hard they are to reach.
- Whether a crawlspace needs inspection, cleanup, or insulation removal.
- Garage size and how much storage must be moved.
- How many follow-up visits are included.
- Whether rats are involved, since they require more devices.
- Sheds and outbuildings that need separate inspection.
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What's your biggest concern about rodents?
When to call for help
Call a professional if you find more than a few droppings in a closed shed, crawlspace, or attic, especially if you are not sure whether they came from deer mice. Cleaning a heavily used space without a respirator can mean real exposure. Bring in help too if mice keep returning after you have trapped and sealed what you could find, which usually means entry points are hidden at the roofline or behind siding. Across Centennial, burrows along a foundation or rats near trash enclosures are also a sign that a provider with exterior stations and broader trapping coverage will do better than indoor traps alone.
What you can do yourself
For a mouse or two in the garage, DIY makes sense. Set snap traps along the walls, put pet food and seed in metal cans, and seal the gap at the bottom of the garage door. That handles a lot of Centennial cases. DIY gets harder when you cannot find how mice are getting in, when there are signs in more than one part of the house, or when the job involves cleaning a closed space with heavy droppings. The CDC cleanup steps are clear, but a shed full of deer mouse nests is a lot of exposure, and some homeowners prefer someone with respirators and disposal plans. Rats are another step up, because they avoid new traps at first and range far beyond the house. A practical split: DIY for small garage problems, a pro for whole-house sealing, heavy cleanup, and anything involving rats.
Rodents in Centennial
Centennial was founded in 2001 and holds about 107,000 people in a suburban layout that also takes in the office corridor around the Denver Tech Center. In a suburban setting like this, garages, sheds, and backyards are where most rodent trouble starts. The climate is semi-arid at 5,830 feet, with only about 16 inches of precipitation a year and humidity near 50%, so the water that lawns, gardens, and pet bowls provide stands out to rodents. Summer highs near 88F and winter lows around 18F create two pressure points: spring and summer, when deer mice are active and people clean out closed spaces, and fall, when mice move indoors. The median home value of about $595,000 means many owners want sealing work done neatly and durably. CDC tables show Colorado with 2 provisional hantavirus cases in 2025, a reminder to handle droppings carefully.
Local research
Rodents in Centennial, CO: what the public record shows
Before you compare quotes, it helps to know which rodents actually live in Colorado, when they are busiest around Centennial, and what the state figures look like. Everything below links to the agency or university page it came from.
Rodent species recorded in Colorado
- House mouse (Mus musculus) — Enters at 1/4 inch; 5-10 litters per year; eats about 200 small meals a night.
- Norway rat (Rattus norvegicus) — Burrowing rat of basements, sewers and ground floors; tail shorter than head plus body.
- Deer mouse (Peromyscus maniculatus) — Primary U.S. hantavirus carrier; lives throughout Washington and the interior West.
When rodents are busiest around Centennial
Spring cleanup exposure; summer. Deer mice and hantavirus in NM/AZ/CO/NV; plague fleas on wild rodents.
Based on Centennial’s semi-arid climate profile.
For context, nationally
- 1/4 inch (the width of a pencil) — Smallest gap a mouse can enter. CDC
- 890; 35% fatal; 94% west of the Mississippi — Hantavirus cases reported since 1993 (through 2023). CDC
Sources: CDC National Notifiable Diseases Surveillance System; CDC; Pest Notes: House Mouse; Pest Notes: Rats; Hantavirus. Figures are quoted as the source prints them. How we check our sources
Simple ways to keep rodents away
- Replace a worn garage door bottom seal so no daylight shows beneath it.
- Keep bird seed, pet food, and grass seed in metal cans with lids.
- Move bird feeders away from the house and sweep up spilled seed.
- Fix dripping hose bibs and sprinkler leaks near the foundation.
- Store items in plastic bins with lids rather than cardboard boxes.
- Keep firewood stacked off the ground and away from walls.
- Screen foundation and crawlspace vents with 1/4-inch hardware cloth.
- Open and air out sheds periodically, rather than leaving them sealed for months.
In a multi-unit building, mice move between apartments through shared walls and pipe chases, so treating one unit rarely solves it. Ask for a building-wide plan.Did you know?
Mice can slip through a gap just 1/4 inch wide, about the width of a pencil, according to the CDC.
Plague, Lyme disease, and murine typhus are among the illnesses the CDC says rodents spread indirectly through fleas and ticks.
UC IPM notes a Norway rat female can wean 20 or more young per year from 4 to 6 litters.
Questions people ask
Why is spring the riskiest time for hantavirus in Centennial?
Spring is when people clear out garages, sheds, and crawlspaces that deer mice used all winter. Sweeping or vacuuming dried droppings throws virus particles into the air. Across Centennial, plan any big cleanout between March and May with the CDC steps: ventilate for 30 minutes, soak droppings with bleach solution, wait 5 minutes, then wipe.
How common is hantavirus in Colorado?
It is uncommon but serious. CDC provisional tables counted 17 hantavirus cases nationally in 2025, with 2 in Colorado. The CDC reports 35% of cases since 1993 have been fatal. Deer mice live around Centennial, so treat droppings in closed spaces with care rather than alarm.
Do mice come inside in fall in Centennial too?
Yes. Winter lows around 18F push house mice, deer mice, and the occasional Norway rat toward heated spaces, and garages are often the first stop. Sealing the garage door and utility gaps in late summer, before September, is the best way to keep them out.
Can I vacuum mouse droppings in my garage?
No. The CDC says never to sweep or vacuum rodent droppings, because it puts particles into the air. Open the garage for 30 minutes first, spray droppings with 1.5 cups of bleach per gallon of water, let them soak 5 minutes, and wipe up with paper towels while wearing gloves.
What draws mice to suburban yards?
Food, water, and cover. In a dry place like Centennial, with about 16 inches of precipitation a year, irrigated lawns, garden beds, and dripping spigots are some of the few reliable water sources. Add bird feeders, pet food, and stored items, and a yard becomes attractive. Removing those draws makes trapping and sealing work better.
Is plague a risk from rodents around Centennial?
The risk is low. The CDC averages about 7 human plague cases a year nationwide, mostly in parts of the West that include southern Colorado. Fleas from wild rodents spread it. Keeping rodents out of the house and pets on flea control are the practical steps.
How can I tell a deer mouse from a house mouse?
Look at the belly and tail. Deer mice have white undersides and a tail that is dark on top and white below, with a sharp line between. House mice are gray-brown all over. If you see a deer mouse or its nest, use the wet cleanup method rather than sweeping.
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Sources (6)
The facts in this article come from the public sources listed above. Every home is different, so ask the company you talk to about pricing and what’s included. Published by Rodent Exterminator · Updated October 11, 2026 · How we write these guides