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Hiking trails & Routes

United States

California

Marin County

Lucas Valley-Marinwood

Big Rock Ridge – Big Rock Ridge loop from Mount McKinley Road & Idylberry Road

Routes

Hiking trails & Routes

United States

California

Marin County

Lucas Valley-Marinwood

Big Rock Ridge – Big Rock Ridge loop from Mount McKinley Road & Idylberry Road

Hard

3.5

(9)

hikers

Big Rock Ridge – Big Rock Ridge loop from Mount McKinley Road & Idylberry Road

07:15

22.7km

940m

Hiking

Hard hike. Very good fitness required. Easily-accessible paths. Suitable for all skill levels. The starting point of the route is accessible with public transport.

Last updated: April 8, 2026

Tips

Your route passes through a protected area

Please check local regulations for:

Loma Alta Open Space Preserve

Waypoints

Start point

Bus stop

Get Directions

2.36 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

6.49 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

7.49 km

Lucas Valley Open Space Preserve

Highlight • Natural

The wide firm gravel fire roads are bikeable and worth it for the fantastic views, though getting up on the ridge is a bit steep. No access via Skywalker Ranch road.

Tip by

9.76 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

12.3 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

12.3 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

12.3 km

Bay Area Ridge Trailhead

Highlight • Trail

There is plenty of street parking at this trailhead, with the amazing Big Rock nearby to make it easy to spot. The Bay Area Ridge Trail runs along the ridgelines …

Tip by

16.6 km

680 Trail

Highlight (Segment) • Trail

This trail can be the starting point or end to a nice hike through the preserve, connecting to the Terra Linda Trail and several other side trails. It is a …

Tip by

22.7 km

End point

Bus stop

Way Types & Surfaces

Way Types

11.8 km

9.30 km

1.21 km

359 m

Surfaces

13.4 km

7.73 km

1.21 km

359 m

Elevation

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

Highest point (560 m)

Lowest point (40 m)

Weather

Sunday 28 June

25°C

11°C

0 %

Additional weather tips

Max wind speed: 17.0 km/h

to get more detailed weather forecasts along your route

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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Big Rock Ridge – Big Rock Ridge loop from Mount McKinley Road & Idylberry Road

Big Rock Ridge

Big Rock Ridge

Lucas Valley Open Space Preserve

Big Rock Trail to ridge summit above Lucas Films Studio

Big Rock -- Lucas Valley Rd Summit

The Big Rock - Skywalker Ranch

Bay Area Ridge Trailhead

680 Trail

Nearby routes

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