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Mount Tam via Collier Trail route map
Difficulty: ExpertLoop
California

Mount Tam via Collier Trail

San Anselmo, California

12.4 mi

Distance

4,715 ft

Elev. Gain

5h 32m

Est. Time

Loop

Route Type

Expert

Difficulty

About This Trail

Mount Tam via Collier Trail is a loop trail in Marin County, California. It is 12 miles long and gains 4,715 feet. It is in or next to Ross, 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:46 ft
Max:764 ft
Gain:1,437 ft
Loss:1,437 ft
Elevation profileA line rising and falling between 46 ft and 764 ft across 12.4 mi along the route, drawn from start to end.46 ft285 ft525 ft764 ft0.0 mi3.1 mi6.2 mi9.3 mi12.4 mi

Elevation at the labelled points along this route
PointDistance from startElevation
Start0.0 mi46 ft
High point5.8 mi764 ft
End12.4 mi46 ft

Trail Details

Route Type
Loop

Official sources & verification

Verify before you go

Where it is

Nearest town:
Ross, 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?

Reviews

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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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Worn Springs Fire Road to Yolanda Trail Loop

Worn Springs Fire Road to Yolanda Trail Loop

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Bald Hill from Phoenix Lake

Bald Hill from Phoenix Lake

4.2 mi
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Stay nearby

Campgrounds near this trail

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