Loma Alta Summit – 680 Trail loop from Marin

United States

California

Marin County

Loma Alta Summit – 680 Trail loop from Marin

Hard

4.7

(6519)

6,520

riders

Loma Alta Summit – 680 Trail loop from Marin

01:33

15.9km

490m

Gravel riding

Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

Last updated: August 19, 2026

Tips

Your route passes through a protected area

Please check local regulations for:

Loma Alta Open Space Preserve

Waypoints

Start point

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93 m

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.

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95 m

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.

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160 m

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 …

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3.35 km

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.

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5.72 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 …

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7.89 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.

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