Trout Creek Pass, elevation , is a mountain pass located in the Rocky Mountains of south-central Colorado in the United States. The pass sits atop the southern end of the Mosquito Range on the Park-Chaffee county line, between South Park (the headwaters of the South Platte River to the east) and the headwaters of the Arkansas River to the west. It is traversed jointly by U.S. Highway 24 (US 24) (between Hartsel and Buena Vista) and US 285 (between Fairplay and Buena Vista). It is passable by most motorized vehicles and is closed only during severe winter storms. The approach from the north is mild, while the south side has a moderate 5% grade.