Duncans Mills – Moscow Rd back route loop from Graton

If you're seeking a truly demanding road cycling challenge in Sonoma County, the Duncans Mills – Moscow Rd back route loop from Graton delivers. This difficult 39.4-mile (63.4 km) route packs in 3049 feet (929 metres) of elevation gain, typically taking around 4 hours and 22 minutes to complete. It's an ideal pick for experienced cyclists with very good fitness looking for a significant workout away from heavier traffic.

What to expect on Duncans Mills – Moscow Rd back route loop from Graton

This loop is a journey through varied terrain, starting with the rolling hills around Graton before diving into the dense, dark redwood forests along the Russian River. You'll encounter substantial elevation gain, with steep climbs reaching grades of 12-15%, and even up to 18% in some sections, so be prepared to work for those views. The route offers a more serene experience by utilizing Moscow Road as a back route, eventually leading you through Duncans Mills, a quaint reconstructed saw mill town perfect for a mid-ride break. While much of the route is well-paved, expect some segments, particularly on Moscow Road, to have variable pavement quality or even unpaved sections that add to the challenge.

Planning your visit

This is a demanding ride requiring very good fitness. Be aware that Moscow Road has previously experienced closures due to erosion, and while repairs are ongoing, some sections might still present rugged conditions or temporary cycling prohibitions. Always check local conditions before heading out. Given the significant elevation and potential for variable road surfaces, ensure your bike is in excellent condition and you carry enough water and nutrition for the duration.

Trail details

• Distance: 39.4 miles (63.4 km)
• Elevation gain: 3049 feet (929 metres)
• Difficulty: difficult
• Estimated time: 4 hours and 22 minutes