Cosumnes Mine Road Climb

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.

How long and steep is the Cosumnes Mine Road climb?

5.5 miles (8.9 km) at 5.5% on average, climbing 1,598 ft (487 m) from 3,219 ft to 4,816 ft. The steepest half kilometre averages 9.6%. That makes it a Category 2 climb.

Where does the climb start and finish?

It starts at 38.66918, -120.53304, where Cosumnes Mine Road leaves Consumnes Mine Road, and tops out on the road at 38.68551, -120.50221.

Is Cosumnes Mine 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.

• Sciaroni RoadCat 3 · 1.8 mi at 9% · 833 ft · starts 0.1 mi away
• Capps Crossing RoadCat 2 · 7.4 mi at 3.6% · 1,417 ft · starts 1.9 mi away
• Oldmine RoadCat 3 · 1.4 mi at 7.1% · 525 ft · starts 2.8 mi away
• Leoni RoadCat 2 · 4.7 mi at 4.7% · 1,168 ft · starts 2.9 mi away
• String Canyon RoadCat 3 · 3.4 mi at 4.8% · 853 ft · starts 3.0 mi away
• Mormon Emigrant Trail near PlacervilleCat 3 · 2.2 mi at 5.8% · 682 ft · starts 3.9 mi away
• Grizzly Flat Road near PlacervilleCat 3 · 2.3 mi at 7.8% · 961 ft · starts 3.9 mi away
• Bonnetti RoadCat 3 · 3.8 mi at 5% · 997 ft · starts 3.9 mi away