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Routes
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United States
California
Marin County

Alto Bowl Open Space Preserve

The best MTB trails in Alto Bowl Open Space Preserve

4.6

(157)

1,759

riders

88

rides

Looking for the best mountain biking routes in Alto Bowl Open Space Preserve? Then browse our collection of mtb rides around this beautiful natural park in Marin County below — and discover more of on your next visit.

Last updated: December 16, 2025

4.9

(20)

132

riders

1. Old Mine Trail (lower) 🌲 loop from Mill Valley

45.0km

04:17

1,080m

1,080m

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

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Hard

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

Hard
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Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

Moderate

Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

Moderate

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

Hard
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