House mouse records in Montana follow human structures more than any particular landscape; NatureServe flags the species as exotic, not part of the state’s native fauna. Reports near Red Rock Lakes, Flathead Lake, and the Missouri River corridor likely trace back to buildings and campgrounds rather than open habitat.
Reports rise in June, July, and September, with a further spike in December, a pattern that doesn’t map onto any single clean cycle for a species that can turn up near structures nearly any time of year. With 105 total records, all from GBIF, much of the documentation likely comes from pest-survey data rather than casual sightings.
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