Mount Diablo, Contra Costa CA

• 4-star hikes • 8 to 11 mile options • Moderate & Hard | Gain 2,280 to 3,390 feet • Clayton, CA | San Francisco Region . The Mount Diablo Summit Museum on the mountain's peak. The morning fog blankets the valley below as we ascend, leaving behind the shrouded cities and emerging into brilliant sunshine. This phenomenon perfectly illustrates exactly why Mount Diablo remains a popular destination…