Roughly 1 mile (1.6 km) in diameter, Rattlesnake Mountain rises steeply 500 feet (150 m) above the Farmington River valley to the west.
The mountain consists of an upper summit cone that descends into a series of tiered ridges which become contiguous with the Metacomet Ridge on Pinnacle Rock to the south and Farmington Mountain to the north.

A small traprock quarry, 0.4 miles (600 m) wide, occupies the northeast side of the mountain, and a suburban development the southwest side.
Three broadcasting towers (WTIC-TV, WHPX-TV and WVIT-TV) stand on the summit.

The east side of Rattlesnake Mountain drains into Trout Brook, then to the Park River, thence into the Connecticut River and Long Island Sound; the west side into the Pequabuck River, then to the Farmington River, thence to the Connecticut River.
The south side of the mountain supports the headwaters of the Quinnipiac River, which flows directly into Long Island Sound.
Roughly 1 mile (1.6 km) in diameter, Rattlesnake Mountain rises steeply 500 feet (150 m) above the Farmington River valley to the west. The mountain consists of an upper summit cone that descends into a series of tiered ridges which become contiguous with the Metacomet Ridge on Pinnacle Rock to the south and Farmington Mountain to the north. 
A small traprock quarry, 0.4 miles (600 m) wide, occupies the northeast side of the mountain, and a suburban development the southwest side. Three broadcasting towers (WTIC-TV, WHPX-TV and WVIT-TV) stand on the summit.
The east side of Rattlesnake Mountain drains into Trout Brook, then to the Park River, thence into the Connecticut River and Long Island Sound; the west side into the Pequabuck River, then to the Farmington River, thence to the Connecticut River. The south side of the mountain supports the headwaters of the Quinnipiac River, which flows directly into Long Island Sound.
Rattlesnake Mountain (Connecticut)