Mt. Tam via Alpine Dam Bike Climb - PJAMM Cycling

Mt. Tam via Alpine Dam


Our favorite route to Mt. Tam's western peak.

Explore this Climb

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Climb Summary

Cycling Mt. Tamalpais (Mt. Tam), Marin County from Alpine Dam

View of San Francisco from Mt. Tam’s West Peak

California Top 10 Most Scenic Bike Climb

This climb is one of the five primary climb routes to the top of Mt. Tamalpais in Marin County, and may be the most scenic of them all.  The climb is mild throughout, and as with most Marin roads, it is in great shape.  There is no shoulder to speak of, but motor vehicle traffic is light and not a real issue during this climb, you will likely encounter at least twice the number of cyclists as motorists in this part of Marin.  

We believe that this bike climb is one of the most scenic in California and the US. There are three segments to Alpine Dam to Mt. Tam road bike climb.


The first 2.5 miles to the intersection of Bolinas Fairfax Road and Ridgecrest Boulevard are at a 6% average grade, gaining 867' and along a narrow roadway bordered by redwood trees with minimal traffic.  This is a very pleasant climb segment.  

Bike climb Mt. Tamalpais from Alpine Dam - sign at Alpine Dam

Start of climb: Alpine Lake left, front of dam right.

Bike ride Mt. Tamalpais from Alpine Dam - aerial drone photo of ridgeline and Alpine Lake

Alpine Lake (dam is photo middle left) is created by Alpine Dam (built 1917).

The surface area is 224 acres, with water volume of 8,892 acre feet.

Bike climb Mt. Tamalpais from Alpine Dam - road surrounded by redwood trees

The steepest ½ mile (9%) is on this segment.

Right to Bolinas Bay/Stinson Beach,

Left to Mt. Tam.


Beginning of the second segment.

Ride four miles at 2.4%.

Views open up at mile three.

Ride atop a true ridgeline for 2½ miles at 3% average grade.

Some stunning views on this segment (Bolinas Bay to the left).

Alpine Dam as seen from 1600’ above the ridgeline.

View north: photo left center is where the views open up.

Aerial view of the southern portion of the three mile ridgeline ride.


The final leg up to the top of Mt. Tam West Peak is 1.5 miles at 6.5%, with a gain of 517'.  The views of San Francisco and the Bay along this segment are absolutely spectacular -- the best anywhere, in our opinion.

Pass the entrance to the old Cold War Air Force Station ¼ mile from the top.

We took a detour to the old radar dome (note that the road is marked “no trespass”).

San Francisco is left center of photo.


Cycling Mt. Tamalpais from Alpine Dam - view of SF Bay through bike frame 


Sutro Tower, San Francisco.

That’s a wrap . . . for Mt. Tam anyway . . .

Drone aerial photo above the Golden Gate Bridge

And we are just a stone’s throw from the Golden Gate and San Francisco.

Drone aerial photo above the Golden Gate Bridge

Drone aerial photo above the Golden Gate Bridge

Visit the Marin Museum of Bicycling in Fairfax on your way to the start of the climb.

Drone aerial photo above the Golden Gate Bridge