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The mountain is a steep Class 3 climb.
Needles and Grenadiers explorer William S. Cooper climbed Mount Richthofen by himself in 1908 in what is presumed to be the first ascent in historic times by Americans of European descent. No sign of previous climbers were present at that time.
Check out the Official Route.
This is a difficult hike. Arrive fit and prepared or this could get ugly.
WARNING! Hiking and outdoor related sports can be dangerous. Be responsible and prepare for the trip. Study the area you are entering and plan accordingly. Dress for the current and unexpected weather changes. Take plenty of water. Never go alone. Make an itinerary with your plan(s), route(s), destination(s) and expected return time. Give your itinerary to trusted family and/or friends.