Castle Rocks State Park, located amidst pinyon trees on Smokey Mountain's slope in Cassia County, Idaho, boasts rock formations that date back 2.5 million years. This park holds a rich history, with historic trail crossings, 20th-century ranching, and even remnants of Native American pictographs. The challenging terrains of Castle Rocks draw thousands of rock climbers annually, while experienced hikers can enjoy panoramic views along the California National Historic Trail. The steep landscape is perfect for year-round mountain biking and offers cross-country skiing, snowshoeing, and ice-climbing opportunities during winter. Castle Rocks is also a great destination for family outings, with archery practice under the guidance of park rangers and fishing for Chinook, Salmon, Steelhead, or Trout for enthusiastic anglers. Click here for more details.