The short version
Trap the ones inside, then seal the gaps. An inspection usually costs $75–$250.
- Look for droppings, gnaw marks and night-time scratching.
- Across Cheyenne, mice usually start moving indoors in September and October, as nights get colder.
- Traps remove them; sealing keeps them out.
- Never sweep or vacuum droppings dry.
Anyone in Cheyenne dealing with mice or rats, or hoping to keep them out.
What to look for
A mouse fits through a gap the size of a dime. Seeing one in daylight usually means there are more. Rodents are mostly unseen. You hear them at night and find droppings by morning.
- 1Shredded paper, fabric, or insulation gathered into a nest.
- 2Scratching or scurrying sounds in walls or ceilings at night.
- 3Food scattered or hollowed-out fruit and nuts.
- 4Chewed holes in the bottom of cabinets or drawers.
- 5Droppings in drawers, pantries, under sinks, or along walls.
- 6Live sighting, especially during the day.
Why it’s worth acting soon
- Mice breed fast, every few weeks.
- Droppings and urine contaminate food and insulation.
- Gnawed wiring can be a fire risk.
- Nests and odor get harder to clean the longer they stay.
- Deer mice can carry hantavirus.
Treatment options and typical costs
Inspection and Entry-Point Mapping
$75–$250
Skipping this step is why so many homeowners buy traps twice. A proper Cheyenne inspection finds the gap you cannot see from the ground, usually up high or under the deck.
- Time
- 60–90 minutes
- Best for
- Every job; nothing else works without it
Snap-Trap Program
$150–$400 per visit
Snap traps remain the workhorse for rodents inside Cheyenne homes because a caught rodent is proof, not a guess. A Cheyenne pro sets many traps along walls and runways, then returns to check, reset, and remove.
- Time
- 30–60 minutes per visit, 2–4 visits
- Best for
- Active indoor infestations; fast results you can see
Sealing and Rodent-Proofing
$200–$1,500, more for large or complex homes
Price depends on how many openings the Cheyenne inspection found and how hard they are to reach. A Cheyenne ranch on a slab is cheaper to seal than a two-story home with a crawlspace and complex rooflines.
- Time
- 2–6 hours, sometimes a full day
- Best for
- Stopping re-entry for good; the lasting fix
Attic and Crawlspace Cleanup and Sanitation
$500–$3,000, higher if insulation is replaced
Soaked or matted insulation usually has to be replaced. That drives the top of the range in Cheyenne, so ask for a separate line item for insulation.
- Time
- Half day to two days
- Best for
- Heavy contamination; odor, urine-soaked insulation, nesting
Prices are typical published ranges. Ask what’s included before you compare quotes.
Rats can travel plumbing, so a sink or floor drain with a missing strainer is worth fixing; a tight strainer or grate keeps them out.Which rodents live around Cheyenne.
They're small, curious and breed quickly. Norway rats are the other usual suspect. They burrow along foundations and enter low. Deer mice live around Cheyenne too, mostly near open land and in sheds or cabins. They can carry hantavirus, so clean up their droppings carefully. House mice are the most common rodent in Cheyenne homes.
When they move in.
Spring is breeding season. Small problems grow fast. Check for gaps before then.
Fall is when rodents head indoors. Leaf piles against the foundation hide burrows and gaps, so clear them and walk the wall before the first cold snap.How they get into houses here.
Rodents use gaps around utility lines, dryer vents and window wells. Check where pipes and cables enter. Look at the dryer vent flap. Window wells need covers or screens. Plenty of homes in Cheyenne have basements.
A year of rodents in Cheyenne.
- Summer: with highs around 84°F in Cheyenne, rodents look for water. Fix drips and leaks. - Fall: mice move indoors as nights cool. Seal gaps in September. - Winter: with lows near 16°F in Cheyenne, check the attic, garage and pantry for droppings. - Spring: breeding season. Act on any sign quickly.
Mice or rats?
- Rub marks: rats leave greasy smudges along walls and beams. - Droppings: mouse droppings are rice-sized. Rat droppings are two or three times bigger. - Holes: mice chew dime-sized holes. Rats chew holes closer to quarter-sized. - Sounds: mice sound light and quick. Rats sound heavier. - Behavior: mice are curious about new traps. Rats avoid them for days.
Sealing small gaps yourself.
- Check your work: daylight through a gap means it isn’t sealed. - Steel wool or copper mesh: pack it into small gaps first. - Sealant or mortar: cover the mesh so it stays put. - Hardware cloth: use quarter-inch mesh over vents and larger holes. - Door sweeps: close the gap under garage and exterior doors. - Expanding foam: fine on top of mesh, useless on its own.
Cleaning up droppings safely.
- Wash your gloved hands, then your hands. - Air the room out for 30 minutes first. - Wear rubber or plastic gloves. - Spray droppings with a bleach solution, then wait five minutes. - Wipe up with paper towels and bag them. - Don’t sweep or vacuum droppings dry. It stirs up dust.
What happens at an inspection.
The inspector walks the outside first. They check the foundation, vents, rooflines and utility gaps. Inside, they check the kitchen, garage and attic. You should come away with a list of entry points. Photos help. Most inspections take about an hour.
Rodents in the car.
Park in a closed garage when you can. Check the air filter box for nesting. Clear birdseed and pet food from the garage. Mice and rats nest in engine bays and chew wiring.
Bird feeders and rodents.
Use a seed tray and sweep up spills. If rodents show up, bring feeders in at night. Store seed in a metal can with a tight lid. Spilled seed feeds mice and rats.
Questions to ask before you sign.
- Will you use poison inside? (Ask them not to.) - Where are they getting in? - Which gaps will you seal, and with what? - How many trap visits are included? - What happens if they come back? - Is cleanup included, or extra?
Rodents by the numbers.
Across Cheyenne, what actually matters is a walk-through: where the droppings are, how the rodents are getting in, and how large the colony is. Across Cheyenne, those three findings — species, entry points, and scale — are what a quote should be built on, not a regional average. Across Cheyenne, ask any provider to show you the entry points and the plan before you compare numbers. National surveys set rough expectations but cannot diagnose one house.
What affects the price
- Local labor rates and licensing costs.
- Number of trapping visits needed to reach zero.
- Mice versus rats; rats take longer and cost more.
- Exterior bait stations and ongoing service frequency.
- Follow-up visits included versus billed separately.
- Age of the home and condition of the foundation.
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What's your biggest concern about rodents?
When to call for help
Call right away if you see rats. They take a longer, more careful approach. Attic cleanup is hard to do safely without training. Call if you hear them in the attic or walls. Droppings in several rooms are another sign. So is a dead-rodent smell.
What you can do yourself
Start tonight with snap traps along the walls. Bait them with peanut butter. Store food in sealed bins. Seal small gaps with steel wool and sealant. Rooflines, vents and attics are harder. That's where a pro's sealing work pays off.
Rodents in Cheyenne
Cheyenne only gets about 15 inches of rain a year, so local rodents look for water: drip lines, pet bowls and leaky hose bibs. Winter lows average around 16°F in Cheyenne, and that cold is what sends mice looking for a way in. In Cheyenne's neighborhoods, woodpiles, fences, bird feeders and gardens draw rodents close to the house. A typical home in Cheyenne is worth around $330k, and chewed wiring or soiled insulation can get expensive.
Local research
Rodents in Cheyenne, WY: what the public record shows
Before you compare quotes, it helps to know which rodents actually live in Wyoming, when they are busiest around Cheyenne, and what the state figures look like. Everything below links to the agency or university page it came from.
Share of hantavirus infections that are fatal
The Wyoming Department of Health puts the fatality rate for respiratory cases at roughly 38-40 percent.
Wyoming Department of HealthRodent species recorded in Wyoming
- 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 Cheyenne
Spring cleaning of cabins, garages and outbuildings is the flagged exposure window.
Wyoming's rodent risk is the rural deer mouse in outbuildings more than the urban rat.
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: Wyoming Department of Health; Wyoming Department of Health, Infectious Disease Epidemiology Unit; 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
- Check crawlspace doors and vents for chewed openings each fall.
- Declutter garages and attics to remove nesting cover.
- Cap chimneys and repair damaged roof vents.
- Fit garage doors with tight bottom seals and corner guards.
- Walk the exterior each season looking for fresh gnawing.
- Clean up pet waste and do not leave bowls out overnight.
After sealing, a few monitors or unset traps left along the walls tell you whether anything is still getting in before you hear it again.Did you know?
Across Cheyenne, rats make ultrasonic chirps when they're tickled, which researchers compare to laughter.
Across Cheyenne, rats are strong swimmers and can tread water for a long time, which is why they sometimes travel sewer lines.
Questions people ask
Are rats a bigger problem than mice?
Usually. Rats are bigger, chew more, and avoid new traps for days. They also tend to need more sealing work outside.
How long does rodent control take?
Most jobs take two to four weeks. That covers inspection, sealing and a few trap checks.
How do I choose a rodent control company?
Make sure they're licensed in Wyoming. Ask how they seal gaps and what materials they use. Ask what happens if rodents come back. A good company talks about sealing, not just traps.
Do I need to replace attic insulation?
Only if it's heavily soiled or flattened by nesting. Light activity can often be cleaned up. Ask the inspector to show you before you agree to replacement.
Will rodent control harm my pets?
It shouldn't. Traps go where pets can't reach. Bait stations are locked. Tell the company about your pets before they start.
Do wealthier homes get fewer mice and rats?
Not according to homeowner surveys. Across Cheyenne, in the National Pest Management Association's (NPMA) September 2022 Harris Poll of more than 1,300 U.S. homeowners, 52% of those earning $100,000 or more said they had ever had a rodent problem, slightly above the 49% for homeowners overall. Across Cheyenne, find out up front how many visits are included and what the company does if the rodents come back.
How common are rodent problems in U.S. homes?
Very common. If you have found a mouse in the house, you are in a large club: 49% of U.S. homeowners in a 2022 NPMA/Harris Poll reported a rodent encounter at some point in their lives.
Are rodents a problem in Cheyenne?
They're common here, as almost everywhere. House mice cause most problems.
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Sources (10)
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 September 11, 2026 · How we write these guides