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Lost Horse is a fun bouldering area, as well as a handful of crack climbs. It is near Missoula and can keep a climber busy for a while!
Drive ten miles south of Hamilton and take a right on Lost Horse Road, follow the road past Lost Horse Resort and park per area from there at one of several pullouts.
There is a good online guide to be located at bitterrootbeta.org put together by Ryan Bressler.