Mount Olympia

Embark on the Four Peaks loop, a challenging hike that takes you through varied terrain and offers sweeping vistas across the Bay Area. This difficult route covers 14.1 miles (22.8 km) and demands a significant elevation gain of 3914 feet (1193 metres), typically requiring about 7 hours and 43 minutes to complete. As you ascend, you'll experience the trail's largely exposed sections, leading to the Mount Diablo Summit where unparalleled panoramic views await, stretching from the Central Valley to Mount Tamalpais and even the distant Sierra Nevadas on clear days. Keep an eye out for unique vegetation and blooming flowers, especially if you visit on cooler spring days. The journey is a true test of endurance, but the rewards are the expansive views and the sense of accomplishment.

When planning your visit, remember that the trail is largely exposed, so bring ample water and sun protection to stay comfortable throughout your hike. Be aware of poison oak, particularly on singletrack sections, and know how to identify and avoid it. The Mount Diablo Summit provides essential amenities like a visitor center, restrooms, and water, making it a crucial stop to refuel and refresh during your long journey. Starting early in the morning is advisable to make the most of cooler temperatures and avoid the midday sun.

This loop is one of the most rewarding routes in Mount Diablo State Park for its landmarks and viewpoints, offering a comprehensive experience of the park's natural beauty. The dramatic and sweeping vistas from the summit are a highlight, showcasing the vastness of the region. Beyond the physical challenge, the trail provides a chance to connect with the unique ecosystem of the area, making it a notable adventure for those seeking both strenuous activity and stunning scenery.