6 Longs Peak in Rocky Mountain National Park Colorado shutterstock240904369.jpg

Shutterstock

Longs Peak is the highest in Rocky Mountain National Park, which makes it a favorite target of less experienced climbers. The Keyhole Route is the most popular, beginning from a campground at 9,405 feet and gaining 4,850 feet to the summit.  The best time to go is late summer, as winter conditions are common at any other time. With steep scrambles and even more technical options for experienced climbers, this one’s an American classic.