Boulder Mountain Pass is a high mountain pass at an elevation of 2.928m (9,606ft) above the sea level, located in Garfield County, in southern Utah, USA.
The road to the summit is paved but pretty steep with some parts up to 8%. It’s called State Route 12. It was built in the 1920’s. The pass is the highest point of the road. The road is open year-round, but after major winter storms, sections might be impassible until plowed. Cell phones do not work along many miles of Scenic Byway 12 due to the rugged terrain and remoteness. Many segments of Scenic Byway 12 have sharp curves and narrow to no paved shoulders.