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Big Rock Loop route map
Difficulty: ModerateLoop
California

Big Rock Loop

San Rafael, California

5.2 mi

Distance

1,293 ft

Elev. Gain

2h 18m

Est. Time

Loop

Route Type

Moderate

Difficulty

About This Trail

Big Rock Loop is a loop trail in Marin County, California. It is 5.2 miles long and gains 1,293 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:202 ft
Max:479 ft
Gain:394 ft
Loss:394 ft
Elevation profileA line rising and falling between 202 ft and 479 ft across 5.2 mi along the route, drawn from start to end.202 ft294 ft387 ft479 ft0.0 mi1.3 mi2.6 mi3.9 mi5.2 mi

Elevation at the labelled points along this route
PointDistance from startElevation
Start0.0 mi202 ft
High point2.0 mi479 ft
End5.2 mi202 ft

Trail Details

Route Type
Loop

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 Big Rock Loop
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
Loma Alta and Big Rock Ridge Trail

Loma Alta and Big Rock Ridge Trail

6.7 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

Similar length

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Spot an error in our data on Big Rock Loop?