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Mountain biking trails

Gravity Car Fire Rd Trail loop from Mill Valley

Routes

Mountain biking trails

Gravity Car Fire Rd Trail loop from Mill Valley

Moderate

3.1

(10)

riders

Gravity Car Fire Rd Trail loop from Mill Valley

01:33

18.8km

370m

Mountain biking

Moderate mountain bike ride. Good fitness required. Suitable for all skill levels. The starting point of the route is accessible with public transport.

Last updated: August 28, 2026

Tips

Your route passes through a protected area

Please check local regulations for:

Blithedale Summit Open Space Preserve

Waypoints

Start point

Bus stop

Get Directions

5.01 km

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

7.93 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

8.04 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 brings you to the end of Fern Cyn. A bit before the end the Railroad Grade gravel forest road splits off again to the right. The Temalpa Trail that joins here is steep with stairs, not open to biking.

Tip by

9.73 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

9.89 km

Gravity Car Fire Rd Trail

Highlight (Segment) • Trail

Gravity Car Fire Road is a short section of trail connecting the Mountain Home Trail Head at Panoramic Highway with the Old Railroad Grade going up to Mt Tam. While the train was in operation 1896-1930 a branch would go down to Muir Woods National Park. The first portion of that branch is now the Gravity Car Trail. It is very gradual and thus perfect for biking.

Tip by

18.8 km

End point

Bus stop

Way Types & Surfaces

Way Types

7.22 km

5.30 km

3.72 km

1.79 km

702 m

< 100 m

Surfaces

6.92 km

4.28 km

3.05 km

2.47 km

1.51 km

352 m

Elevation

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

Weather

Monday 31 August

18°C

11°C

-- %

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Comments

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Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.

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Gravity Car Fire Rd Trail loop from Mill Valley

West Blithedale Avenue Trailhead

Old Railroad Grade Trail Gate Overlook

Railroad Grade at Fern Canyon & Summit

Former Railroad and Gravity Car Station

Gravity Car Fire Rd Trail

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