Based on 2,636 research-grade iNaturalist observations in New Jersey, Groundhog is most often recorded in September; in New Jersey it behaves like a summer visitor / breeder. It ranks #5 among mammals recorded in the state in our data.
Marmota monax
Groundhog in New Jersey by month
Bars show research-grade observations per month. They mix true seasonality with how often people are outdoors, so treat small numbers with caution.
Also seen in New Jersey in September
Eastern Gray Squirrel
White-tailed Deer
Eastern Chipmunk
Eastern Cottontail
Red Fox
Common Raccoon
Northern Short-tailed Shrew
American Black Bear
Places to look in New Jersey
Botanical GardenDrew University
State ParkLiberty State Park
Botanical GardenWillowwood Arboretum
Botanical GardenHerrontown Woods Arboretum
State ParkWawayanda State Park
State ParkIsland Beach State Park
FAQ
When does Groundhog appear in New Jersey?
Mainly April–October, with the most records in September.
How common is Groundhog in New Jersey?
It ranks #5 by number of iNaturalist observations among mammals in New Jersey (2,636 records in our sample).