Directions: From E. Main St. downtown, turn left on Rouse Ave. and continue until it turns into Bridger Dr/Hwy. 86. Drive 14 miles northeast and turn right at the trailhead for Bangtail Divide. Trail begins after small footbridge crossing. Grassy Mountain can also be accessed from the gravel road on the right side of Hwy. 86 about 1/2 mile prior to Bangtail but it's about a four-mile uphill climb on the gravel road to the meadow crossing, after which you get to the single-track. Then it's downhill all the way, seven miles or so back to the Bangtail trailhead.
Trail Information: Well-maintained single-track switchbacks climbing up through the Bangtails. Trail winds up through thick forest and overlooks beautiful meadows blazing with alpine wildflowers -- run up far enough and you're rewarded with amazing views of the Bridgers. One of the best trails in Bozeman.
Miscellaneous Information: Wildly popular mountain-biking trail -- but wear a bear bell if you're running by yourself or you're running late in the day.