Pinnacle Hill is the highest point in Rochester, reaching 749 feet above sea level (or 506 feet above the city's lowest point at Lake Ontario). Originally referred to as Mount Monroe (in an 1829 deed), but by 1838, it was known as Pinnacle Hill. It is one of a range of four hills (originally five) collectively termed "the Pinnacle Hills" that runs along the city's southern and southeastern boundary. The four hills are Cobbs Hill, Pinnacle Hill, Highland Hill (in Highland Park) and Mount Hope (in Mount Hope Cemetery). The fifth hill, Oak Hill, was leveled for the construction of the original Oak Hill Country Club, which later became the River Campus of the University of Rochester.
In 1838, St. Patrick's Cemetery opened on the hill's western slope. By 1871, the cemetery had filled and the Roman Catholic Bishop of Rochester, Bishop McQuaid, urged families to remove the remains of their relatives and re-inter them at Holy Sepulchre Cemetery. The last remains were not removed until the 1930s.
Pinnacle Hill's elevation is augmented by five broadcast towers. While virtually the entire hill is privately owned, there is a network of trails accessible from Field Street just off of Clinton Avenue. There are some excellent views from the Southern flank of the summit.
The broadcast towers atop the hill are the source of almost all of the over-the-air television service in the city, as well as a good portion (I dare say majority) of the FM radio transmissions. In 2004, the National Radio Club's convention was held in Batavia and a day trip to Pinnacle Hill was undertaken — see this page between "Pinnacle Hill gate" and "WXXI/WUHF, WOKR towers" for the pictures.
Pinnacle Hill May have had the last remaining peak of the Pinnacle Range. However, it is now gratuitously flattened and houses 2 fire pits with large sitting areas. Pinnacle Hill is different from Cobb’s Hill in that it is primarily used by mountain bikers more than dog-walkers. A significant portion of the hill is bike track. The trails and its stunt accessories are maintained by bikers. Trees along the trails are prone to being hacked to make more room, like the lone dead American elm near the peak that was perhaps the last of its kind in the Rochester area. Pinnacle Hill is also unique in that it retains some understory because its steep peaks are seldom accessed by deer. This includes witch-hazel, roundleaf dogwood and false Solomon’s-seal, but not the white trillium in Washington Grove. Dark-eyed junco, winter wren and eastern wood-pewee breed in its woods, but it has fewer wood thrush than Washington Grove. In April migration, it hosts sapsucker, flickers, hermit thrush, brown creeper and fox sparrows; May migration has not yet been recorded. Mourning cloaks and eastern commas bask on its peak in June. Turkey Vultures may be seen on the radio towers. Pinnacle Hill suffers from invasive species, such as periwinkle, garlic mustard and Osage orange, and it is still under threat from bikers. It has historically largely fended off development into suburban subdivisions with help from the Sierra Club.
Pinnacle Hill was a significant landmark for the Seneca, much of whom are dead. Most of its pre-colonization usage is lost to history.