Marincello Trail – Bothin Marsh Preserve loop from Mill Valley

If you're looking for a mountain biking route that delivers expansive views and a varied ride, the Marincello Trail – Bothin Marsh Preserve loop from Mill Valley is a solid choice. This moderate 11.7-mile (18.9 km) route, with 1016 feet (310 metres) of climbing, can be completed in about 1 hour and 25 minutes, making it ideal for intermediate riders seeking a rewarding workout with spectacular scenery.

What to expect on Marincello Trail – Bothin Marsh Preserve loop from Mill Valley

This route offers a journey through contrasting landscapes. You'll start on the flat, paved multi-use path of the Bothin Marsh Preserve, which provides a gentle warm-up and views of wetlands. Soon, you'll transition to the dirt and gravel of the Marin Headlands, where the Marincello Trail begins its steady, wide-open climb. As you ascend, prepare for breathtaking vistas of the North Bay, including San Rafael, the Pacific Ocean, and even glimpses of San Francisco and the Golden Gate Bridge. While the Marincello Trail itself is a graded fire road, combining it with trails like Old Springs can introduce more challenging singletrack sections that are bumpy or rutted, requiring confident bike handling.

Planning your visit

Starting this mountain biking route from Mill Valley means you'll likely use the flat Bothin Marsh path as an access point before hitting the more challenging Headlands trails. Parking can be tricky, especially at the Tennessee Valley trailhead on weekends, so plan to arrive early if you're driving. Remember that while the Bothin Marsh section is mellow, the Marincello and Headlands trails are unpaved and demand more effort, so bring enough water and be prepared for significant climbing.

Trail details

• Distance: 11.7 miles (18.9 km)
• Elevation gain: 1016 feet (310 metres)
• Difficulty: moderate
• Estimated time: 1 hours and 25 minutes