The best MTB trails in Horse Hill Open Space Preserve
4.6
(174)
2,115
riders
111
rides
Last updated: November 1, 2025
4.9
(21)
111
riders
1. Mount Tamalpais & Coastal Trail loop — Mount Tamalpais State Park
35.4km
03:20
840m
840m
Intermediate mountain bike ride. Good fitness required. Suitable for all skill levels.
4.9
(20)
132
riders
2. 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.
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4.5
(4)
71
riders
3. Railroad Grade Fire Road – Fern Creek and spring loop from Mill Valley
42.1km
04:06
1,050m
1,060m
Expert mountain bike ride. Very good fitness required. Suitable for all skill levels.
4.9
(12)
81
riders
4. Fern Creek and spring loop from Mill Valley
25.3km
02:16
560m
560m
Intermediate mountain bike ride. Good fitness required. Suitable for all skill levels.
5.0
(27)
54
riders
5. Bobcat Trail – Marincello Trail loop from Mill Valley
30.4km
02:43
650m
650m
Intermediate mountain bike ride. Good fitness required. Suitable for all skill levels.
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