The 31-mile Bangtail Divide loop is Montana’s go-to for epic mountain scenery. Start at Stone Creek trailhead outside of Bozeman and be ready for the long haul. You’ll switchback up Stone Creek to Grassy Mountain, which tops out in smooth singletrack and then vertically climbs another two miles. Then just after mile 18, a five-mile downhill section whips you through pine forest, making all the sweating (and maybe swearing) worth it. The trail ends at Brackett Creek, but an easy eight miles along Highway 86 dumps you back at Stone Creek, where you'll be happily reunited with your car.