Which rodent are you actually dealing with?
Start with where you found the evidence, not with the size of the animal. Droppings in a kitchen drawer, a pantry or under a sink almost always mean house mice, which live entirely inside heated space and stay within a short radius of a nest. Droppings in a detached garage, a shed, a crawlspace or a vehicle that sat all winter point toward deer mice, the species Colorado reports alongside house mice and Norway rats. Deer mice are brown on top and white underneath with a sharply two tone tail, and they are the reason the cleanup protocol exists. Heavier sound, burrow openings near a foundation, and gnawing at ground level mean Norway rats. They dig, they stay low, and they work alleys, dumpsters and dense shrubbery rather than attics. Getting this right changes the plan. Deer mice in an Aurora shed call for wet cleanup and exterior sealing. House mice in a kitchen call for interior trapping and closing penetrations. Rats call for a look at harborage and burrows across the whole lot, since they forage well beyond the nest.
A month by month rodent calendar for Aurora
March through May is the exposure season rather than the infestation season. People open sheds, garages and campers that sat closed all winter, and whatever nested inside left dried droppings behind. That is the moment to ventilate for half an hour and clean wet, not the moment to grab a broom. June through August, activity moves outdoors and into the cool hours, since Aurora summer highs sit near 89F. rodents work irrigated beds, compost, birdseed and pet bowls, and the population builds quietly where nobody is looking. September through November is the entry window. Nights cool fast at 5,403 feet, outdoor cover dies back, and animals test buildings all at once. Sealing done in August pays for itself here. December through February looks quiet outdoors and is not quiet indoors. With winter lows averaging 18F, anything already inside a heated wall keeps breeding, so a house can get steadily worse while the yard shows nothing at all.
How to clean a shed or garage without breathing the dust
The dangerous part of a rodent cleanup is the first five minutes, and dry mountain air makes it worse by turning droppings to powder. Open every door and window first and walk away for 30 minutes so the space airs out. When you go back in, wear gloves and mix roughly 1.5 cups of household bleach into a gallon of water. Soak the droppings, nests and urine trails until they are visibly wet, wait five minutes, then pick everything up with paper towels and bag it. Wipe down countertops, shelves and any surface the animals crossed. Wash your hands afterward. What you must not do is sweep or vacuum, because both throw particles into air you are standing in. The CDC has recorded 890 hantavirus cases in the United States since 1993, roughly a third of them fatal, and enclosed outbuildings in western states are where the exposures happen. Two provisional Colorado cases turned up in 2025. Wet cleanup takes ten extra minutes and removes essentially all of that risk.
What a first inspection should cover on an Aurora property
A real first visit runs an hour or more and covers three zones rather than one. Outside, the inspector should walk the whole perimeter looking at the sill plate line, foundation and crawlspace vents, dryer and utility penetrations, the garage door corners and threshold, hose bib openings, and any burrow holes at the base of a wall or under a deck. Inside, they should be reading runways: grease marks along baseboards, droppings under appliances, gnawed packaging, and disturbed insulation where a pipe enters a cabinet. In the attic they are looking for trails through insulation, nesting material, and daylight showing at the eave. They should also look at the yard as a system. Irrigation leaks, rock mulch pressed against the foundation, woodpiles, birdseed and dense juniper are all harborage in a dry city where water and cover are the limiting factors. What you should get at the end is a written list of specific openings with a specific repair proposed for each, plus where traps go and how many visits are included.
Bait, pets and raptors: the conversation to have first
Rodenticide is the part of this trade that deserves the most honesty. Anticoagulant baits do not kill quickly. The animal keeps moving for several days, gets slow, and becomes easy prey, which is how the poison ends up in the owl, hawk, fox or neighbor's dog that eats it. That is secondary poisoning, and it is the reason several states have pulled second generation products back from general use. None of that means bait is never appropriate. Heavy Norway rat pressure coming off an alley or a neighboring lot is a case where locked exterior stations, serviced by someone licensed, are the practical tool. What matters is that bait is a supplement to sealing, never the plan itself. Before anyone puts a station on your property, ask three things: which active ingredient is in the block, whether the stations are locked and anchored, and what happens if a dog gets into one. A provider working around Aurora yards with pets and backyard chickens should have clear answers ready, along with a sealing list to go with it.