Pest Library · West Texas
House Mice in West Texas
The first cold front of fall sends mice looking for a warm place to spend the winter. In the Basin, that often means your garage, attic or kitchen walls.
Quick answer
The house mouse is a small grayish brown rodent with a long, nearly hairless tail. You'll usually find signs before you see one: small dark droppings, gnaw marks and chewed food packages. Mice can slip through a gap about the size of a dime, so sealing holes is the key to keeping them out for good.
How to Identify a House Mouse
Texas A&M AgriLife describes the adult as:
- About 5 to 8 inches long including the tail
- Weighing only ½ to 1 ounce
- Grayish brown on top
- With a furless tail, large ears and small eyes
A young rat can look like a mouse. Rats have a bigger head and feet for their size. If you aren't sure, a technician can tell from droppings and gnaw marks.
What Mouse Droppings Look Like
Droppings are often the first clue. AgriLife training material puts rodent droppings at about ⅛ to ¼ inch wide and ¼ to about 1 inch long, and the ones mice leave sit at the small end of that range. They are dark and often pointed at one or both ends. Fresh ones are soft and shiny. Old ones are dry and crumble.
Check these spots:
- Kitchen drawers and the backs of pantry shelves
- Under sinks and behind the stove and fridge
- Along garage walls and in stored boxes
- In the attic near insulation
When you clean up droppings, don't sweep or vacuum them dry, which stirs up dust. Wear gloves, wet the area with a disinfectant first, then wipe it up.
How They Behave
House mice are mostly active at night. They stay close to home and don't roam far from their nest. AgriLife notes a mouse eats only about 1/10 ounce of food a day and doesn't need to drink water every day, so a little spilled pet food can feed a family.
They breed fast. AgriLife lists a pregnancy of about 19 to 21 days and litters of five to six young. Young mice can breed at 6 to 10 weeks old. Two mice in October can mean a lot more by spring.
House mice build small nests from paper, insulation and fabric. They use stored boxes, upholstered furniture and even cabinet drawers.
Why They Matter
AgriLife warns that rodents gnaw on wires, which can start fires. They also soil food with urine and droppings and can carry germs. Many people first notice them by sound. Scratching in the walls or ceiling at night is a common call. Read our post on how to get rid of mice in walls for that problem.
How to Keep House Mice Out
AgriLife says a mouse can get through a hole about the size of a dime or a ¼ inch crack under a door. Sealing is the heart of the fix:
- Fill gaps around pipes and wires with steel wool and sealant.
- Cover vents with ¼ inch hardware cloth.
- Put new sweeps on doors and new seals on the garage door.
- Store food and pet food in sealed containers.
- Move firewood and clutter away from the house.
Traps placed along walls catch mice where they travel. Bait belongs in locked stations, mostly outdoors, so kids and pets can't reach it. For the full plan, see rodent control.
House Mouse FAQs
Are these droppings from mice or rats?
Size is the main clue. Mouse droppings are small, about the size of a grain of rice, with pointed ends. Rat droppings are larger and more capsule shaped. If you find big droppings or gnaw holes larger than a quarter, you may have rats. A technician can confirm which one you have.
How small a hole can a mouse fit through?
AgriLife says a mouse needs only a hole about the size of a dime or a crack ¼ inch wide. That is why checking gaps around pipes, vents, garage doors and the roof line matters. Plugging the obvious hole by the floor often isn't enough.
Why do mice show up in the fall?
As nights get cooler, mice that lived outside in summer look for warm, dry places near food. Fields and brush lots around Odessa and Midland hold lots of them. Homes and garages with small gaps are the easiest places to move into.
Is it safe to clean up mouse droppings myself?
Small cleanups are fine with care. Wear gloves, open windows, spray the droppings with disinfectant and let it soak, then wipe up with paper towels. Don't sweep or vacuum dry droppings. For a large mess in an attic or shed, ask a professional.
Same Day Service Available
Get Help With Mice
Hearing scratching or finding droppings? Request a free inspection. Your technician will find the gaps and set traps where mice travel.
Odessa Pest Control connects you with a local pest control technician. Ask for their Texas license number before work starts.
Pest Library
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Sources
- Texas A&M AgriLife Extension, Managing Rats and Mice (L 1916): https://mytexas.ag.tamu.edu/publications/managing-rats-and-mice/
- Texas A&M AgriLife Extension, Rodent IPM: https://extensionentomology.tamu.edu/wp-content/uploads/sites/6/2022/04/Rodent-IPM-2021.pdf
- Texas A&M AgriLife Extension, Rodent Biology and Behavior: https://extensionentomology.tamu.edu/wp-content/uploads/sites/6/2022/04/Rodent-ID-bio-and-behavior_NQuinn.pdf