The best MTB trails in Alto Bowl Open Space Preserve
4.7
(134)
1,932
riders
102
rides
Last updated: October 7, 2025
4.9
(20)
132
riders
1. Old Mine Trail (lower) 🌲 loop from Mill Valley
45.0km
04:17
1,080m
1,080m
Expert mountain bike ride. Very good fitness required. Suitable for all skill levels.
4.5
(4)
72
riders
2. Railroad Grade Fire Road – Fern Creek and spring loop from Mill Valley
42.1km
04:05
1,050m
1,050m
Expert mountain bike ride. Very good fitness required. Suitable for all skill levels.
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5.0
(2)
49
riders
3. Bobcat Trail – Marincello Trail loop from Mill Valley
30.8km
02:45
660m
660m
Intermediate mountain bike ride. Good fitness required. Suitable for all skill levels.
5.0
(2)
17
riders
Intermediate mountain bike ride. Good fitness required. Suitable for all skill levels.
11
riders
5. Gestalt Haus loop from Corte Madera
21.7km
01:08
80m
80m
Easy mountain bike ride. Great for any fitness level. Suitable for all skill levels.
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