Camino Alto Road – Pickleweed Inlet crossing loop from Larkspur

If you're looking for a challenging, self-guided gravel biking adventure that truly showcases the diverse landscapes of Marin County, the Camino Alto Road – Pickleweed Inlet crossing loop from Larkspur is a difficult 16.9 miles (27.1 km) route with 1918 feet (584 metres) of climbing, taking roughly 1 hour and 59 minutes. This route is best for experienced riders who enjoy piecing together varied terrain and aren't afraid of a significant workout.

What to expect on Camino Alto Road – Pickleweed Inlet crossing loop from Larkspur

This loop offers a dynamic journey, transitioning from the dirt and gravel of Camino Alto Fire Road to the smoother, paved paths around Pickleweed Inlet. You'll start with the steady climbs and descents of the fire road, winding through bay/oak woodlands and redwood stands, offering rewarding views of Mill Valley, San Francisco, and Mount Tamalpais. The terrain here is multi-use, so expect to share the path with hikers and equestrians. As you connect towards Pickleweed Inlet, the ride shifts to a more relaxed pace along the San Francisco Bay, where you can enjoy vistas of Mount Tamalpais and observe the rich birdlife in the wetland areas. This route suits riders who appreciate varied surfaces and a good physical challenge.

Planning your visit

Given that this specific loop combines distinct areas, careful planning is essential. There isn't a single designated trailhead parking for this exact combination, so you'll need to scout parking options near your chosen starting point in Larkspur. Be prepared for significant elevation changes on the Camino Alto Fire Road sections and ensure your bike is suitable for both dirt/gravel and paved surfaces. Marin County gravel routes can be popular, so an early start is always a good idea, especially on weekends.

Trail details

• Distance: 16.9 miles (27.1 km)
• Elevation gain: 1918 feet (584 metres)
• Difficulty: difficult
• Estimated time: 1 hours and 59 minutes