The peak and northern part of the mountain are located within Massachusetts, while the southern slope of Mount Frissell is located within Connecticut and rises to the highest elevation within that state, . The high-point marker for Connecticut is on the border with Massachusetts at . Bear Mountain, located to the east-southeast, has the highest mountain summit in Connecticut. Most hikers reach the state high point by a rather short route starting high up in the col between Mt. Frissell and Bear Mountain, at an elevation of around .