Tarryall Creek is a tributary of the South Platte River, approximately 68.5 miles (110.2 km) long, in Park County in central Colorado in the United States. It drains a rural portion of north and central South Park, an intermontane grassland in the Rocky Mountains southwest of Denver. It rises in the high Rockies in several forks along the Continental Divide in the Pike National Forest southwest of Boreas Pass. It descends to the southwest through a short canyon, emerging into South Park near Como, Colorado. It crosses U.S.