Grizzly Flat Road Climb from Mount Aukum Road
- long (9.3 km)
- 5.7 mi
- long (9.3 km)
- of climbing (328 m)
- 1,076 ft
- of climbing (328 m)
- average grade
- 3.5%
- average grade
- steepest 500 m
- 9.1%
- steepest 500 m
Elevation profile
From 2,090 ft at the bottom to 3,166 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 Grizzly Flat Road this week
Loading forecast…
Is it safe to bike up Grizzly 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 Grizzly Flat Road
- How long and steep is the Grizzly Flat Road from Mount Aukum Road climb?
- 5.7 miles (9.3 km) at 3.5% on average, climbing 1,076 ft (328 m) from 2,090 ft to 3,166 ft. The steepest half kilometre averages 9.1%. That makes it a Category 2 climb.
- Where does the climb start and finish?
- It starts at 38.64768, -120.68543, where Grizzly Flat Road leaves Mount Aukum Road, and tops out at Diamond Railroad Grade at 38.62111, -120.60023.
- Is Grizzly 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
- Sly Park RoadCat 1 · 12 mi at 3.7% · 2,441 ft · starts 0.9 mi away
- Bucks Bar RoadCat 3 · 2.6 mi at 5.7% · 781 ft · starts 1.0 mi away
- Happy Valley Road near PlacervilleCat 1 · 6.4 mi at 7% · 2,343 ft · starts 3.0 mi away
- Ladies Valley RoadCat 3 · 1.6 mi at 9.5% · 823 ft · starts 3.1 mi away
- Sweeney DriveCat 3 · 3.3 mi at 5.8% · 1,007 ft · starts 3.2 mi away
- Starkes Grade RoadCat 2 · 6.7 mi at 4.2% · 1,490 ft · starts 3.6 mi away
- Clear Creek Road from Rivendale RoadCat 3 · 2.7 mi at 4.2% · 600 ft · starts 3.6 mi away
- Slug Gulch RoadCat 2 · 5.3 mi at 4.9% · 1,362 ft · starts 3.8 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.