Mount Lyell (California)

Climbing

The standard route up Mount Lyell begins at Tuolumne Meadows, following a busy stretch of the John Muir Trail. From the Tuolumne Wilderness Office, the round trip covers about 25 miles and gains 4500 feet in elevation. The first part is easy, winding through the meadows and along the Tuolumne River to the head of Lyell Canyon, then gets moderately steeper as it approaches Donohue Pass. Just before that pass, the path leaves the trail and turns south toward the peak.

Most climbers tackle the summit by crossing or skirting the Lyell Glacier, but conditions on the ice shift with the seasons and from year to year, so checking the latest reports is essential before picking a route. The northwest ridge, accessed from the saddle between Mount Lyell and nearby Mount Maclure, works well when the glacier has deep snow; if snow levels are low, the climbing becomes class 3 to 4 on exposed granite ledges, and a more direct glacier ascent might be simpler.

The summit block is made of dark volcanic granite, like the neighboring peaks Rodgers Peak, Mount Davis, Banner Peak, and Mount Ritter. This rock is crumbly and unstable, making the final push to the summit plateau risky when the glacier is low and exposes the lower part of the block. Because of this, some climbers consider Mount Lyell and Mount Maclure to be part of the Ritter Range geologically. The east arete also gets harder with less snow, moving from class 3 to class 4, and the loose rock beneath the glacier there adds danger in low-snow conditions. Other routes exist on the south and west sides, but they are more difficult and require longer approaches.