Big Rock Ridge – 680 Trail loop from Novato Hamilton

Mountain biking trails

Big Rock Ridge – 680 Trail loop from Novato Hamilton

Hard

4.6

(6638)

10,623

riders

Big Rock Ridge – 680 Trail loop from Novato Hamilton

04:42

42.0km

1,500m

Mountain biking

Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike. The starting point of the route is accessible with public transport.

Last updated: August 3, 2026

Tips

Your route passes through a protected area

Please check local regulations for:

Loma Alta Open Space Preserve

Waypoints

Start point

Train Station

Get Directions

6.91 km

Big Rock Ridge

Highlight (Segment) • Summit

With 360 degree panoramas at multiple points, perfectly groomed trails, and undulations to keep things interesting (and challenging) this is a great ridge to enjoy for multiple abilities.

Tip by

11.0 km

Big Rock Ridge

Highlight • Summit

Highest point on Big Rock Ridge Fire Road with panoramic views of the Bay, Marin county, and even across the East bay to Mt. Diablo and south to San Francisco. …

Tip by

14.3 km

Big Rock Trail to ridge summit above Lucas Films Studio

Highlight • Summit

Big Rock Trail cuts through Lucas Valley Open Space to reach the 2nd highest point in Marin County. From later winter through early summer the hills are verdant green and …

Tip by

16.8 km

Big Rock -- Lucas Valley Rd Summit

Highlight • Natural Monument

Be careful on the descent, the pavement can get slippery. This is a great trail access spot for MTB and hiking.

Tip by

16.8 km

The Big Rock - Skywalker Ranch

Highlight • Natural Monument

As the name implies, a big bolder marks the crest of Lucas Valley Road above Skywalker Ranch, the elusive retreat and production studios of George Lucas and his various film projects.

Tip by

20.1 km

Loma Alta Summit

Highlight • Summit

Loma Alta literally translates to "high hill" and is the highest point in the Loma Alta Open Space Preserve. A few different dirt roads and trails lead to the bald summit that looks over the surrounding hillsides.

Tip by

24.6 km

680 Trail

Highlight (Segment) • Trail

The 680 Trail in Marin County has access points at the end of Manuel T. Freitas Parkway via the Mission Pass Bike Path and Fawn Drive. The terrain is fun, rolling trails.

Tip by