Hike Half Dome on a Guide Yosemite Half Dome Trek YExplore Half Dome Summit Club by John P. DeGrazio. Hike Half Dome and attempt the 8842′ Summit with the most experienced Yosemite Guide Service rated highest in customer satisfaction. Half Dome Cables. The most famous–or infamous–part of the hike is the ascent up the cables. The two metal cables allow hikers to climb the last 400 feet to the summit…