The rat Colorado homeowners deal with is the Norway rat, a non-native rat found in Colorado and across the rest of the U.S. It is stocky and a strong burrower. The roof rat, a climber more common in warmer states, is largely absent from interior states apart from isolated infestations, so rat work here usually starts at ground level.
Water and shelter shape where rats settle. Rats favor creek and ditch banks, junk and clutter, and dense vegetation near buildings. Properties near ditches, compost piles or chicken coops can see more rat pressure for that reason.
Rats do not slow down for winter. Skedaddle's Colorado rat article explains that Norway rats remain active through the cold months, tunneling beneath foundations to nest. Rat reproduction peaks in spring and fall, with an average female producing 20 or more young a year.
For your home, that means we inspect the ground around the foundation as carefully as the house itself and pair removal with sealing and safe cleanup.