Rio 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 Rio Road climb?

4.1 miles (6.6 km) at 3.1% on average, climbing 676 ft (206 m) from 259 ft to 935 ft. The steepest half kilometre averages 10.7%. That makes it a Category 3 climb.

Where does the climb start and finish?

It starts at 36.2968, -121.16639, and tops out on the road at 36.32483, -121.12491.

Is Rio Road paved?

Mostly: OpenStreetMap tags 64% of the climb as paved, and the rest as dirt or gravel.

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.

• King City RoadCat 2 · 8.7 mi at 3% · 1,407 ft · starts 5.3 mi away
• Pine Canyon Road from SiraksCat 1 · 10 mi at 4.1% · 2,159 ft · starts 7.0 mi away
• Via CanadaCat 2 · 4.0 mi at 5.8% · 1,234 ft · starts 7.7 mi away
• Shirtail Canyon RoadCat 2 · 7.3 mi at 4.5% · 1,729 ft · starts 10 mi away
• Paraiso Springs RoadCat 3 · 4.7 mi at 3.5% · 853 ft · starts 11 mi away
• Paloma Ridge Truck TrailHC · dirt · 8.4 mi at 8.8% · 3,891 ft · starts 12 mi away
• Bryant Canyon RoadCat 3 · 3.3 mi at 5.8% · 997 ft · starts 13 mi away
• Chalone Creek RoadCat 3 · 2.0 mi at 6% · 627 ft · starts 14 mi away