Bighorn Pass Trail

Bighorn Pass Trail is a 19.4-mile one-way traverse across the Gallatin Range, from Bighorn Pass Trailhead (WK6) on US 191 to the Indian Creek side near Mammoth–Norris Road. It is a strenuous, mostly full-day backcountry hike; allow about 10 hours on foot and expect roughly 2,100–2,500 feet of climbing. The endpoints are far apart by road, so stage a second vehicle or arrange a shuttle and leave time for the drive. The 21.2-mile WK6 option turns around at Bighorn Pass and retraces the approach; this route continues across the range.

Across the crossing, the trail moves between riparian meadows, lodgepole pine and mixed conifer forest, then opens into broad alpine country. On the Indian Creek side, it follows willow meadows for about two miles, crosses Indian Creek, climbs a low ridge, drops to Panther Creek and crosses that stream before continuing through pine, spruce and fir. The final two miles from Indian Creek toward Bighorn Pass climb about 1,100 feet. From the pass, the westward view runs down the Gallatin River Valley; leave time for it before committing to the long descent.

Moose and elk may feed in the Indian Creek willows in the morning or evening. Near the pass, scan the slopes of Bannock Peak and Quadrant Mountain for bighorn sheep. The pass itself is the route’s signature view: frame the open saddle with the Gallatin River Valley beyond it.

This route crosses the Gallatin Bear Management Area. From May 1 through November 10, off-trail travel is prohibited, and groups of four or more are recommended. Grizzlies frequent the area, so carry bear spray where you can reach it. Pets are not allowed. Overnight camping requires a backcountry permit. The last two miles near the pass include high avalanche-risk terrain in winter. A shorter alternative from WK6 follows the Fawn Pass–Bighorn Pass cutoff and returns in about eight miles.