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Mountain biking trails

Mountainbike loop from Mill Valley

Mountain biking trails

Mountainbike loop from Mill Valley

Moderate

2.6

(17)

20

riders

Mountainbike loop from Mill Valley

01:16

12.1km

360m

Mountain biking

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

Last updated: October 9, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Blithedale Summit Open Space Preserve

Waypoints

A

Start point

1

404 m

West Blithedale Avenue Trailhead

Highlight • Trail

The wood bridge across the creek marks the beginning of the Old Railroad Grade, today a wide fireroad

Tip by

2

3.32 km

Old Railroad Grade Trail Gate Overlook

Highlight • Viewpoint

Sweeping views south and east, all the way to SF, and Mt Tam right above behind you to the north. The bench is dedicated to the family who built their house in front of you 60 years ago.

Tip by

3

3.43 km

Railroad Grade at Fern Canyon & Summit

Highlight • Trail

Uphill from this intersection a portion of the Railroad Grade has been taken over by Fern Canyon Rd after the Mt Tam railroad closed. A short distance uphill on pavement …

Tip by

4

5.12 km

Former Railroad and Gravity Car Station

Highlight • Historical Site

There are still remnants of old train platforms visible where the Gravity cars used to intersect with the Mt Tam Railroad.

Tip by

5

6.04 km

Old Railroad Grade: Blithedale to Gravity Car

Highlight • Trail

Bottom section of the most gradual route to Mt Tam summit, following the former tourist train that worked it's way up from Mill Valley til the 1930s

Tip by

B

12.1 km

End point

Way Types & Surfaces

Way Types

9.69 km

2.40 km

< 100 m

Surfaces

6.11 km

3.14 km

2.47 km

403 m

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Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

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Weather

Powered by Foreca

Tuesday 20 October

21°C

9°C

0 %

Additional weather tips

Max wind speed: 6.0 km/h

to get more detailed weather forecasts along your route

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