Big Oak Flat Road Climb from Highway 120
- long (18.3 km)
- 11 mi
- long (18.3 km)
- of climbing (792 m)
- 2,598 ft
- of climbing (792 m)
- average grade
- 4.3%
- average grade
- steepest 500 m
- 7.5%
- steepest 500 m
Elevation profile
From 3,714 ft at the bottom to 6,312 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 Big Oak Flat Road this week
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Is it safe to bike up Big Oak Flat 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 Big Oak Flat Road
- How long and steep is the Big Oak Flat Road from Highway 120 climb?
- 11 miles (18.3 km) at 4.3% on average, climbing 2,598 ft (792 m) from 3,714 ft to 6,312 ft. The steepest half kilometre averages 7.5%. That makes it a Category 1 climb.
- Where does the climb start and finish?
- It starts at 37.82054, -119.91986, where Big Oak Flat Road leaves Highway 120, and tops out at South Landing Road at 37.74788, -119.80639.
- Is Big Oak Flat 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
- Hardin Flat RoadCat 2 · 4.6 mi at 4.5% · 1,096 ft · starts 1.5 mi away
- Cherry Lake Road near SonoraCat 2 · 3.2 mi at 9% · 1,539 ft · starts 4.5 mi away
- Cherry Lake Road near SonoraCat 3 · 4.0 mi at 4.8% · 1,017 ft · starts 4.6 mi away
- Highway 120Cat 2 · 3.2 mi at 6.4% · 1,083 ft · starts 5.2 mi away
- Cherry Lake Road near SonoraCat 1 · 10 mi at 4.9% · 2,612 ft · starts 5.4 mi away
- Old Yosemite Coulterville RoadCat 3 · 1.5 mi at 7.3% · 577 ft · starts 7.6 mi away
- Moore Pilot Ridge RoadCat 3 · 2.6 mi at 6.4% · 873 ft · starts 7.9 mi away
- Old Yosemite Coulterville Road from Bull Creek RoadHC · dirt · 9.7 mi at 5.8% · 2,943 ft · starts 8.1 mi away
Found from OpenStreetMap roads and USGS 3DEP elevation; ranked on shape only. Category 1: 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.