Almost every eastern chipmunk record in Delaware comes from the state’s small sliver of Piedmont in the north, the rocky, wooded hills along the Brandywine and White Clay Creek near Wilmington and at First State National Historical Park. That’s a narrow slice of Delaware’s overall terrain, since most of the state flattens into Coastal Plain farmland and marsh farther south, and it says something about where this ground squirrel actually finds the loose, rocky soil and mature hardwoods it needs for denning.
Cheek pouches and a burrow built for storage
The eastern chipmunk carries food home in stretchy cheek pouches rather than eating on the spot, then packs it into an underground burrow system with separate chambers for nesting, storage, and waste. It forages by day for acorns, hickory nuts, and seeds, and gives a sharp, repeated alarm call from cover the moment it senses a hawk or fox nearby. Unlike a true hibernator, it doesn’t sleep straight through winter. It dozes in bouts underground and wakes periodically to eat from its cached stores.
From empty winter records to a June surge
Delaware’s records drop to zero in January and stay thin through late winter, then climb fast, peaking in June. That pattern lines up with chipmunks emerging from their winter burrows and becoming active above ground again for feeding and breeding through spring. It’s a records pattern shaped by when the animal is out and visible, not a sign that more chipmunks exist in June than in December.
Status in Delaware
NatureServe ranks the eastern chipmunk S5, secure, and it’s native throughout the state. Its numbers likely track the health of Delaware’s remaining hardwood cover, especially in the Piedmont hills where records concentrate.
