[1] Spanning parts of the towns of Putnam Valley, Kent, and Carmel, most of the park is situated in northern Putnam County between the Taconic State Parkway and U.S. Route 9.

The park was created through a donation of about 2,400 acres (9.7 km2) in 1929 by Dr. Ernest Fahnestock as a memorial to his brother Clarence, who died in the post-World War I influenza epidemic treating patients with the disease.

Clarence Fahnestock State Park includes a lake (Canopus), a pond (Pelton), a beach, picnic tables with pavilions, a playground, recreation programs, a nature trail, hiking and biking, a bridle path, seasonal turkey and deer hunting, fishing and ice fishing, a campground with tent and trailer sites, a boat launch with boat rentals, and a food concession.

The winter park offers sledding (tube only), cross-country skiing, snowshoeing, recreation programs and a nature trail.

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