Indian Joe, Cave Rocks, High Valley, and Flag Hill Loop

This challenging and scenic loop is located within the Sunol Regional Wilderness in California. The trailhead is typically accessed from the main entrance of the wilderness area.

The trail offers a diverse mix of terrain. You'll encounter shaded paths, open ridgelines, and rocky outcrops, particularly at Cave Rocks. The climb up Flag Hill involves very steep singletrack sections, and some parts of the Indian Joe Creek Trail may require crisscrossing creek beds. Be aware that sections can be steep and slippery after rain.

Yes, as the trail is located within the Sunol Regional Wilderness, there is typically an entrance fee per vehicle. You should check the official East Bay Regional Park District website for the most current fee information and any specific permit requirements, especially for activities like camping.

Dogs are generally allowed on trails within the Sunol Regional Wilderness, but they must be kept on a leash. Always check the latest park regulations before your visit, as rules can change.

Spring is an excellent time to visit, as the trail is adorned with wildflowers. However, the trail can be hiked year-round. Be mindful that sections can become steep and slippery after rain, so consider drier periods or prepare for muddy conditions if hiking in wet weather.

The loop offers rewarding and diverse scenery. From Flag Hill and other vantage points, you can enjoy panoramic vistas of the surrounding Sunol Wilderness mountains, Calaveras Reservoir, the Alameda Creek watershed, the Ohlone Range, Mount Diablo, and even the San Francisco Bay. You'll also pass through wooded canyons and open meadows.

Key features include the impressive basaltic outcrops of Indian Joe Cave Rocks, the serene High Valley meadow with its old barn, and the summit of Flag Hill offering breathtaking panoramic views. The trail also passes through Little Yosemite, a scenic gorge on Alameda Creek known for its rapids and granite rock formations.

The Sunol Regional Wilderness is home to diverse wildlife. You might spot grazing cows, deer, and various bird species. Less common but possible sightings include bobcats, mountain lions, raccoons, and coyotes.

Yes, this route utilizes several official trails within the wilderness area. You will hike sections of the Ohlone Wilderness Trail, Indian Joe Creek Trail, Flag Hill Trail, Flag Hill Road, and Cave Rocks Road as part of the loop.

This loop is generally considered to be of moderate difficulty. The climb up Flag Hill is particularly strenuous, involving a significant ascent over a relatively short distance. While not extreme, it's a good workout and might be challenging for absolute beginners. Hikers should have a reasonable level of fitness.

Given the varied terrain and strenuous sections, bring plenty of water, sturdy hiking boots, sun protection (hat, sunscreen), and layers of clothing. Trekking poles can be helpful for the steep ascents and descents, especially on Flag Hill. Always carry a map or GPS device, as cell service can be spotty.