With 5,952 records, the eastern chipmunk is one of the most thoroughly documented mammals in Pennsylvania, reported from nearly every corner of the state. Allegheny, Centre, and Montgomery counties lead, and wooded parks from Ricketts Glen to Ridley Creek turn up animals wherever trails pass stone walls, stumps, and leaf litter.
A hoarder with a floor plan
Chipmunks live by the cache. Each animal excavates a burrow system with a nesting chamber and storage pockets, then spends autumn stuffing its cheek pouches with acorns, hickory nuts, and seeds to fill them. The September surge in Pennsylvania’s records, more than a thousand in that month alone, matches that frantic gathering season, when a chipmunk may shuttle between a fruiting oak and its burrow entrance all day long.
Underground, but not quite asleep
Unlike the groundhog, the chipmunk is not a true hibernator. It retreats below the frost line and slips into torpor, waking every few days to eat from its hoard, which is why records nearly vanish from December through February without stopping altogether. By May and June the animals are back at the surface in force, females are nursing litters underground, and the state’s counts hit their yearly peak.
Status in Pennsylvania
NatureServe ranks the eastern chipmunk S5, Secure, in Pennsylvania. The species is native to the state, and USGS NAS does not list it as nonindigenous here.
