Canyon View, McCorkle, Eagle View, and Flag Hill Loop

This loop is considered moderate in difficulty, primarily due to significant elevation changes and steep climbs, especially on Flag Hill and Eagle View trails. A good level of fitness is recommended.

The terrain is quite diverse. You'll experience steep ascents on trails like Flag Hill and Eagle View, which can be sparsely shaded. Other sections, like McCorkle, feature gentler slopes through grasslands. The route transitions from shaded woodlands along creeks to exposed ridge lines.

The best time to hike this loop is during spring. Temperatures are milder, wildflowers are abundant, and creeks are flowing. Summers can be extremely hot and exposed, making for a much more strenuous experience.

The loop offers expansive panoramic views. From McCorkle and towards Cerro Este Overlook, you can see Calaveras Reservoir, Mount Diablo, and Maguire Peaks. Flag Hill provides breathtaking vistas over the valley and westward towards the bay. The Eagle View Trail lives up to its name with splendid views of the Sunol Wilderness valley and the reservoir. You'll also pass along Vista Grande Road.

Parking is available within the Sunol Regional Wilderness. It's advisable to arrive early, especially on weekends, as parking lots can fill up quickly.

Yes, there is typically an entrance fee for vehicles at Sunol Regional Wilderness. Check the official East Bay Regional Park District website for current fees and any specific permit requirements for certain activities.

The Sunol Regional Wilderness generally allows dogs, but they must be kept on a leash. Always check the park's specific regulations before your visit, as rules can vary or change.

Beyond the scenic beauty, the area is home to various wildlife. Hikers might spot goldfinches and woodpeckers. You may also encounter free-grazing cows in parts of the park. The Eagle View Trail is aptly named, as updrafts along the ridge attract raptors.

Yes, this route incorporates sections of several official trails. You will hike along parts of the Ohlone Wilderness Trail, Vista Grande Road, Flag Hill Trail, Flag Hill Road, and Eagle View Trail.

Given the significant elevation changes and exposed sections, it's crucial to bring plenty of water, sun protection (hat, sunscreen), and sturdy hiking shoes. Layers are also recommended, as temperatures can vary. Trekking poles can be helpful for the steep ascents and descents.

Flag Hill presents a strenuous ascent up a sparsely shaded path. To make it more manageable, consider starting your hike early in the morning, especially on warmer days, to avoid the midday sun. Pacing yourself and taking short breaks are key to conserving energy for the subsequent climbs on Eagle View Trail.

While not directly on this loop, the Sunol Regional Wilderness is also known for 'Little Yosemite,' a popular destination featuring a canyon, granite boulders, and rapids. It's a great spot to explore if you have extra time.