Ptarmigan Trail is the gateway to some of the most iconic terrain on Mount St. Helens. Beginning at Climbers Bivouac on the volcano’s south side, this trail climbs steadily through second-growth forest and small meadows before reaching timberline and the junction with the Loowit Trail. For many visitors, it is the first leg of the summer Monitor Ridge summit route, but it also works beautifully as a standalone hike for those who want a strong taste of the mountain without committing to the full climb.
What makes Ptarmigan Trail special is the transition it delivers in a relatively short distance. The route begins in cool forest, gradually opens into meadows, and then climbs toward broader volcanic views as you near the 4,800-foot level. The Forest Service says the trail reaches the Loowit junction in about 2 miles, while the broader Monitor Ridge route description notes Ptarmigan climbs about 1,100 feet in roughly 2 1/4 miles to timberline. That makes this a great option for hikers looking for a moderate uphill outing with a real sense of climbing into Mount St. Helens country.
Ptarmigan Trail is also an important dividing line for trip planning. Up to the Loowit Trail junction, this can be enjoyed as a day hike. Beyond 4,800 feet, travelers are entering the climbing zone for Monitor Ridge, where Mount St. Helens climbing permits are required year-round. Above timberline, the terrain becomes much steeper and more demanding, with lava flows, loose pumice, ash, and exposed upper mountain conditions.
Visitors should plan ahead for a more primitive trailhead experience. Climbers Bivouac has pit toilets, limited parking, primitive tent pads, and no potable water. A day-use pass is required for parking unless you are displaying a valid climbing permit for the date of your climb.
Trail details: Ptarmigan Trail #216A begins at Climbers Bivouac, near Cougar, Washington. Trailhead coordinates are 46.146695, -122.181703, and the trailhead elevation is about 3,736 feet. The Loowit Trail junction is reached in about 2 miles.
Getting there: From Cougar, take Lewis River Road / Forest Road 90 east for 6.4 miles, turn left onto Forest Road 83, continue about 3 miles, stay left onto Forest Road 81, then go about 1 mile to Forest Spur Road 830. Turn right and continue about 0.4 miles to Climbers Bivouac.
Call to action: Add Ptarmigan Trail to your Visit Mt. St. Helens itinerary for a rewarding uphill hike through forest and meadow to the edge of the volcano’s high country. It is one of the best ways to experience the south side of the mountain, whether you are heading for Loowit or simply enjoying the climb to timberline.
Current seasonal note: South-side vehicle access is still limited. The Forest Service says Forest Road 83 is closed and gated at Marble Mountain Sno-Park for winter conditions, and the Climbers Bivouac trailhead remains listed as temporarily closed, with the road snow-covered and impassable by most vehicles. If the summer trailhead is still closed, summit climbers are directed to use the Worm Flows winter route instead.