The best MTB trails in Thornewood Open Space Preserve
4.8
(93)
1,368
riders
50
rides
Last updated: October 25, 2025
17
riders
1. Ridge Trail – Borel Hill loop from Portola Valley
30.3km
03:08
800m
800m
Expert mountain bike ride. Good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.
6
riders
2. Bowl Loop Jumps – Arastradero Lake loop from Portola Valley
21.3km
01:46
330m
330m
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
320m
Intermediate mountain bike ride. Good fitness required. Suitable for all skill levels.
5.0
(2)
3
riders
4. Indian Creek Trail – Arastradero Lake loop from Portola Valley
40.6km
03:36
1,050m
1,050m
Expert mountain bike ride. Very good fitness required. Suitable for all skill levels.
4.6
(9)
180
riders
5. Manzanita Trail – Middle Timberview Trail loop from Woodside
24.2km
02:53
900m
900m
Intermediate mountain bike ride. Good fitness required. Advanced riding skills necessary.
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