The Guanella Pass Scenic Byway is a National Forest Scenic Byway and Colorado Scenic and Historic Byway located in Clear Creek and Park counties, Colorado, USA. The byway traverses Guanella Pass at elevation 11,670 feet (3,557 m) in Arapaho and Pike national forests. The pass lies above timberline surrounded by Grays Peak at elevation 14,278 feet (4,352 m), Torreys Peak 14,275 feet (4,351 m), Mount Evans 14,271 feet (4,350 m), and Mount Bierstadt 14,065 feet (4,287 m). The byway passes through the Georgetown–Silver Plume Historic District, and provides access to the Georgetown Loop Historic Mining & Railroad Park and the Georgetown Loop Railroad. The byway is renowned for its spectacular autumn colors during aspen color change from September 10 through October 10 each year.