Mt. Hamilton West Bike Climb - PJAMM Cycling






Mt. Hamilton West

CA, USA

The longer, more popular and easier of the two ascents in the East Bay up to Hamilton Observatory.

Explore this Climb

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LOCAL WEATHER

Start
Finish

Currently

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56
°F
°C

Clear


wind:
3.2 mph SSE with gusts up to 6 mph

rain:
0% chance of light rainfall

10:22 AM (local)
PJAMM Sunrise Icon7:05 AMPJAMM Sunset Icon7:23 PM

Temperature
Precipitation
Wind Speed

Sun

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69° 48°

Mon

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64° 51°

Tue

pjamm cycling partly-cloudy-day weather icon

64° 51°

Wed

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55° 47°

Thu

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60° 45°

Fri

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67° 44°

Sat

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69° 46°

Climb Summary


Cycling Mt. Hamilton - Lick Observatory aerial drone photo at sunset

Cycling Mt. Hamilton East and West - a top Santa Clara County road bike climb.

Lick Observatory at sunset.

Mt. Hamilton is a popular bike climb out of the San Jose/Silicon Valley section of Northern California’s Bay Area.  

Beginning of Mt. Hamilton West bicycle climb

Sunset from Lick Observatory

Mt. Hamilton West

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 4.0% 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%.  

Beginning of Mt. Hamilton West bicycle climb

Start climb in Alum Rock, east of San Jose

Open fields on bike climb to Lick Observatory Santa Clara County.

It doesn’t take long to reach rural land.

As we begin our climb, we have many excellent views of Northern California’s San Jose and Silicon Valley to the west and southwest.  Within a couple of miles we essentially leave civilization behind (if one can really do that 10 miles from the Silicon Valley, but that’s what it feels like, anyway) and we are soon passing through grassy oak studded fields.  The last 6 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 6 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.)

The summit for the Mt. Hamilton West climb is the Lick Observatory, owned and operated by the University of California and 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).

Biking Mt. Hamilton West - Lick Observatory entrance.

Lick Observatory at the top of the climb.

   Dome of the Lick Observatory after Mt. Hamilton bike bicycle ride.

Roadway surface and Traffic:  The roadway surface is excellent and the traffic is mild to moderate, depending on the time of the week - 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 and 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 our 2 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!).

Mt. Hamilton East

The Climb Less Traveled - well, at least by comparison to Mt. Hamilton West, anyway:  For those intent on maximizing their elevation and minimizing their miles, the 46 mile out-and-back starting from Alum Rock Blvd / Mt. Hamilton Rd / San Antonio Rd and back is the way to go - our Garmin read 6,421’ of climbing at the end of that out-and-back.  

Beginning of Mt. Hamilton East road bike climb - road sign and road.

Start the climb where the

Curvy roadway on climb up Mt. Hamilton east to Lick Observatory Silicon Valley

This is the middle climbing segment of the popular, but brutal, Devil Mountain Double which is held in April each year. This climb has close to double the pitch as the “front” side of Hamilton (this ascent is referred to locally as Hamilton Backside) at 8.3% and is quite challenging.  The views predominantly to the north as we climb are of hundreds of miles of the Diablo Mountain Range.  This climb ends .7 miles short of Hamilton West as this final stretch is rollers with -62’ with only +27’ for that stretch.

Roadway surface and traffic:  The roadway is wide (but with no bike lane) and in excellent condition.  Traffic is not a problem - this is an excellent and safe climb.

AMGEN TOUR OF CALIFORNIA

Mt. Hamilton is the most featured mountain climb in the history of the Tour of California, having been featured 6 times between 2006-2019.  Mt. Hamilton has never been a mountain-top finish in the ToC.

  • 2008  Stage 3:
  • Queen Stage - Modesto - San Jose
  • 102.7 mile, 8,039’; eastern approach
  • Stage winner Robert Gesink (NED)
  • 2011 Stage 4
  • Livermore to San Jose
  • 81.8 miles, 8,337’; eastern approach
  • Chris Horner (USA)
  • 2014 Stage  3 
  • San Jose to Mount Diablo
  • 107 miles, 10,574’; western approach
  • Lawson Craddock (USA)
  • 2015   Stage 3
  •  East San Jose - San Jose
  • 105.5 miles  10,200’; eastern approach
  • Toms Skujiņš (LAT)
  • 2017 - Stage 2 
  • Modesto to San Jose
  • 89.8 miles, 8,064; eastern approach
  • Rafal Majka (POL)
  • 2019 - stage 3 May 14
  • East Stockton to Morgan Hill
  • 128.6 miles

2019 Stage 3 Profile - May 14, 2019 - 128 miles / elev. Gain 9,667’

Peloton makes its way up Mt Hamilton West - 2014 stage 3