The Norway rat isn’t a Utah native. NatureServe doesn’t even rank it, since it’s flagged as an introduced species statewide, and the recorded cluster around Antelope Island State Park, Great Salt Lake, and the Wasatch Range foothills tracks people and infrastructure, not wild habitat.
Utah’s roughly 227 records lean on both iNaturalist and GBIF in close to equal measure, a mix that fits a rat found around docks, farms, irrigation ditches, and Salt Lake City’s urban edge rather than deep in the mountains. It follows food and shelter wherever people have built it.
Records stay fairly steady through the year, with a modest late-summer and fall rise that likely tracks when rodent surveys and pest reports pick up rather than any breeding surge. That flat pattern is typical of a species that doesn’t hibernate and keeps close to stable food sources year-round.
Full species profile
