Prefumo 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: 2 bike crashes were reported on or beside Prefumo Canyon Road along the climb from 2021–2025, 2 of them serious or fatal.

How long and steep is the Prefumo Canyon Road climb?

5.0 miles (8.1 km) at 4.3% on average, climbing 1,142 ft (348 m) from 190 ft to 1,332 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 35.2613, -120.70432, and tops out at Chamise Lane at 35.25369, -120.76425.

Is Prefumo 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.

• Happy Trails RoadCat 3 · 1.0 mi at 10.7% · 561 ft · starts 3.5 mi away
• Baron Canyon Ranch RoadCat 3 · 1.3 mi at 10.5% · 702 ft · starts 3.9 mi away
• Skyview TrailCat 3 · 0.6 mi at 18.6% · 545 ft · starts 3.9 mi away
• El Camino Real from Fox Hollow RoadCat 2 · 4.3 mi at 5% · 1,122 ft · starts 4.5 mi away
• See Canyon RoadCat 2 · 7.4 mi at 3.2% · 1,263 ft · starts 4.5 mi away
• Clark Valley RoadCat 3 · 3.3 mi at 3.5% · 623 ft · starts 5.5 mi away
• Righetti RoadCat 2 · 3.9 mi at 5.3% · 1,099 ft · starts 6.3 mi away
• Morretti Canyon RoadCat 2 · 3.9 mi at 5.9% · 1,211 ft · starts 7.4 mi away