House mice are introduced commensal rodents in New Jersey, and NatureServe’s SNA rank, not applicable, reflects that introduced species don’t receive a state conservation status. iNaturalist holds 63 of the 72 records and GBIF 44, many of them the same sightings, which suggests both casual photographs and structured survey work feed New Jersey’s record.
Records spike sharply in September, 17 sightings, more than double any other month and roughly a quarter of the dated total, a pattern that likely tracks late-summer population growth spilling into visible spaces before autumn cooling pushes mice back indoors.
Full species profile
