4.7
(17)
378
riders
16
rides
Gravel biking in Ring Mountain Open Space Preserve offers routes through diverse landscapes on the Tiburon Peninsula. The preserve features grassy slopes, oak woodlands, and wildflower-strewn grasslands, with fire roads explicitly welcoming bikes. These routes provide panoramic views of the Bay Area, including Mount Tamalpais and the San Francisco skyline. The terrain is characterized by unique geology and supports rare plant species, creating varied conditions for gravel cyclists.
Last updated: July 10, 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.
5.0
(2)
28
riders
45.1km
03:18
770m
770m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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15
riders
45.7km
03:59
1,180m
1,180m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
5.0
(2)
41
riders
36.3km
02:34
510m
510m
Hard gravel ride. Very 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.
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Popular around Ring Mountain Open Space Preserve
Batterij Townsley is a place where nature and history meet. As you climb along the rugged cliffs of the Marin Headlands, the old coastal defense slowly emerges from the landscape. Once at the top, a panorama opens up that will leave you speechless: the Pacific Ocean, the Golden Gate Bridge, and the endless horizon. The abandoned bunkers and tunnels give the place a mysterious atmosphere, as if time has stood still here. A perfect stop to enjoy, wander, and completely immerse yourself in the view.
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Part of the coastal defenses along Coastal Trail, latest remnants here date from the WW II and early cold war era.
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At this point on Sky Oaks Road, there is a junction with Shaver Grade Road, which connects with a dense network of trails and dirt roads near Bald Hill in the Mount Tamalpais State Park. From here, you can continue on the paved Sky Oaks Road or go arond the gate on to the gravel Shaver Grade Road.
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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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There are, indeed, horses on this hill. Connector path between Mill Valley and Corte Madera, easier than Camino alto. The alto tunnel is still closed, learn more here: https://openaltotunnel.org/
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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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Komoot features over 20 gravel bike routes in and around Ring Mountain Open Space Preserve that are designed to be traffic-free. These routes primarily utilize the preserve's fire roads, which are explicitly welcoming to bikes and offer a fantastic way to explore the area's unique landscapes.
Ring Mountain is ideal for gravel biking due to its extensive network of fire roads, which are explicitly open to bikes and offer unpaved, wider paths away from vehicular traffic. These routes provide varied terrain, from moderate to more challenging sections, winding through oak woodlands, wildflower-strewn grasslands, and areas with seasonal creeks. The preserve also boasts stunning 360-degree views of the entire Bay Area, including Mount Tamalpais, the San Francisco skyline, and the Golden Gate Bridge.
While many routes in the broader area are rated as difficult, Ring Mountain's fire roads offer varied terrain. Some sections are suitable for those seeking a moderate ride, though the preserve is known for routes that can require good fitness. It's best to check individual route details on komoot for elevation and distance to find one that matches your family's skill level. The preserve's natural beauty and points of interest can make even shorter rides enjoyable for families.
Ring Mountain is rich in unique attractions. You can encounter its renowned unique geology, featuring minerals like amphibolite and eclogite, and observe rare plant species such as the Tiburon mariposa lily, especially vibrant during spring wildflower blooms. Don't miss Petroglyph Rock, with ancient carvings by the Coastal Miwok, or the massive Turtle Rock. You might also spot diverse wildlife, including various raptors. For more information on the preserve's natural wonders, you can visit Visit Marin's page on Ring Mountain.
Spring is particularly spectacular for gravel biking in Ring Mountain, as the preserve is famous for its extensive wildflower displays, including buttercups and shooting stars. The weather is generally mild, making for pleasant riding conditions. Fall also offers comfortable temperatures and clear views. While accessible year-round, summers can be warm, and winters might bring rain, affecting trail conditions.
Yes, many of the fire roads within Ring Mountain Open Space Preserve can be combined to form circular routes, allowing you to start and end at the same point. This provides a diverse experience without retracing your steps. For example, the 1.76-mile Phyllis Ellman Loop Trail offers a nature journey through varied ecosystems, and can be incorporated into longer rides on the fire roads.
The komoot community highly rates the gravel biking experience in Ring Mountain Open Space Preserve, with an average score of 4.7 out of 5 stars. Reviewers frequently praise the stunning panoramic views of the Bay Area, the sense of tranquility on the traffic-free fire roads, and the unique natural beauty, especially during wildflower season. The varied terrain and opportunities to explore geological and historical sites are also often highlighted.
Yes, Ring Mountain Open Space Preserve offers several challenging gravel biking options. Many of the routes in the area are rated as 'difficult' on komoot, featuring significant elevation gains and varied terrain that will test your fitness and skills. For instance, routes like Alpine Dam β Fish Gulch trail junction loop from Alta or Old Mine Trail (lower) π² loop from Mill Valley offer substantial climbs and long distances, providing a rewarding challenge for experienced gravel riders.
Parking is available at various access points around Ring Mountain Open Space Preserve. Common starting points often have designated parking areas, though these can fill up quickly on busy days. It's advisable to arrive early, especially on weekends, to secure a spot. Always check local signage for any parking restrictions or fees.
While Ring Mountain Open Space Preserve is primarily accessed by car, some public transportation options may get you close to the area. However, direct access to trailheads via public transport can be limited. It's recommended to check local bus schedules and routes for the Tiburon Peninsula area to see if any stops are within a reasonable biking distance of the preserve's entrances.
After your ride, you'll find various cafes and restaurants in the nearby towns on the Tiburon Peninsula, such as Tiburon itself or Larkspur. These towns offer a range of dining options, from casual cafes perfect for a post-ride snack to more formal restaurants. You can also find breweries in the wider Marin County area if you're looking for a refreshing drink.


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