Battery Townsley – Horse Barn loop from Marin City

If you're looking for a mountain biking route that packs a punch with both historical intrigue and jaw-dropping coastal views, the Battery Townsley – Horse Barn loop from Marin City is a moderate 13.2-mile (21.3 km) ride that delivers. With 1776 feet (541 metres) of elevation gain and an estimated duration of 2 hours and 2 minutes, this loop is best suited for intermediate to advanced riders ready for a challenge in the Marin Headlands.

What to expect on Battery Townsley – Horse Barn loop from Marin City

The journey on this loop is a dynamic one, taking you from wide fire roads to technical singletrack. You'll encounter significant climbs, like the steady 9% grade on Marincello fire road or the challenging "horse trail stairs" and deep ruts on the Miwok Trail. The reward for your effort is spectacular scenery, with majestic views of the San Francisco Bay, Mount Tamalpais, and the Pacific Ocean, including glimpses of the Golden Gate Bridge. A highlight is exploring the World War II-era Battery Townsley, offering sweeping ocean vistas. This varied terrain, including loose sections and ruts, means the route is best for intermediate to advanced riders with good bike handling skills and climbing prowess.

Planning your visit

When planning your visit to these popular mountain bike trails in the Marin Headlands, be aware that many trails are mixed-use, shared with hikers and horses. You'll need to be mindful of others, especially when passing through areas like the Miwok Livery Stables, where walking your bike is required for horse safety. The best time to mountain bike this loop is often on clear days to fully appreciate the expansive coastal views, which can extend to the Farallon Islands. Always carry enough water, especially during warmer months, as the climbs can be demanding.

Trail details

• Distance: 13.2 miles (21.3 km)
• Elevation gain: 1776 feet (541 metres)
• Difficulty: moderate
• Estimated time: 2 hours and 2 minutes