Steepest Gradient (%)
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Cycling Mt. Hamilton West is the most popular bike climb in Santa Clara County
Ride 18.4 miles gaining 4,300’ at 4% average grade.
Over 10,000 Strava members have climbed Hamilton as of April, 2020
Mt. Hamilton is the most popular bike climb in the South Bay and has been featured in more Tour of California races than any other climb (see Tour of California section below). On any given day, particularly weekdays, you are bound to see many cyclists on this very fun road bike climb. This is a Bay Area Top 10 Most Scenic Bike Ride
Final mile to the summit.
Mt. Hamilton from the west is also the longest climb in the Bay Area, by a good stretch over Napa County’s Mt. St. Helena (18.2 v. 11.5 miles).
Both sides of Mt. Hamilton end amidst University of California observatories.
This is the more popular, but more gradual, of the two Mt. Hamilton climb segments. According to Strava, as of May 2015, there had been 12,230 attempts by 5,017 riders up the west side while only 3,913 attempts by 1,979 riders from the east. The grade throughout the climb is fairly mild, although the overall 4% average grade for the 18.3 mile climb is a bit deceiving, as there are 558’ of descent included in that average. If we remove the 2.5 miles of descent (at an average -2.5%), the climb averages about 5%.
Start climb in Alum Rock, east of San Jose.
As we begin our climb (and for the first 4 miles), we have many excellent views of Northern California’s San Jose and Silicon Valley to the west and southwest.
Just about one mile up the climb, San Jose is seen in the background.
San Jose is in view to the right the first few miles of the climb.
Within a couple of miles we feel as though we have left civilization behind (as much as one can really do that 10 miles from the Silicon Valley) and are soon passing through farmland and rolling oak-studded hills.
The last six miles are up the mountain and through a series of switchbacks with a grade that increases to 5.7% on average for those final miles. Since the road was constructed between 1876 and 1887 with materials transported by horse and mule-drawn wagons, the grade could not be too steep, hence the many switchbacks and turns up the six mile ascent. It is reported that there are approximately 365 turns on the roadway -- see Wikipedia-Lick Observatory for an excellent history of the Lick Observatory and Mt. Hamilton West.
Mt. Hamilton West generally consists of three separate climbs:
Views of San Jose along the first few miles of Climb 1.
Pasutre for much of the second half of Climb 1.
Climb 1 is followed by a 1.8 mile descent.
The hills are studded with oak trees along this ride.
Start of Climb 3.
Mt. Umunhum is visible as we climb the final segment of Mt. Hamilton West.
THE HAIRPINS OF MT. HAMILTON
“Tradition maintains that this road has exactly 365 turns” Wikipedia
This is one winding mountain road!
LICK OBSERVATORY - THE TOP
Lick Observatory is in view for much of the last half of the climb
We first see the observatory at mile 11 (top left photo)
The summit for the Mt. Hamilton West climb is the Lick Observatory, owned and operated by the University of California, this is the world’s first permanently occupied mountain-top observatory (the sign on the first building we come to at the top says “Residents Dining Hall” -- inactive as of 2015).
Lick Observatory at the top of the climb.
Roadway Surface and Traffic Report: The roadway surface is excellent and the traffic is mild to moderate, depending on the time of the week. Of course, weekends are busier as there are exceptional views from the observatory, which is open to the public from Thursdays through Sundays noon to 5 p.m. (as of May 2015).
Mt. Hamilton is in the Diablo Mountain Range. It is reported that on clear days one can see the Santa Cruz Mountains, Monterey Bay, and Yosemite National Park (see, Wikipedia - Mt. Hamilton). Unfortunately, on two of our times up Mt. Hamilton we were in the clouds much of the trip, and on the other we were suffering at about the halfway point of the Devil Mountain Double (not a time to truly relax and enjoy the views!).
Before heading out to cycle Mt. Hamilton, be sure to rely on our list of Things to Bring on a Cycling Trip, and use our interactive checklist to ensure you don't forget anything.
AMGEN TOUR OF CALIFORNIA
Mt. Hamilton is the most featured mountain climb in the history of the Tour of California, having been featured six times between 2006-2019. Mt. Hamilton has never been a mountain-top finish in the ToC. (Note that ToC is on hiatus for 2020.)
2019 Stage 3 Profile: May 14, 2019, 128 miles / elevation gain 9,667’
Peloton makes its way up Mt Hamilton West -- 2014 Stage 3.
MT. HAMILTON AT SUNSET
Sunset from Lick Observatory.
Truly a sight to behold.