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Thornhill to Big Rock Ridge route map
Difficulty: ModerateOut and Back
California

Thornhill to Big Rock Ridge

San Rafael, California

2.3 mi

Distance

1,168 ft

Elev. Gain

1h 20m

Est. Time

Out & Back

Route Type

Moderate

Difficulty

About This Trail

Thornhill to Big Rock Ridge is an out-and-back trail in Marin County, California. It is 2.3 miles long and gains 1,168 feet. It is in or next to Novato, California.

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:52 ft
Max:387 ft
Gain:356 ft
Loss:356 ft
Elevation profileA line rising and falling between 52 ft and 387 ft across 2.3 mi along the route, drawn from start to end.52 ft164 ft275 ft387 ft0.0 mi0.6 mi1.2 mi1.7 mi2.3 mi

Elevation at the labelled points along this route
PointDistance from startElevation
Start0.0 mi52 ft
High point1.2 mi387 ft
End2.3 mi52 ft

Trail Details

Route Type
Out & Back

Official sources & verification

Verify before you go

Where it is

Nearest town:
Novato, CA · in or next to town
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.

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Stay nearby

Campgrounds near this trail

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