Based on 8,601 research-grade iNaturalist observations in New York, Eastern Chipmunk is most often recorded in May; in New York it behaves like a summer visitor / breeder. It ranks #4 among mammals recorded in the state in our data.
Tamias striatus
Eastern Chipmunk in New York 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 York in May

Eastern Gray Squirrel

White-tailed Deer

Eastern Cottontail

Groundhog

Common Raccoon
American Beaver
Red Fox

American Red Squirrel
Places to look in New York
New York Botanical Garden
Botanical GardenBrooklyn Botanic Garden
Adirondack Park
Queens Botanical Garden
Franklin D. Roosevelt Four Freedoms Park
Planting Fields Arboretum State Historic Park
FAQ
When does Eastern Chipmunk appear in New York?
Mainly April–October, with the most records in May.
How common is Eastern Chipmunk in New York?
It ranks #4 by number of iNaturalist observations among mammals in New York (8,601 records in our sample).