South Fork Mountain Road Climb from Hidden Valley Ranch Road
- long (13.7 km)
- 8.5 mi
- long (13.7 km)
- of climbing (437 m)
- 1,434 ft
- of climbing (437 m)
- average grade
- 3.2%
- average grade
- steepest 500 m
- 7.4%
- steepest 500 m
Elevation profile
From 4,177 ft at the bottom to 5,610 ft at the top. Grades are averaged over each half kilometre, from USGS elevation data, so short ramps can be steeper than they show.
Weather at the top of South Fork Mountain Road this week
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Is it safe to bike up South Fork Mountain Road?
We don't rate roads as safe or unsafe: crash counts can't say how risky a ride is, and roads people like to ride draw more riders, so they see more crashes. What the records show: no bike crashes were reported along the climb from 2021–2025.
Common questions about South Fork Mountain Road
- How long and steep is the South Fork Mountain Road from Hidden Valley Ranch Road climb?
- 8.5 miles (13.7 km) at 3.2% on average, climbing 1,434 ft (437 m) from 4,177 ft to 5,610 ft. The steepest half kilometre averages 7.4%. That makes it a Category 2 climb.
- Where does the climb start and finish?
- It starts at 40.41075, -123.44443, where South Fork Mountain Road leaves Hidden Valley Ranch Road, and tops out on the road at 40.51534, -123.50391.
- Is South Fork Mountain Road paved?
- Yes, by its OpenStreetMap tags.
- How is the category worked out?
- From the climb's shape only: length in metres × average grade (%) of 16,000 or more for Cat 3, 32,000 for Cat 2, 64,000 for Cat 1 and 80,000 for HC. It describes how hard the climb is, not traffic or crashes.
- Where does this data come from?
- The climb is found from OpenStreetMap roads and USGS 3DEP elevation (every climb, not a list of famous ones). Access is from OpenStreetMap tags; gates and closures change, so obey posted signs. Crash counts are police reports in the California Crash Reporting System (CCRS) on data.ca.gov, counted where their map location is within 100 ft of the climb. The forecast is from the National Weather Service.
Other climbs nearby
- 94th StreetCat 3 · 1.2 mi at 8.6% · 558 ft · starts 1.6 mi away
- Feldmiller RoadCat 1 · dirt · 4.3 mi at 10% · 2,283 ft · starts 3.1 mi away
- Miller Place RoadCat 2 · 4.9 mi at 6.7% · 1,736 ft · starts 3.7 mi away
- Lakeview Drive from Mad River RoadCat 3 · 0.8 mi at 13% · 538 ft · starts 3.8 mi away
- Berry Summit-Mad River Road from Lamb RoadHC · 7.0 mi at 8.4% · 3,084 ft · starts 4.1 mi away
- Lamb RoadCat 3 · 1.6 mi at 7.9% · 686 ft · starts 4.2 mi away
- Senteney Rock RoadHC · dirt · 7.5 mi at 6.7% · 2,644 ft · starts 4.3 mi away
- Mule Ridge RoadHC · dirt · 9.9 mi at 5.1% · 2,687 ft · starts 5.0 mi away
Found from OpenStreetMap roads and USGS 3DEP elevation; ranked on shape only. Category 2: length in metres × average grade (%) of 16,000 or more for Cat 3, 32,000 for Cat 2, 64,000 for Cat 1 and 80,000 for HC. It describes how hard the climb is, not traffic or crashes. Crashes: bike crashes reported within 100 ft of the climb, 2021–2025, from the California Crash Reporting System (CCRS), counted only where the report has map coordinates. Weather: National Weather Service. Access from OpenStreetMap tags; obey posted signs. How the data works.