Tunxis State Forest is a state forest located in the towns of Hartland, Barkhamsted, and Granby in Connecticut, United States.

The forest surrounds Barkhamsted Reservoir and borders the Granville State Forest in Massachusetts.

[3] The forest is used for hiking, mountain biking, cross-country skiing, fishing, hunting, and letterboxing.

Several trails cross the forest, including the northern end of the blue-blazed Tunxis Trail.

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