Gold Hill via Fourmile and Sunshine Canyons

The Gold Hill loop is best enjoyed from late spring through early fall. During these months, the weather is generally favorable, and the dirt sections are less likely to be muddy or snow-covered, providing the best conditions for a mixed-terrain ride.

This route offers a true mixed-terrain experience, combining smooth tarmac, crushed gravel bike paths, and unpaved rural dirt roads. You'll encounter sustained climbs, including sections with an 8% average grade on dirt, and thrilling descents with steep paved sections up to 14% and rough, loose dirt on the Sunshine Canyon (Gravel Section) descent.

The dirt descent on Sunshine Canyon (Gravel Section) can be particularly challenging due to rough, loose dirt and tight, decreasing radius turns, requiring careful speed control. Some sections may even require you to push your bike. While road bikes with regular tires can manage some dirt sections, a gravel bike is often preferred for a more comfortable experience on the unpaved parts.

The route typically starts from Boulder, allowing you to access it from various points within the city. Parking is available in public lots and on-street in Boulder, though specific trailhead parking for this loop isn't designated as it often begins directly from town.

The route offers beautiful scenery, including picturesque meadows, enchanting forests, and winding creeks. You'll pass granite cliffs, areas impacted by the 2010 Fourmile Canyon fire, and enjoy panoramic views of the Rocky Mountains and Indian Peaks. A popular stop is the historic Gold Hill General Store in the charming mining village of Gold Hill, and you'll also pass through Fourmile Canyon (Boulder Canyon to Poorman) and Sunshine Canyon (Gravel Section).

As this is primarily a cycling route that uses public roads and some multi-use paths, dogs are generally allowed if leashed and under control, following local regulations. However, always check specific signage for any sections that might have restrictions, especially on dedicated trails or private property.

No, there are no specific permits or entrance fees required to cycle the Gold Hill via Fourmile and Sunshine Canyons route, as it primarily utilizes public roads and open space trails around Boulder.

Yes, you'll find options to refuel. The historic Gold Hill General Store is a popular stop in Gold Hill. Additionally, the route passes near Spruce Confections, offering another opportunity for a break and refreshments.

The route is approximately 37 kilometers (23 miles) long with over 1000 meters (3280 feet) of elevation gain. For a touring cyclist, it typically takes around 3.5 hours to complete, depending on fitness level and stops.

Yes, the route intersects with or runs alongside several other well-known paths. You'll encounter sections of the Boulder Creek Path, Fourmile Link Trail, and the Switzerland Trail Colorado and North Western R.R., among others, as you navigate the canyons and climbs.

No, this route is considered 'difficult' and requires very good fitness due to significant elevation gain and challenging mixed terrain, including steep dirt climbs and descents. It is not recommended for beginners or families with young children.