4.6
(13)
317
riders
22
rides
Gravel biking around Muir Beach offers a diverse landscape characterized by coastal bluffs, rolling hills, and the foothills of Mount Tamalpais. The region features a network of trails that combine both paved and unpaved surfaces, providing varied riding experiences. Riders can navigate through areas with panoramic ocean views, redwood forests, and open terrain. Elevation changes in the area range from gentle coastal paths to challenging climbs up Mount Tamalpais.
Last updated: July 1, 2026
4.8
(6)
73
riders
47.4km
04:21
1,270m
1,270m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
15
riders
45.7km
03:59
1,180m
1,180m
The Phoenix Lake โ Fish Gulch trail junction loop from Mill Valley offers a demanding yet incredibly scenic gravel biking adventure. You'll wind through diverse landscapes, from the cool shade of redwood forests to sun-drenched oak woodlands and open grasslands, with the promise of sweeping views of the Pacific Ocean and Golden Gate Bridge from higher points near Mount Tamalpais. This route is a true test of endurance, featuring steep and loose sections that demand very good fitness and bike handling skills.
Planning your ride requires a bit of foresight; while much of the loop is prime for gravel biking, be aware that the immediate trails around Phoenix Lake itself may not allow bikes. Parking is generally available in Mill Valley, but it's always wise to arrive early, especially on weekends, to secure a spot. Given the route's length and elevation, pack ample water and snacks, and consider starting early to make the most of the daylight.
This loop is a standout in the Mill Valley area, celebrated by local gravel bikers for its challenging terrain and the opportunity to combine dirt climbs with rewarding road descents. It showcases the region's extensive trail network and significant elevation gains, making it a prime destination for those looking to push their limits and experience the natural beauty of Marin County.

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4.0
(2)
10
riders
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
10
riders
51.6km
04:12
1,200m
1,200m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
4.0
(1)
4
riders
The Tennessee Valley Trailhead โ Panoramic Highway loop offers a dynamic gravel biking adventure through the Golden Gate National Recreation Area. This moderate 13.2-mile (21.2 km) route, which typically takes around 1 hour and 36 minutes, features a mix of dirt trails, gravel roads, and paved sections, with 1326 feet (404 metres) of elevation gain. You'll ride through verdant valleys, past coastal scrub, and enjoy panoramic views of the Pacific Ocean and Marin Headlands, often catching glimpses of the Golden Gate Bridge from higher points.
Planning your ride requires some foresight, as the Tennessee Valley Trailhead parking lot can fill up quickly during peak hours. Be ready for varied conditions; while some fire roads are smooth, sections like the initial climb on Old Springs Trail are steep and may require hike-a-biking. The climate can also shift dramatically, from warm in the valley to cold and foggy near Rodeo Beach, so dress in layers.
Beyond the natural beauty, this route is steeped in history, passing by World War II military fortifications like Battery Townsley. The area is also part of the Mount Tamalpais region, widely recognized as the birthplace of mountain biking, adding a unique historical layer to your ride. It's a fantastic option for experienced riders looking for a challenging and scenic outing.
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Beginning of the wide gravel fire road following along the crest of Coyote Ridge from Miwok Trail down towards the beach.
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This tidal sanctuary runs along the Mill Valley-Sausalito Pathway and the Charles F. McGlashan Pathway. More than 400 species of migratory birds rest here after their long flights, and if you pass through in the early morning or late evening, the sunrises and sunsets reflect beautifully on the surface of this 106-acre marsh.
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There is a great view of the northern point of Alpine lake where a small channel feeds over to Bon Tempe Lake. This is a great place to drop a line, or just enjoy the aquatic views.
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From easiest to hardest climbs out of phoenix lake from this junction: -Shaver Grade, easy grade, longer, shaded and pretty -Eldridge Grade, medium, good length and can connect you to mt tam east peak -Fish Grade fire road, very steep, we hiked the bikes
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There are over 25 gravel bike trails around Muir Beach, offering a diverse range of experiences. These routes are highly rated by the komoot community, with an average score of 4.5 stars from over 10 reviews.
The gravel biking trails around Muir Beach are predominantly moderate to difficult. You'll find a good selection of challenging routes, with 21 trails rated as difficult and 6 as moderate. These often involve significant elevation changes as you climb towards Mount Tamalpais or navigate coastal bluffs.
While many routes in Muir Beach are rated moderate to difficult, some sections of trails like the Pantoll Road loop from Mill Valley include mostly paved surfaces, which can be more accessible for beginners. However, be prepared for varying difficulty levels and elevation changes even on these routes.
Gravel biking around Muir Beach offers a stunning variety of landscapes. You'll experience panoramic ocean views, coastal bluffs, and the rugged beauty of the Marin Headlands. Many routes also ascend Mount Tamalpais, providing rewarding climbs with spectacular vistas towards the foothills and Muir Woods, often winding through redwood forests and open terrain.
Yes, the area is rich with scenic viewpoints. The Railroad Grade Fire Road loop from Mill Valley, for instance, offers expansive vistas from the West Point of Mount Tamalpais. The Muir Beach Overlook is another rocky point providing sweeping views of the Pacific Coast, including the Point Reyes Peninsula and San Francisco. You can also find great views from highlights like Mount Tamalpais Summits.
Beyond the trails, you can explore several natural attractions. Muir Woods National Monument, just three miles from Muir Beach, is home to ancient old-growth redwoods. The Bothin Marsh Preserve and Phoenix Lake offer serene natural settings. You might also encounter wildlife, including monarch butterflies during migration season, and even spot whales from coastal vantage points.
Yes, many gravel routes in the area are designed as loops. Examples include the Pantoll Road loop from Mill Valley, the Railroad Grade Fire Road loop from Mill Valley, and the Old Mine Trail (lower) ๐ฒ โ Coast View Trail loop from Tamalpais-Homestead Valley. These loops allow you to experience diverse terrain without retracing your steps.
Muir Beach offers good gravel biking conditions year-round, but spring and fall are particularly pleasant with milder temperatures and less fog. Winter can be a good time for whale watching, while autumn brings monarch butterflies. Always check local weather and trail conditions before heading out, as coastal weather can change rapidly.
While Muir Beach is accessible by car, public transport options directly to trailheads can be limited. It's advisable to check local bus schedules for Marin County, as some routes might get you close to the general area, but direct access to specific gravel trail starting points often requires personal transport or a short ride from a bus stop.
Parking is available at Muir Beach itself, with a 450-foot pedestrian bridge connecting the parking lot to the beach and the Coastal Trail. For routes starting further inland, such as those near Mill Valley or Tamalpais-Homestead Valley, you'll find various parking areas, often near trailheads or in designated park lots. Always check local signage for parking regulations and fees.
Muir Beach itself is a quieter area, but you can find amenities in nearby towns. Mill Valley, a common starting point for many routes like the Phoenix Lake โ Fish Gulch trail junction loop, offers a selection of cafes, restaurants, and pubs where you can refuel after your ride. Stinson Beach, another coastal town, is also a short drive away.
Due to the coastal influence and varied terrain, it's best to dress in layers. The weather can change quickly from cool and foggy to warm and sunny. Essential gear includes a helmet, appropriate cycling attire, gloves, and sturdy shoes. Always carry water, snacks, and basic repair tools for your bike.
Both Muir Beach and Stinson Beach offer excellent coastal gravel biking. Muir Beach is known for its direct access to Mount Tamalpais climbs and the rugged Marin Headlands, providing more challenging, elevation-heavy routes. Stinson Beach, while also scenic, might offer slightly flatter coastal sections and is a popular starting point for rides along the Bolinas Ridge. Muir Beach generally provides a more diverse mix of challenging climbs and varied terrain.


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