Dunraven Pass–Mount Washburn Trail

This is the south-side out-and-back to Mount Washburn’s 10,219-foot summit. The mapped route is about 7 miles round trip, with roughly 1,400 feet of climbing; allow four to five hours with a stop at the top. Park information still gives 6 miles, but the connected trail line measures about 3.5 miles each way and detailed route accounts agree with the longer figure, so 7 miles is the safer plan. You return by the same trail. I’d pick this side if you want a hiking path through alpine slopes; the separate Chittenden Road route follows a broader, more gradual road to the same summit.

The trail climbs steadily from about 8,900 feet to more than 10,000 feet. Some descriptions call the climb moderate and others strenuous; I’d plan for the hard end because it starts near 8,900 feet and keeps climbing above treeline. The upper slopes are open and exposed to lightning, and there’s no water along the route. Grizzlies frequent this area in fall; park guidance advises against hiking here in September and October. Give the climb a clear-weather day and don’t count on a quick summit stop.

Begin at the Dunraven Pass parking lot on Grand Loop Road. There’s a vault toilet in the middle of the lot, but parking can be tight on peak summer days. The high pass is a seasonal drive and closes to regular traffic when winter weather sets in, so check road status before making the trip. Pets aren’t allowed on the trail.

The trail starts in lodgepole pine, then south-facing views open within the first tenth of a mile. The summit lookout comes into view after the first switchback, which gives you a useful target for the climb. In July, wildflowers cover the slopes; the earliest open stretch is especially good for seeing them without leaving the trail.

The path works up the mountainside through a series of switchbacks and alpine vegetation. Stay on the tread: the plants are fragile, and the open ridge has little shelter from a sudden storm. Near the top, this southern route joins the approach from Chittenden Road for the final few tenths of a mile. The view gets wider as the trees fall away, with the Grand Canyon of the Yellowstone and Avalanche Peak to the south.

At the summit, the fire lookout’s shelter has interpretive panels at its base. This is one of Yellowstone’s three fire lookout stations, staffed by firefighters through the summer fire season. On a clear day, the park estimates views stretching 20 to 50 miles. Take a moment to look back down the ridge you climbed; it makes the route’s switchbacks and the pass below easy to pick out.

Mount Washburn is the northern remnant of an extinct Absaroka volcano about 50 million years old. The Yellowstone caldera-forming eruption 631,000 years ago cut the volcano in half; this mountain is the part that remains visible. You’re climbing an older volcanic landscape inside a much younger caldera story.

Bighorn sheep are often seen near Dunraven Pass, and July is the showiest month for flowers on the slopes. If you spot a ram, its horn rings can indicate age. The thickened, layered bone in a ram’s skull helps absorb the impact of head-on contests, a useful bit of context for watching them from a distance.