Sunshine Canyon, Poorman Road, and Boulder Canyon loop from Pearl Street — Gravel

The route is approximately 17 kilometers (10.6 miles) long. Komoot estimates the cycling time to be around 1 hour and 26 minutes for this specific loop. However, expert riders might complete a longer 21-mile version in 2-3 hours, while beginners could take 3.5-4.5 hours due to the challenging climbs.

The route features a diverse mix of paved and unpaved surfaces, making it ideal for gravel bikes. You'll encounter asphalt, gravel, and dirt roads. For instance, the ascent up Sunshine Canyon starts paved but transitions to gravel. Poorman Road is primarily a significant gravel connector, and the Boulder Creek Path offers a mix of concrete and finely crushed gravel.

This loop is generally considered a moderate to hard ride, demanding good fitness. The climbs, particularly on Sunshine Canyon, are strenuous with significant grades. Sunshine Canyon is a Category 1 climb, averaging 6% over 14.5 kilometers, with sections reaching 10.2% or even 12.4%. It's more suited for cyclists with some experience and a good fitness level.

The route starts from Pearl Street in Boulder. You'll find various parking options around the Pearl Street area, including street parking and public garages. Always check local signage for parking regulations and fees.

The route offers diverse and beautiful Colorado landscapes. As you ascend Sunshine Canyon, you'll see foothills, impressive homes, tall grass, and pine trees, with vistas extending to the Indian Peaks Wilderness. You'll also ride along Poorman Road, connect through Fourmile Canyon, and enjoy views of Boulder Creek along the Boulder Creek Path. The ride can also lead to the historic town of Gold Hill, known for its dirt roads and historic buildings.

The best time to cycle this loop is typically during the spring, summer, and fall months when the weather is milder and the roads are clear of snow and ice. Always check local weather conditions before heading out, especially for potential afternoon thunderstorms in summer or early snow in late fall.

Yes, this route traverses areas managed by Boulder Open Space and Mountain Parks. While there are generally no entrance fees for cycling, it's crucial to be aware of and adhere to all local regulations, including trail etiquette, speed limits, and any specific rules for gravel roads. Always check the official Boulder Open Space and Mountain Parks website for the most current information on permits, closures, and regulations.

While the route is a cycling loop, dogs are generally permitted on leash in many areas of Boulder Open Space and Mountain Parks. However, bringing a dog on a challenging gravel cycling route like this may not be practical or safe for the animal. If you do bring a dog, ensure they are on a leash and that you adhere to all local pet regulations.

Yes, the route incorporates sections of several well-known paths. Notably, a significant portion follows the

Boulder Creek Path

Sunshine Canyon Trail

Boulder Canyon Trail

When descending through Boulder Canyon, consider using the recently reopened Boulder Creek Path. It offers a safer and more scenic alternative to the narrow and twisting main road, providing a more enjoyable experience alongside Boulder Creek.

Given the challenging nature and mixed terrain, you should bring a well-maintained gravel bike, plenty of water, snacks, a repair kit (including spare tubes/patch kit), appropriate cycling attire for varying weather, sun protection, and a helmet. A GPS device or a loaded Komoot route is also highly recommended for navigation.