You can drive part way to the site, then hike the remainder in summer or ski it in winter. In the valley are 2,000-year-old bristlecone pine trees. Established in 1964 by the USDA Forest Service, the Bristlecone Pine Scenic Area protects an unusual stand of wind-sculpted bristlecone pine trees. Growing at 11,700 feet, some trees are over a thousand years old. Accessible only during the summer months.You can drive part way to the site, then hike the remainder in summer or ski it in winter. In the valley are 2,000-year-old bristlecone pine trees. Established in 1964 by the USDA Forest Service, the Bristlecone Pine Scenic Area protects an unusual stand of wind-sculpted bristlecone pine trees. Growing at 11,700 feet, some trees are over a thousand years old. Accessible only during the summer months.