Photos of Trail Ridge Road in the Rocky Mountain National Park. These photographs were taken on September 23, 2011. This is one of the most spectacular passes in Colorado. It stretches from Granby to Estes Park. The altitude ranges from 7,500 to 14,259 feet slices through montane, sub-alpine and alpine zones. A drive up Trail Ridge Road takes you to the Arctic Circle ecologically. The Continental Divide splits the Park into east and west sides.