The best MTB trails in Thornewood Open Space Preserve
4.8
(93)
1,449
riders
52
rides
Last updated: September 18, 2025
17
riders
1. Ridge Trail – Borel Hill loop from Portola Valley
30.3km
03:08
800m
Expert mountain bike ride. Good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.
7
riders
Intermediate mountain bike ride. Good fitness required. Suitable for all skill levels.
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5
riders
3. Arastradero Lake loop from Portola Valley
27.3km
01:42
320m
Intermediate mountain bike ride. Good fitness required. Suitable for all skill levels.
4.6
(9)
180
riders
Intermediate mountain bike ride. Good fitness required. Advanced riding skills necessary.
5.0
(2)
31
riders
5. Stevens Creek Nature Trail loop from Portola Valley
27.3km
03:27
730m
Expert mountain bike ride. Good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.
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