Thermalito, Ridgeline, and Oak Tree Trail Loop

The full loop is approximately 11.1 km (6.9 miles) long and generally takes around 3 hours and 21 minutes to complete. This duration can vary based on your pace, stops for views, and trail conditions.

The trail offers a diverse mix of terrain. You'll encounter grassy slopes, exposed sections with expansive views, and shady stretches through oak forests and woodlands. There are also open meadows and an olive tree grove. While much of the path is wide, some parts feature uneven ground, rocks, and roots, especially on steeper sections. A portion of the Oak Tree Trail is a gravel road, and during summer, trails can be dry and dusty due to grazing.

This loop is generally rated as moderate. However, some sections, particularly along the Ridgeline and parts of the Oak Tree Trail, can be intermediate to difficult due to moderate to steep inclines and uneven terrain. There's a notable steep uphill climb on the Oak Tree Trail near the start, and some shortcuts can make sections significantly harder. While not overly challenging for experienced hikers, beginners should be prepared for some strenuous parts.

You'll enjoy rewarding views of the Sunol Valley and the broader Tri-Valley area from the ridge. The trail is abundant with oak trees, and in spring, wildflowers add vibrant color. Look out for an olive tree grove about 1.5 miles in. Historical elements like the Nipper Ranch house and barn (dating to around 1900) can also be observed. The trail is part of Pleasanton Ridge Regional Park.

Yes, the route incorporates sections of several other trails within the park. You'll hike along portions of the Ridgeline Trail, Thermalito Trail, Oak Tree Trail, and Woodland Trail.

Yes, the trail is popular with dog walkers. Please ensure your dog is kept on a leash and that you follow all park regulations regarding pets.

Spring is ideal for experiencing vibrant wildflowers. Early mornings are recommended year-round to enjoy a more peaceful and serene atmosphere with fewer people. Be aware that summer can bring dry and dusty conditions due to grazing.

There are no entrance fees or permits required to access Pleasanton Ridge Regional Park or hike this loop.

Access to the trail is typically from within Pleasanton Ridge Regional Park. There are designated parking areas available at the park's entrances. Arriving early, especially on weekends, is advisable to secure a spot.

Yes, the Oak Tree Picnic area, which is part of this loop, offers facilities including restrooms and water. It's always a good idea to carry sufficient water, especially on warmer days, as exposed sections can be quite sunny.

You might encounter cattle grazing in certain areas, so remember to keep gates closed behind you. For a more tranquil experience, start your hike early in the day to avoid crowds. While generally peaceful, some sections of the trail may have audible traffic noise from Highway 680.