4.5
(218)
8,655
riders
9
rides
No traffic road cycling routes in Alto Bowl Open Space Preserve traverse rolling hills and diverse woodlands within Marin County, California. The preserve features dedicated paved bike paths and accessible fire roads, offering structured routes for road cyclists. These paths wind through oak woodlands and open grasslands, providing varied terrain. The area also connects to larger networks like Camino Alto and Horse Hill preserves, extending cycling possibilities.
Last updated: July 10, 2026
5.0
(2)
128
riders
31.0km
01:52
710m
710m
Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride.
156
riders
35.1km
02:10
940m
940m
Hard road ride. Very good fitness required. Mostly well-paved surfaces and easy to ride.

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5.0
(3)
28
riders
Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride.
20
riders
76.7km
04:09
1,410m
1,410m
Hard road ride. Very good fitness required. Mostly well-paved surfaces and easy to ride.
5.0
(1)
28
riders
Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride.
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Popular around Alto Bowl Open Space Preserve
There is a fire road that runs along the treeless top of the uplands, as well as a winding paved drive down by the coast. There are also some steep hiking trails. From the uplands you get great views of San Francisco Bay and especially Angel Island.
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Constructed in 1917 this dam forms Alpine Lake, which sites between Kent and Bon Tempe Lakes. The road across the top of the dam make it a great place to ride on a loop around the lake.
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This lake was formed by the building of Alpine Dam in 1917. It sits between Kent Lake and Bon Tempe Lake, and is popular for a variety of outdoor activities.
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Set beneath the towering trees of Mount Tam, Rock Springs is the perfect jumping-off point for scenic hikes and quiet picnicsโwhere trails, wildlife, and wide-open views begin.
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The Pantoll Campground is a First-come/first-serve site in Mt. Tamalpais State Park. Each site has a barbeque grill, a fire ring, and a picnic table. You need to pay for the site at the Ranger Station as you enter the park.
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Now open for more than a hundred years, this inn welcomes visitors high on the flanks of Mount Tamalpais. The guestrooms mostly face east, but the grounds include great vantages to the west over the Bay. There's also a restaurant, and this has been voted one of the most romantic spots in the Bay Area several times over.
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There are 7 dedicated no-traffic road cycling routes in Alto Bowl Open Space Preserve, ranging from moderate to difficult in intensity. These routes utilize paved paths and accessible fire roads, offering a structured and enjoyable experience for road cyclists.
You'll experience a diverse landscape of rolling hills, oak woodlands, and open grasslands. Routes often wind through forested sections with eucalyptus, California bays, and coast live oaks, as well as exposed ridges. From higher points, you can enjoy panoramic views of Tiburon Ridge, the San Francisco skyline, the Richmond-San Rafael Bridge, and Mount Tamalpais.
While the preserve's routes are generally rated moderate to difficult, the presence of dedicated paved bike paths on the east and west sides, connected by Lomita Drive, offers a more controlled environment. These sections could be suitable for families looking for a less strenuous ride, though specific family-friendly routes are not explicitly listed as easy.
The preserve is enjoyable year-round, but spring is particularly beautiful when the hillsides come alive with wildflowers like hound's tongue, California poppy, and lupine. Wildlife is also active during this time. Always check local weather conditions before heading out.
From various high points, you can enjoy impressive views of Tiburon Ridge, the San Francisco skyline, and the Richmond-San Rafael Bridge. Mount Tamalpais is also visible. The adjacent Horse Hill, known for its grazing horses, offers a charming sight and a historical link to Marin's ranching legacy.
Yes, Alto Bowl Open Space Preserve offers several challenging routes. For instance, the Alpine Lake โ Alpine Dam loop from Larkspur covers 76.2 km with over 1400 meters of elevation gain, making it a demanding ride. Another option is the Pantoll Road โ Mount Tamalpais Summits loop from Mill Valley, a 47.7 km route with nearly 1200 meters of ascent.
The area is highly rated by the komoot community, with an average score of 4.7 stars. Reviewers often praise the preserve's scenic beauty, the variety of terrain from woodlands to open grasslands, and the impressive panoramic views from higher elevations. The connectivity to other open spaces for extended rides is also a highlight.
Yes, several routes offer a loop experience. For example, the Mount Tamalpais State Park โ Mountain Home Inn loop from Tamalpais-Homestead Valley is a moderate 22.6 km loop. Another challenging loop is the Alpine Dam & Mount Tamalpais East Peak loop from Downtown San Rafael, covering over 65 km.
While the region research mentions no restrooms at the preserve, it implies accessibility. For specific parking information related to road cycling trailheads, it's advisable to check local signage or detailed route descriptions on komoot, as parking availability can vary by access point.
Absolutely. Alto Bowl Open Space Preserve is part of an interconnected network of public lands. This allows cyclists to seamlessly transition between different preserves like Camino Alto and Horse Hill, and even further to Blithedale Summit, extending your road cycling possibilities for longer and more varied excursions.
Yes, there are moderate options available. The Pan Toll Road via Panoramic Highway is a moderate route covering approximately 31 km with over 700 meters of elevation gain. Another moderate choice is the Mount Tamalpais State Park โ Mountain Home Inn loop from Tamalpais-Homestead Valley.


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