4.7
(33)
1,939
riders
26
rides
Road cycling around San Geronimo offers diverse terrain within Marin County, California. The region features a picturesque valley characterized by rolling hills, lush forests, and meandering creeks. Cyclists encounter varied landscapes including views of San Geronimo Ridge, Mount Barnabe, and Whites Hill. Routes often traverse the ecologically significant Lagunitas Creek watershed, providing a mix of paved trails and challenging climbs.
Last updated: April 26, 2026
5.0
(4)
170
riders
77.1km
03:39
870m
870m
Embark on the Hicks Valley Road Loop for a rewarding racebike experience through Marin County's varied terrain. This moderate route spans 47.9 miles (77.1 km) and features a significant 2864…
144
riders
88.5km
04:28
1,390m
1,380m
Hard road ride. Very good fitness required. Mostly well-paved surfaces and easy to ride.

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5.0
(3)
128
riders
108km
04:49
1,110m
1,110m
Hard road ride. Very good fitness required. Mostly well-paved surfaces and easy to ride.
5.0
(3)
99
riders
46.6km
02:40
1,040m
1,040m
Hard road ride. Very good fitness required. Mostly well-paved surfaces and easy to ride.
3.5
(2)
87
riders
41.3km
01:59
560m
560m
Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride.
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Paved section riding on the ridge between Pan Toll Road and Fairfax-Bolinas Road where it contains as Bolinas Ridge Trail, with spectacular views along the way toward the Pacific Ocean and Stinson Beach far below. The road is open during daylight hours only, in winter that means 9am to sunset.
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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 picnics—where trails, wildlife, and wide-open views begin.
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Good supporter of Marin Biking and nice lot to start your ride from and have a beer after
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Steep heading West can have traffic on SFD
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Embark on an adrenaline-fueled mountain biking adventure through Big Rock. The trail reaches its peak at the towering landmark, a colossal rock that adds a unique touch to the experience. Exercise caution on the descent; the pavement can get slippery, adding an exhilarating challenge to this thrilling ride.
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There are over 20 road cycling routes around San Geronimo, offering a variety of experiences for different skill levels. The komoot community has explored 24 routes in total.
Road cycling around San Geronimo is characterized by rolling hills, lush forests, and scenic valleys. Routes often include moderate elevation changes, with some challenging climbs. For example, the Nick's Cove and Boat Launch – Tomales loop from Woodacre features over 1,100 meters of elevation gain, providing a significant challenge.
While many routes offer moderate challenges, the region does provide options for less experienced riders. The paved Cross Marin Trail, which follows an old railbed along Lagunitas Creek, is generally suitable for a more relaxed ride. Additionally, areas like San Geronimo Commons offer mellow biking opportunities on scenic trails.
For experienced cyclists seeking a challenge, routes like the Nick's Cove and Boat Launch – Tomales loop from Woodacre, spanning over 107 km with significant elevation, are ideal. The region also features routes that journey towards coastal areas, such as the challenging Cross-Marin Trailhead – Point Reyes Station loop from Fairfax, offering extensive riding through varied landscapes.
Road cycling routes in San Geronimo offer diverse scenery, including views of the picturesque San Geronimo Valley, San Geronimo Ridge, Mt. Barnabe, and Whites Hill. You can also ride through lush forests, alongside the ecologically significant Lagunitas Creek watershed, and towards coastal towns. Notable landmarks include the Mount Tamalpais Summits, offering expansive views, and the tranquil Natalie Coffin Greene Park Ross.
Yes, many road cycling routes in the area are loops, providing a convenient way to explore the region. Popular loop options include the Hicks Valley Road Loop, the Sausalito Path – Nicasio loop from Sausalito, and the Fairfax – Cross Marin Trail loop from Marin Civic Center.
The road cycling routes around San Geronimo are highly rated by the komoot community, with an average score of 4.3 stars from over 20 reviews. Cyclists frequently praise the diverse and scenic landscapes, the mix of paved trails and challenging climbs, and the opportunity to explore rolling hills, lush forests, and coastal views.
Yes, you can find places to refuel. For example, Splitrock Tap & Wheel is a highlight in the area that caters to cyclists, offering a convenient stop for refreshments.
San Geronimo offers good cycling conditions for much of the year. The region benefits from a mild climate, making spring and fall particularly pleasant with comfortable temperatures and vibrant scenery. Summer is also popular, though some days can be warmer. Winter cycling is possible, but it's advisable to check local weather conditions for rain or cooler temperatures.
For families or those looking for a more relaxed ride, the paved Cross Marin Trail is an excellent choice, following a gentle grade through redwood forests. Additionally, San Geronimo Commons, a former golf course, now offers scenic trails suitable for mellow biking and wildlife watching, perfect for a family outing.
The road cycling routes around San Geronimo vary significantly in length, catering to different preferences. You can find routes ranging from shorter rides of around 58 km, like the Nicasio Reservoir – Nicasio loop from Marin County, to much longer and more challenging routes exceeding 100 km, such as the Nick's Cove and Boat Launch – Tomales loop from Woodacre.


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