Ascent of Cosho Peak on 2018-08-16

Climber: Jake Robinson

Date:Thursday, August 16, 2018
Ascent Type:Successful Summit Attained
Peak:Cosho Peak
    Elevation:8332 ft / 2539 m

Ascent Trip Report

Trace and I decided to do Kimtah and Cosho by dropping all the way down to Cosho Camp then reascending to the Cosho-Thieves col rather than doing the sidehill traverse. In retrospect, I'm not sure if this is any less effort than the traverse...

For this trip we followed beta from Fay Pullen's 2005 trip:

and Fletcher's 2017 trip:

Both are excellent.

This late in the year we had a hunch that there'd be no water on route, so we carried 3L each. We were right. Be aware of this and either carry enough water or be prepared to melt snow from the Kimtah Glacier.

From Cosho Camp (actually about a mile farther west than it is marked on the old USGS map), we continued west for a few minutes until reaching a wash, then proceeded more or less directly uphill. The idea was to parallel the large central gully on the south side of Cosho just to the east, avoiding the alder that chokes the lower part of that gully. The woods started out open then got a little brushy, but were still much preferable to alder. At 5100' we reached some cliffs that forced us left, where we thrashed through some brush into the gully. The next 1000' or so up the gully is fun scrambling on good white rock with many interesting class 3/4 steps. One particularly tricky step at 5400' gave us pause, especially on the way down. When the gully opens up the terrain gets worse and worse, and the last 1000' is unpleasant hard-packed dirt, scree, and loose talus. Fun stuff.

After Kimtah, we took a break at the Cosho-Thieves col then made the quick scramble up Cosho. We just followed rock in a straight shot directly from the col to the summit. It was a short initial class 4 step followed by class 2/3 to the summit.
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