There are six separate mountain ranges within the forest including the Gallatin, Madison, Bridger, Crazy, Absaroka, and Beartooth Ranges. The Beartooth's are home to Granite Peak, which at , is the highest point in Montana and also in the forest. Quake Lake on the Madison River is the site of the 1959 earthquake and landslide which formed the lake. A separate section of the forest north of Livingston, Montana is located in the Crazy Mountains which rise over above the great plains to the east. The forest includes two wilderness areas, the Absaroka–Beartooth () and the Lee Metcalf ().