Marincello, Bobcat, Miwok and Old Springs Loop

This loop is generally rated as intermediate, making it suitable for strong beginners or any intermediate rider. While much of the ride is not overly strenuous, sections like the Miwok climb can be a grind, and parts of the Miwok and Old Springs trails might challenge less confident riders, potentially requiring them to walk their bikes.

The terrain is quite varied. You'll find mostly gravel fire roads, but also enjoyable singletrack sections, particularly on the Old Springs Trail. The Marincello Trail offers a moderate climb with a reasonable 9.5% grade, while the Miwok Trail includes a climb averaging 12%, with some challenging sections reaching 14%. Some parts can be bumpy or rutted.

You can expect spectacular and expansive views throughout the loop. The Marincello Trail climb offers vistas of the North Bay, San Rafael, the Pacific Ocean, and glimpses of San Francisco and the Golden Gate Bridge. The Bobcat Trail also provides broad views across the Marin Headlands toward the Pacific Ocean and south towards the Golden Gate. On clear days, you'll have great views of the Headlands and Tennessee Valley.

The most common starting point is the Tennessee Valley parking lot. It offers restrooms, but be aware that parking can be difficult on weekends due to its popularity. Arriving early is highly recommended, especially on busy days.

No, there are no specific permits or entrance fees required to access the Marincello, Bobcat, Miwok and Old Springs Loop, as it is part of the Golden Gate National Recreation Area. However, standard park regulations apply, including a 15 mph speed limit on trails.

The trail is generally dog-friendly, but specific regulations regarding leashes and areas where dogs are permitted can vary within the Golden Gate National Recreation Area. It's always best to check the official park website for the most current rules before you go.

The loop can be enjoyed year-round, but clear, fog-free days offer the best views. Spring and fall often provide pleasant temperatures and good trail conditions. Be mindful of potential mud after heavy rains, especially on certain sections.

Yes, e-bikes are allowed on the Marincello, Bobcat, Miwok and Old Springs Loop. However, please remember that the trail is part of a national park site, and a 15 mph park speed limit is enforced, especially on faster sections like the Bobcat Trail fire road. Always be mindful of other trail users, including hikers and horses.

Yes, the route intersects with several other paths. You'll find sections that are part of the ADT - California - T - Seg 9, the Bay Area Ridge Trail - 01 - North Bay, and the California Coastal Trail. The Bobcat Trail itself is also a significant part of the loop.

The Miwok Trail climb can be quite challenging, with steep grades up to 14%. The Old Springs Trail is a celebrated 'legal singletrack' that's particularly enjoyable when ridden downhill, featuring low wooden steps and stone-paved dips. Always be aware of the 15 mph park speed limit and share the trail respectfully with hikers and horses, especially on shared sections. Consider arriving early on weekends to secure parking at Tennessee Valley.

On average, mountain biking the Marincello, Bobcat, Miwok and Old Springs Loop takes approximately 1 hour and 20 minutes to complete. This duration can vary depending on your fitness level, the number of stops you make for views, and trail conditions.