The Grand Hogback is a 70-mile long,[2] curving, spine-like ridge in Western Colorado that extends from near McClure Pass in Pitkin County through Garfield County and then to near Meeker in Rio Blanco County.

[3] The hogback is significant because it marks part of the boundary between the Colorado Plateau to the west and the Southern Rocky Mountains to the east.

The hogback appears as a series of serrated ridges and is easily discernable from Google Maps and other aerial views.

A monocline, the Grand Hogback is part of the Mesaverde Formation.

The ridge formed towards the end of the Laramide orogeny during the middle to late Eocene.