Great Blue Hill is the highest point in the Blue Hills Reservation. The hill is named for the bluish hue of its exposed granite slopes, which offer panoramic views of the Boston skyline and the surrounding landscape. The hill is also home to the Blue Hill Observatory, the oldest continuously operating weather station in the United States. The observatory was founded in 1885 by Abbott Lawrence Rotch, a Harvard meteorologist who wanted to study the atmospheric conditions at high altitudes. The observatory is still active today, conducting research and education programs on climate change and weather phenomena. Great Blue Hill is a popular destination for hikers, bikers, and nature lovers.

Located only minutes from the bustle of downtown Boston, the Blue Hills Reservation stretches over 7,000 acres from Quincy to Dedham, Milton to Randolph, providing a green oasis in an urban environment. Rising above the horizon, Great Blue Hill reaches a height of 635 feet, the highest of the 22 hills in the Blue Hills chain. From the rocky summit, visitors can see over the entire metropolitan area. With its scenic views, varied terrain, and 125 miles of trails, the Blue Hills Reservation offers year-round enjoyment for the outdoor enthusiast.