The First Hard Freeze and Mice in Golden, CO

Heat is the main lure. Every seam of a heated house leaks a trickle of warmth, and a mouse can pick that up at a door sweep or a vent. The animal that spent August under a wood stack may be testing your foundation by November.

Food counts too. Cold weather thins out what is available outdoors, which makes pet food, birdseed, pantry staples and the crumbs under a stove far more valuable. One open bag of dog food in a garage can keep a mouse close all winter.

We do not claim that any single street in Golden has more of this than another. We keep no counts, and an honest gap beats an invented figure. The pattern itself is common wherever winters are cold.

Choose a dry afternoon and circle the whole house with a flashlight, even by day. Look low first, along the foundation, and then work upward toward the roof.

• Foundation: cracks, gaps at the sill plate and holes at the foot of the siding.
• Vents: crawl space screens, dryer vent flaps and bath fan covers, pressing each to see if it wobbles.
• Utility entries: pipes, gas lines and cables, checking for a gap around each.
• Garage: the bottom seal, every corner of the door and the side entry.
• Roof edge: soffits, fascia and the spots where a chimney or dormer meets the roof.
• Contact points: branches, trellises and steps touching the house.

Mark each spot with painter's tape or a photo. A list of ten small defects is far easier to fix than a vague hunch that something is wrong.

Water seeps into tiny cracks, freezes and expands, then thaws and leaves the crack a bit wider. Over one winter a hairline in masonry or siding can grow into a mouse-sized door. Sealant also stretches and shrinks with temperature, and old sealant may peel away from its edges.

That is the reason for a second walk. Look again after the spring thaw, because gaps opened by winter are the ones that matter next autumn.

Sounds tell you something even when the animal stays hidden. Scratching low inside a wall suggests mice working along a stud bay. Light patter overhead points to the attic. Squeaks are common when young mice are present.

Jot down the room, the hour and the duration. A quick note on your phone is plenty, and those three facts speed a phone call far more than a long description.

• Pause beside the pantry, near the water heater closet and along any garage wall shared with the kitchen.
• Look at the backs of drawers and cabinets for pellets.
• Check the oven drawer and beneath the refrigerator.
• Peek at the lowest pantry shelf, where bagged and boxed goods sit.

Do not sweep up droppings. The CDC advises dampening them with disinfectant and wiping them up, since dry sweeping lifts dust into the air. The safety box below spells out the steps, and it is worth reading before any cleaning.

Stay away from loose bait. A mouse that eats poison frequently dies inside a wall, and the odor may linger for weeks. The EPA page in the sources list explains why some products are restricted.

Skip sticky boards if pets or wildlife live nearby, because they trap lizards and birds as readily as mice.

• Week one: tour the outside with a flashlight and photograph every gap.
• Week two: close what you can with metal mesh and sealant, or book help for the rest.
• Week three: move pet food and seed into lidded tubs and swap cardboard for plastic.
• After the thaw: walk again and fix whatever winter opened.

A professional inspection is wise if you find more than a handful of gaps, hear sounds at night or cannot tell which defects matter. Sealing work closes the openings in metal.