Big Rock Ridge – 680 Trail loop from Novato Hamilton

The Big Rock Ridge – 680 Trail loop from Novato Hamilton is one of those mountain biking routes that truly earns its "difficult" rating, offering a challenging 26.9 miles (43.3 km) with a substantial 4760 feet (1451 metres) of climbing, all packed into an estimated 4 hours and 45 minutes. This is a ride for mountain bikers with very good fitness and advanced skills who are ready for significant effort rewarded by incredible views.

What to expect on Big Rock Ridge – 680 Trail loop from Novato Hamilton

Expect a journey through varied terrain, starting with some tree cover before opening up to the exposed grasslands of Big Rock Ridge. The 680 Trail section offers flowing singletrack, but connecting to it often means tackling strenuous fire road climbs, like those up Loma Alta, where grades can exceed 20%. As you ascend, the views expand dramatically, revealing panoramic vistas of Mount Saint Helena, San Pablo Bay, Mount Diablo, and even the San Francisco skyline, including a glimpse of the Golden Gate Bridge. This route demands consistent effort, with some sections potentially requiring you to push your bike, but the 360-degree scenery from Marin County's second-tallest peak makes every pedal stroke worthwhile.

Planning your visit

Given the significant elevation gain and exposed sections, plan your ride for cooler parts of the day or year, and always carry plenty of water. The trailhead near Novato Hamilton provides access to this extensive loop. Be prepared for a long day in the saddle, as this is a demanding route best suited for experienced riders looking for a serious workout and spectacular Bay Area scenery.

Trail details

• Distance: 26.9 miles (43.3 km)
• Elevation gain: 4760 feet (1451 metres)
• Difficulty: difficult
• Estimated time: 4 hours and 45 minutes