House mice are introduced commensal rodents in New Hampshire, and NatureServe’s SNA rank, not applicable, reflects that introduced species don’t receive a state conservation status. Nearly all of the 22 records here, 21 of 22, come from GBIF rather than casual photographs, meaning trapping and specimen collection, not people spotting mice, accounts for almost everything documented about this species in the state.
Records are erratic rather than seasonal, a single sharp spike of 7 in July against near-total silence the rest of the year, a pattern that likely reflects one or two concentrated trapping efforts rather than any real summer surge in mouse activity, since house mice breed indoors year-round regardless of outside season.
Full species profile
