State Highway 318 is a highway in Moffat County, Colorado.

SH 318 runs 60.7 miles (97.7 km), starting north of the Green River in an isolated area known as Browns Park. It connects at the Utah state line with gravel surfaced Brown's Park Road. The highway runs southeast, passing Browns Park National Wildlife Refuge and continuing southeast when the Green River turns south into Dinosaur National Monument. The highway crosses Vermillion Creek, the Little Snake River and the Yampa River before ending at a junction with US 40 in Maybell.

The entire route is in Moffat County.