5. Mount Shasta, Hotlum-Bolam Ridge
Location: California
Altitude: 14,162 feet
Elevation gain: 7,200 feet
Time required: 1-2 days
Mount Shasta ranks 5th on our list of most difficult mountains to climb in US. It is the second highest peak in Northern California’s Cascade Range. There are a lot of challenges, and some say that Mount Shasta’s Hotlum Glacier is the perfect preparation for climbing the difficult summits down below.