Meyers Grade Road – Duncans Mills loop from Big Oat Mountain

The Meyers Grade Road – Duncans Mills loop from Big Oat Mountain is one of Sonoma County's most challenging road cycling routes, a difficult 31.9-mile (51.3 km) journey with a substantial 2960 feet (902 metres) of elevation gain, typically completed in just under 3 hours. If you're an experienced road cyclist with very good fitness looking for a rigorous workout and breathtaking coastal views, this loop delivers a memorable experience.

What to expect on Meyers Grade Road – Duncans Mills loop from Big Oat Mountain

This route is a true test of endurance, particularly on Meyers Grade itself, which climbs 858 feet over 1.9 miles with an average grade of 8.8%. Expect sustained sections of 10-15%, with some pitches reaching 15-20%. As you ascend, the first half of the climb offers expansive viewpoints of the Pacific Ocean, gradually giving way to serene tree tunnels near the summit. The descent, however, is known as one of Sonoma County's most exhilarating, fast, and beautiful, eventually leading you towards the Russian River beach and bridge near Monte Rio.

Planning your visit

Given the demanding nature of this road cycling route, ensure you are well-prepared with sufficient water and nutrition, as services can be limited for much of the journey. The roadway surface on Meyers Grade is generally in good condition, and you can expect minimal traffic, making for a focused ride. While specific parking details for the Big Oat Mountain starting point aren't detailed, planning your approach to this hilly Sonoma Coast area is key for a smooth start.

Trail details

• Distance: 31.9 miles (51.3 km)
• Elevation gain: 2960 feet (902 metres)
• Difficulty: difficult
• Estimated time: 2 hours and 54 minutes