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Mountain Ash Creek is a walk-in backcountry campsite located along the Mountain Ash Creek Trail in the Cascade Corner region of Yellowstone National Park. The trail is an 11.6-mile route that begins just south of Yellowstone at the Grassy Lake Reservoir dam base and provides access to Union Falls. This designated backcountry site is one of several campsites (9U1-9U5) along the trail corridor. A backcountry permit is required for overnight stays. The area provides access to some of Yellowstone's most impressive waterfalls.
Open Jul through Sep
Mountain Ash Creek Trail is an 11.6-mile trail that begins just south of Yellowstone at the base of the Grassy Lake Reservoir dam. Campsites 9U1-9U5 located along the trail.
A backcountry permit is mandatory year-round for all overnight stays.
Campsites 9U1-9U5 designated along Mountain Ash Creek: 9U1 Falls River Cutoff, 9U2 Mountain Ash Creek, 9U3 Mountain Ash Creek Ford, 9U4 Union Falls, and 9U5 Warm Fork. Backcountry campsites require reservation and permit.
Mountain Ash Creek Trail penetrates Yellowstone's Cascade Corner with access to a number of impressive waterfalls.
Timing your trip from mid-August through September is usually a good window. The Falls River ford should not be tried before mid-July.
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