Pine Flat Road Bike Climb - PJAMM Cycling

Pine Flat Road


Hands down one of the toughest Sonoma County cvlimbs!

Photos By: Maxfield Bonta

Explore this Climb

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3.6 mph SE with gusts up to 12.7 mph

28% chance of light rainfall

9:19 AM (local)
PJAMM Sunrise Icon7:12 AMPJAMM Sunset Icon7:25 PM

Wind Speed


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54° 44°


pjamm cycling partly-cloudy-day weather icon

60° 42°


pjamm cycling cloudy weather icon

62° 47°


pjamm cycling rain weather icon

53° 41°


pjamm cycling cloudy weather icon

59° 49°


pjamm cycling rain weather icon

50° 45°


pjamm cycling clear-day weather icon

59° 42°

Climb Summary

Climbing Pine Flat Road by bike - aerial drone photo of roadway, hillside, mountains and vineyards.

Cycling Pine Flat Road - Sonoma County’s 4th difficult bike climb

Ride 11.2 miles to 3,158’ gaining 3,589’ at 4.9% average grade.

This climb ranks #7 on the Tri-County Top 25 list with a Fiets Index of 4.44. The  first  7 miles of Pine  Flat (to “the guardrail” as the locals refer to it) are a modest ascent at 5.5% average grade which is  followed by  2.1 miles that actually averages -0.8% grade (perhaps where the  "flat" part of the  road's name comes from).  The biggest challenge of this  climb comes towards  the end, with the  last 2.2 miles averaging 9.2% and 1.1  mile at the beginning of  that stretch averaging 11.4% (20%  for a brief time on  "The Wall" at the 10.1 mile  mark.) The upper portion of the ride approaches  The Geysers area and can be  torturously hot in the summer.  

Pine Flat is located in the Mayacamas Mountains which stretch 52 miles from Clear Lake to northern Sonoma and Napa counties.

Bike ride up Pine Flat Road - aerial drone photo of start and vineyards 

Looking back from the start via drone aerial photo.

Climbing Pine Flat Road by bike - cyclist on road

First stretch of Pine Flat Road

Biking up Pine Flat Road - cyclist on the wall, roadway

Cyclist on The Wall

   Biking up Pine Flat Road - Garmin showing steep grade

Read it and weep - the Garmin don’t lie!

Bicycle climb of Pine Flat Road - cyclist on the roadway on bikes with road and power lines

Section just after The Wall.

 Cycling Pine Flat Road - cyclist on road with power pole

 The first 5 1/2 miles (to the pond) offer magnificent vineyard views along Pine Flat Road, while the next 1 1/2 miles  give us views of the Alexander Valley to the west, Mt. St. Helena to the southeast (photo) and, if we look  carefully and know what we are looking for, Mt. Tamalpais to the south (photo).

Supplies:  The Jimtown store is less than a mile from the start of the ride.  

Roadway surface/Traffic:  The roadway is in decent condition at the bottom,  with  moderate  deterioration towards the top.  Caution is required for the  decent as the  upper portion of the  mountain is very steep with rough road,  sharp turns and  gravel in many locations.  Traffic over the  entire climb is  minimal.