Mt. St. Helena Bike Climb - PJAMM Cycling






Mt. St. Helena

CA, USA

The most difficult climb in the North Bay - 360 degree unobstructed views at the peak.

Explore this Climb

PJAMM Cycling LogoDark Sky logo
LOCAL WEATHER

Start
Finish

Currently

pjamm cycling partly-cloudy-day weather icon
54
°F
°C

Partly Cloudy


wind:
1.9 mph SSE with gusts up to 7 mph

rain:
0% chance of light rainfall

10:58 AM (local)
PJAMM Sunrise Icon7:08 AMPJAMM Sunset Icon7:26 PM

Temperature
Precipitation
Wind Speed

Sun

pjamm cycling partly-cloudy-day weather icon

63° 47°

Mon

pjamm cycling rain weather icon

56° 44°

Tue

pjamm cycling rain weather icon

58° 48°

Wed

pjamm cycling rain weather icon

56° 45°

Thu

pjamm cycling rain weather icon

54° 40°

Fri

pjamm cycling clear-day weather icon

67° 43°

Sat

pjamm cycling clear-day weather icon

72° 47°

Climb Summary


Climb summary

DSC00520.JPG

This climb ranks #1 (by a long stretch) on the Sonoma-Napa-Lake County Top 25 list with a  Fiets Index of 7.23 (well beyond its closest competition, Bald Mountain,  Socrates Mine Road and Geysers Road). The first 6 miles are paved (3  miles on Old Lawley Toll Road and 3 miles on Hwy 29) and averages a  respectable 6% which is fairly steady throughout, particularly on Hwy 29.  

DSC05608.JPG      DSC05635.JPG

Old Lawley Toll Road Segment

IMG_6162.JPGIMG_6164.JPG


The second half of the climb is on a fire road consisting of dirt and gravel  which is easily manageable for the first couple of miles on a road bike, but becomes  steeper and softer/looser as you climb and is particularly difficult over a .2  mile 13.9% stretch just before the summit.  We used a Specialized  Roubaix with 28mm tires, 30t cassette and compact crankset and barely  made it up the final stretch.  It is recommended that  the gravel/rock portion of this climb only be attempted on a cross or mountain bike.  

DSC05673.JPG     IMG_0002.JPG

Traffic/Roadway surface:  The road is good for the first 6 miles but  does become dirt, gravel and rocky over the final 5.5 miles to the summit.    There is minimal traffic on Old Lawley Toll Road, moderate traffic on Hwy  29 and no traffic once you turn onto the gravel fire road.  Caveat - we are  not sure if the first mile of the fire road (which we take in lieu of the hiking  trail at the entrance to
Robert Louis Stevenson State Park) is private  property.

IMG_2313.JPG      IMG_2298.JPG 

Steepest ¼ mile starts at the last ¼ mile (12.3%)