New Jersey holds 96 grey seal records, split between iNaturalist sightings and GBIF data, and nearly all of them cluster in the first few months of the year. A grey seal here is a winter visitor, not a year-round resident, and the records track that rhythm closely.
Winter haul-outs along the barrier beaches
Records concentrate at Sandy Hook on the northern tip of the Jersey Shore, Island Beach State Park’s undeveloped barrier island, and the calmer waters of Barnegat Bay behind it. All three offer exactly what a hauled-out grey seal wants: a quiet sandbar or beach away from heavy foot traffic, within reach of the fish-rich coastal waters it feeds in. Sightings drop off sharply by late summer, when most of the population has moved back north toward breeding grounds off New England and Atlantic Canada.
A cold-water specialist pushing its range south
Grey seals breed on remote beaches and islands well north of New Jersey, but decades of legal protection have let the population rebound and expand its wintering range farther down the coast. What shows up on a Jersey Shore beach in January is typically a seal following schools of fish south for the cold months, hauling out to rest and warm up between feeding trips rather than settling in for good.
Status in New Jersey
NatureServe ranks the grey seal S4N, apparently secure as a nonbreeding visitor, and it’s native to New Jersey’s coastal waters.
