The Mount Thielsen Trail leads through lodgepole pine for the first mile with timberline at approximately 7200 feet elevation. The mountain hemlock-true fir type is predominant along the trail. Inviting glimpses of Mt. Thielsen are evident as one progresses and a breath taking view of Mt. Thielsen presents itself just beyond the Spruce Ridge Trail junction at 1.6 miles.

As the Pacific Crest National Scenic Trail is reached at 2.9 miles, the glacial features of this volcanic peak loom before you. From the Pacific Crest National Scenic Trail, a scramble trail works its way to the spire pointed peak at 9,182 feet elevation. The trail is a steep climb, particularly above timberline beyond which there are no markers. The last 200 feet is a difficult hand-over-hand climb. Elevation gain is 3,782 feet.

Hiking boots and caution are highly recommended for climbing on the loose rocky slopes. Those brave and energetic enough to make it to the top should add their names to the climbing register found there. The view of the east and west sides of the Cascades, from the Sisters to Mt. Shasta, is incredible.

This trail is used in the winter time by Nordic skiers up to the Pacific Crest National Scenic Trail.

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