The southernmost peaks of the range are in the northwestern section of Yellowstone National Park, however the majority of the range is in Gallatin National Forest. The Yellowstone River flows north on the eastern flank of the range. The Madison Range parallels the Gallatins to the west. The northern end of the range is near Livingston, Montana and Bozeman Pass separates the Gallatins from the Bridger Mountains to the north.