Routes

Planner

Features

Updates

App

Login or Signup

Get the App

Login or Signup

Login or Signup

Routes
Running trails & routes
United States
California
Marin County
Lucas Valley-Marinwood

Loma Alta Summit – Big Rock Ridge loop from Marinwood

Routes
Running trails & routes
United States
California
Marin County
Lucas Valley-Marinwood

Loma Alta Summit – Big Rock Ridge loop from Marinwood

Hard

4.8

(3971)

5,137

runners

Loma Alta Summit – Big Rock Ridge loop from Marinwood

03:39

26.8km

1,060m

Running

Hard run. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels. The starting point of the route is accessible with public transport.

Last updated: April 20, 2026

Tips

Your route passes through a protected area

Please check local regulations for:

Loma Alta Open Space Preserve

Waypoints

A

Start point

Bus stop

Get Directions

1

6.82 km

680 Trail

Highlight (Segment) • Trail

2

10.7 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

3

13.9 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

4

13.9 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

5

13.9 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

6

15.9 km

Upper Big Rock Trail

Highlight (Segment) • Trail

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

7

18.7 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

8

19.4 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

B

26.8 km

End point

Bus stop

Loading

Way Types & Surfaces

Way Types

16.7 km

9.02 km

877 m

159 m

Surfaces

18.5 km

6.16 km

1.03 km

747 m

320 m

Sign up to see more specific route details

Sign up for free

Elevation

Elevation

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

Highest point (560 m)

Lowest point (20 m)

Sign up to see more specific route details

Sign up for free

Weather

Powered by Foreca

Today

Friday 15 May

26°C

10°C

0 %

Additional weather tips

Max wind speed: 20.0 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.

Navigate

Send to Phone

Save

Edit route

Download GPX

Move start point

Print

Share

Embed on a website

Report an Issue

Nearby routes

Easy

1

Petaluma River Park Trail

00:16h

2.41km

0m

Hard

5.0

117

Dipsea Trail

03:03h

22.6km

1,070m

Hard

88

SCA, Bobcat, and Julian Trail Loop

01:58h

15.3km

470m

Hard

56

Matt Davis and Dipsea Trail Loop

01:41h

11.6km

480m

Moderate

50

Coastal, Wolf Ridge, and Miwok Trails Loop

01:02h

8.59km

290m

Hard

44

Miwok and Coastal Trail Loop

01:17h

10.6km

370m

Moderate

39

Shoreline and Bay View Trail Loop

01:32h

13.0km

280m

Moderate

36

Meadows Canyon, Curran & Wildcat Gorge Trail Loop

00:37h

4.96km

150m

Hard

31

Dipsea Race Route

01:53h

14.7km

710m

Moderate

4.0

28

Wildcat Peak Loop

01:11h

9.98km

230m

Moderate

27

Point Pinole Bay View Loop

00:49h

7.77km

40m

Moderate

22

Shoreline and Bay View Trail Loop

01:43h

14.7km

260m

Explore
RoutesRoute plannerFeaturesHikesMTB TrailsRoad cycling routesBikepackingSitemap
B2B
PartnersConnectEmbed routes
Company
PressWhat's NewPioneersProduct UpdatesAmbassadorsAdventure HubCareers
Community
Help GuidesSupportGPX Merge ToolGPX Route VideoHazard AssessmentLive Tracking
Download the app
Follow Us on Socials

© komoot GmbH

Privacy Policy
Terms of Service
Community guidelines
Vulnerability disclosure program
Imprint
Information for law enforcement