Increased Rodent Activity Indoors This Month: Why Cooler Weather Drives Mice Inside and the Hidden Risks of Hantavirus
Hantavirus Prevention in Colorado
As temperatures begin cooling across Colorado, we’ve seen a noticeable increase in indoor rodent activity throughout the Denver Metro and Aurora areas this month. Homes, restaurants, garages, warehouses, and commercial buildings are all seeing increased mouse activity as rodents begin searching for warmth, food, and shelter indoors.
At Apex Pest Management, we commonly see spikes in rodent calls during seasonal temperature swings, especially after cooler nights, storms, or sudden drops in temperature. While rodents are always a nuisance, they can also pose serious health risks to families, employees, and customers.
One of the biggest concerns associated with rodent infestations in Colorado is hantavirus.
Why Rodents Move Indoors During Cooler Weather
Mice and rats are opportunistic survivalists. As outdoor conditions become less favorable, they begin searching for:
• Warm shelter
• Reliable food sources
• Water sources
• Protected nesting areas
Rodents can enter structures through incredibly small openings. Mice can squeeze through gaps as small as a dime, while rats only need openings about the size of a quarter.
Common rodent entry points include:
• Garage door corners
• Utility penetrations
• HVAC line gaps
• Foundation cracks
• Damaged weather stripping
• Roofline openings
• Crawl spaces and vents
• Gaps under doors
Once indoors, rodents often nest in:
• Attics
• Basements
• Garages
• Utility rooms
• Wall voids
• Drop ceilings
• Storage rooms
• Kitchen areas
The Link Between Rodents and Hantavirus
Hantavirus is a rare but potentially deadly disease spread primarily through infected deer mice, which are common throughout Colorado.
People can become exposed when they breathe in contaminated airborne particles from:
• Rodent droppings
• Urine
• Saliva
• Nesting materials
This often happens during cleaning activities in garages, sheds, crawl spaces, basements, cabins, or storage areas where rodents have been active.
One of the most dangerous mistakes people make is sweeping or vacuuming rodent droppings dry. This can aerosolize contaminated particles into the air.
Common Symptoms of Hantavirus
Early symptoms can resemble the flu and may include:
• Fever
• Fatigue
• Muscle aches
• Headaches
• Chills
• Nausea
As the disease progresses, severe respiratory symptoms can develop quickly.
Safe Cleanup Recommendations
If rodent activity is present, proper cleanup procedures are critical.
The CDC recommends:
• Wearing gloves and a mask or respirator
• Ventilating enclosed areas before cleaning
• Spraying droppings and nesting materials with disinfectant
• Allowing disinfectant to soak before wiping up
• Avoiding dry sweeping or vacuuming contaminated areas
Signs You May Have Rodent Activity
Some common warning signs include:
• Droppings in cabinets or storage areas
• Scratching sounds in walls or ceilings
• Gnaw marks on food packaging or wiring
• Grease rub marks along walls
• Strong musky odors
• Pet food disturbance
• Nesting material such as shredded paper or insulation
Prevention Tips for Homes and Businesses
Preventing rodents starts with exclusion and sanitation.
We recommend:
• Sealing gaps and entry points
• Storing food in sealed containers
• Keeping clutter reduced
• Managing exterior vegetation and debris
• Cleaning spills and crumbs promptly
• Inspecting garages, utility penetrations, and door sweeps regularly
• Using professional monitoring and baiting programs when needed
Commercial facilities, restaurants, warehouses, and multi-family properties are especially vulnerable during seasonal transitions.
Professional Rodent Control in Denver and Aurora
At Apex Pest Management, we provide professional rodent inspections, trapping, exclusion recommendations, monitoring programs, and preventative pest management services for residential and commercial properties throughout the Denver Metro area.
Our programs focus on identifying the root cause of rodent activity instead of simply placing traps.
If you’ve noticed increased rodent activity indoors recently, it’s best to address the issue early before populations grow and contamination risks increase.
Apex Pest Management
Aurora, Colorado
303-667-7193
apexpestmgt.com
