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Routes
Mountain biking trails
United States
California
Marin County
Mill Valley

Fern Creek and spring – Railroad Grade Fire Road loop from Mill Valley

Routes
Mountain biking trails
United States
California
Marin County
Mill Valley

Fern Creek and spring – Railroad Grade Fire Road loop from Mill Valley

Hard

3.2

(11)

81

riders

Fern Creek and spring – Railroad Grade Fire Road loop from Mill Valley

03:42

43.6km

970m

Mountain biking

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

Last updated: April 27, 2026

Tips

Temporary access restrictions

Includes segments with temporary access restrictions.

After 34.4 km for 123 m

Customers only

Waypoints

A

Start point

Bus stop

Get Directions

1

7.69 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

2

8.62 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

3

9.99 km

Fern Creek and spring

Highlight • River

Delicious water emerging from the rock wall just past the creek along the fire road

Tip by

4

10.4 km

Railroad Grade Fire Road Overlook to San Francisco

Highlight • Viewpoint

On clear days views open up along the trail across the bay and including the San Francisco skyline

Tip by

5

11.1 km

Flowy downhill section above Laguna Creek

Highlight • Trail

After looping around West Point the Railroad Grade trail snakes through open and tree-lined sections with fun curves.

Tip by

11.4 km

Mount Tamalpais West Point

Peak

7

12.3 km

Railroad Grade Fire Road

Highlight • Trail

This is a great gravel road that takes you from the summit of Mount Tam to West Point. The road is wide and not very technical, but the views south across the foothills to Muir Woods are fantastic.

Tip by

8

21.1 km

Rock Springs – Lagunitas Road 🚵

Highlight (Segment) • Trail

Great hiking and mountain biking on this gravel fire road in Mt Tamalpais watershed. It descends steeply to Lake Lagunitas from the shady forested intersection with Rocky Ridge Road (and …

Tip by

B

43.6 km

End point

Bus stop

Loading

Way Types & Surfaces

Way Types

16.6 km

12.3 km

7.93 km

5.39 km

815 m

525 m

< 100 m

Surfaces

21.3 km

11.0 km

6.10 km

4.79 km

384 m

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Elevation

Elevation

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

Highest point (740 m)

Lowest point (0 m)

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Weather

Powered by Foreca

Today

Tuesday 26 May

21°C

11°C

0 %

Additional weather tips

Max wind speed: 28.0 km/h

to get more detailed weather forecasts along your route

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

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