Groundhog is one of the most frequently recorded mammals in New Jersey’s occurrence data, with 1,749 iNaturalist and GBIF records logged across the state, more than all but a handful of species tracked here. That volume traces back to how visible groundhogs are along New Jersey’s roadsides and field edges, not necessarily to how many actually live in any one spot.
Edges, not deep woods
Groundhogs dig burrows in open, well-drained ground, so they gravitate to field edges, hedgerows, and road cuts rather than deep, unbroken forest. In New Jersey that means they turn up along the farm valleys and pasture edges of the Highlands just as readily as in the sandy, well-drained soils of the Pine Barrens, where digging comes easy even under a canopy of pitch pine and scrub oak. The state’s dense northern and central corridor adds a third kind of edge: parks, reservations, and greenway strips backed by lawns and gardens.
A hibernator’s calendar
New Jersey’s records track the groundhog’s hibernation cycle closely. Counts stay low through January and February, when animals are underground, then climb fast in March and April as they emerge to feed on grasses, clover, and garden plants. Records hold high through summer and into September before dropping off again as animals fatten up and head back underground for winter.
Status in New Jersey
NatureServe ranks the groundhog S5, secure, in New Jersey, and USGS NAS doesn’t list it as nonindigenous here, so it’s treated as native across its New Jersey range.
