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Loma Alta and Big Rock Ridge Trail route map
Difficulty: DifficultOut and Back
California

Loma Alta and Big Rock Ridge Trail

San Rafael, California

6.7 mi

Distance

2,162 ft

Elev. Gain

2h 54m

Est. Time

Out & Back

Route Type

Difficult

Difficulty

About This Trail

Loma Alta and Big Rock Ridge Trail is an out-and-back trail in Marin County, California. It is 6.7 miles long and gains 2,162 feet. The nearest town is Lucas Valley-Marinwood, California, about 1 mile away in a straight line.

From the trail data on this page.

Trail Conditions

Trail Conditions

Unknown

We have no current condition data for this trail. Check with the operator before you go, and submit a report below if you've been recently.

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Elevation Profile

Min:195 ft
Max:571 ft
Gain:659 ft
Loss:659 ft
Elevation profileA line rising and falling between 195 ft and 571 ft across 6.7 mi along the route, drawn from start to end.195 ft320 ft446 ft571 ft0.0 mi1.7 mi3.3 mi5.0 mi6.7 mi

Elevation at the labelled points along this route
PointDistance from startElevation
Start0.0 mi198 ft
High point3.3 mi571 ft
End6.7 mi198 ft

Trail Details

Route Type
Out & Back

Official sources & verification

Verify before you go

Where it is

Nearest town:
Lucas Valley-Marinwood, CA · about 1 mi away
County:
Marin County, CA

Nearest town and county from U.S. Census Bureau place records and county boundaries.

We display cached information from agency feeds. Hours, fees, permits, closures, fire restrictions, and conditions change without notice. Outdoors is not the permitting authority. Confirm current conditions for this trail using the links above before you go — you are responsible for compliance. Last verified by us: May 23, 2026. Our copy is more than a month old — please reconfirm with the agency before relying on it.Spot an error in our data?

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Legacy import — verify before navigating

Path geometry came from our pre-launch legacy database. Routes have not yet been re-verified against the operator and may differ from the actual trail.

Nearby Trails

More trails near Loma Alta and Big Rock Ridge Trail
Big Rock Loop

Big Rock Loop

5.2 mi
TrailDifficulty: Moderate
Bay Area Ridge Trail, 680 Trail, and Loma Alta Fire Road Loop

Bay Area Ridge Trail, 680 Trail, and Loma Alta Fire Road Loop

7.8 mi
TrailDifficulty: Difficult
Luiz Fire Trail and Big Rock Ridge

Luiz Fire Trail and Big Rock Ridge

6.3 mi
TrailDifficulty: Difficult

Goat Trail

1.1 mi
TrailDifficulty: Easy
Lucas Valley Loop Trail

Lucas Valley Loop Trail

3.6 mi
TrailDifficulty: Difficult

Spyglass Trail

0.3 mi
TrailDifficulty: Easy

Stay nearby

Campgrounds near this trail

More campgrounds

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