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San Geronimo

San Geronimo Ridge

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San Geronimo Ridge

Mountain biking

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    December 8, 2016

    Mountain biking

    San Geronimo Ridge Fire Road extends from Peter’s Dam to the end of Samuel P Taylor State Park, making it among the most scenic (and longest) fire roads in Marin.
    Hikers, bicyclists, and equestrians wishing to link together longer outings use this gravel dirt road that connects with White’s Hill and Cascade Canyon preserves, as well as many popular trails and roads in the MMWD watershed. It runs on a ridge with spectacular views above Kent Lake to the west and for about 5 miles through Gary Giacomini Open Space Preserve to the east.

    October 9, 2025

    Mountain biking

    Quite a bit of elevation climbing on this loop, sure does help having a class 1 e-bike at 67 yrs. Loved the ride!

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    Routes here

    Best routes to San Geronimo Ridge

    5.0

    (1)

    7

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    1. Bolinas and San Geronimo Ridge Loop

    34.9km

    03:40

    970m

    970m

    This difficult 21.7-mile mountain biking loop offers challenging climbs, rewarding descents, and diverse scenery in the Mount Tamalpais Wate

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    Hard

    Hard mountain bike ride. Very good fitness required. Suitable for all skill levels.

    Hard

    Details

    Informations

    Distance 10.1Β km

    Uphill 460Β m

    Downhill 100Β m

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    Thursday 5 March

    18Β°C

    5Β°C

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    Additional weather tips

    Max wind speed: 18.0Β km/h

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    Location: San Geronimo, Marin County, California, United States

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