Adobe Canyon 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 Adobe Canyon Road climb?

2.9 miles (4.7 km) at 4.7% on average, climbing 732 ft (223 m) from 459 ft to 1,191 ft. The steepest half kilometre averages 11.1%. That makes it a Category 3 climb.

Where does the climb start and finish?

It starts at 38.43018, -122.55417, and tops out at Stern Trail at 38.43775, -122.51668.

Is Adobe Canyon 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.

• White Oak DriveCat 3 · 1.7 mi at 6.4% · 587 ft · starts 2.9 mi away
• Nelligan RoadCat 3 · 2.6 mi at 7.3% · 994 ft · starts 3.3 mi away
• Cougar LaneCat 3 · 0.9 mi at 17.5% · 843 ft · starts 4.0 mi away
• Los Alamos Road near St. HelenaCat 3 · 1.3 mi at 10.3% · 686 ft · starts 4.1 mi away
• Trinity RoadCat 2 · 3.4 mi at 7.8% · 1,414 ft · starts 4.2 mi away
• Wildwood TrailCat 3 · 1.4 mi at 7.4% · 568 ft · starts 4.5 mi away
• Sonoma Mountain Road near SonomaCat 3 · 2.6 mi at 5.4% · 755 ft · starts 4.5 mi away
• Sonoma Mtn RoadCat 3 · 1.0 mi at 12.7% · 669 ft · starts 4.6 mi away