U.S. Route 34 (US 34) is an east–west United States highway that runs for 1,122 miles (1,806 km) from north-central Colorado to the western suburbs of Chicago. Through Rocky Mountain National Park it is known as the Trail Ridge Road where it reaches elevation 12,183 feet (3,713 m), making one of the highest paved through highways in the United States. The highway's western terminus is Granby, Colorado at US 40. Its eastern terminus is in Berwyn, Illinois at Illinois Route 43 and Historic US 66.

The Town of Granby is the Statutory Town that is the most populous municipality in Grand County, Colorado, United States. The town population was 2,079 at the 2020 United States Census. Granby is situated along U.S. Highway 40 in the Middle Park basin, and it is about 85 miles (137 km) northwest of Denver and 14 miles (23 km) southwest of Rocky Mountain National Park.