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Truman Trail - Pumice Plains

South Cascades


South Cascades -- Mount St. Helens
View map below


10.0 miles, roundtrip


Gain: 1425 ft.
Highest Point: 4200 ft.


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WTA worked here: 2019

Parking Pass/Entry Fee

Northwest Forest Pass

Get up close and personal with Mount St. Helens as you explore the northern flanks of the eruption site and meander through the unique ecology of the pumice plains.

The Truman Trail can be started at either end — by parking at the Windy Pass trailhead and heading west, or by parking at the Johnston Ridge Observatory and heading east past the Boundary Trail (though this itinerary will add a few more miles to your total).

Either way, your journey will take you through some of the most otherworldly scenery in all of Washington State.

After nearly four decades, the pumice plains are now teeming with life. It’s not unlikely that you’ll catch sight of mountain goats, elk and songbirds as you meander up and down the gentle moss-covered hills. From the north, you’ll welcome views of Spirit Lake and the Mount Margaret backcountry, while unobstructed views of Mount St. Helens encompass the south. If you look closely, you can spot a few research stations set up around the valley, too.

Note: Overnight camping is not allowed along the Truman Trail due to recovery efforts.


Truman Trail - Pumice Plains

Map & Directions

Co-ordinates: 46.2499, -122.1362 Open map in new window


South Cascades -- Mount St. Helens

Truman (#207)

Gifford Pinchot National Forest, Mount Adams Ranger District

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Getting There

Starting at the town of Randle, drive south on Forest Road 25 past Iron Creek Falls to a junction with FR 99. At this junction, turn right onto FR 99. You will drive to the end of the road where the Windy Ridge trailhead is located.

Parking Pass/Entry Fee

Northwest Forest Pass

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Truman Trail - Pumice Plains

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