11 Most Difficult Mountains to Climb in US

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10. Dallas Peak, Sneffels Range, East Ridge Route

Location: Colorado 

Altitude: 13,809 feet

Elevation gain: 4,500 feet

Time required: 1 day

It’s open all year round, but you know better than to go climbing whenever you think of it. Navigation and technical rock climbing are all you need for it. However, because of its summit tower, Dallas Peak is considered the hardest peak above 13,113 feet in Colorado to climb.

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