Bonny Doon 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 Bonny Doon Road climb?

6.6 miles (10.6 km) at 5.1% on average, climbing 1,765 ft (538 m) from 39 ft to 1,804 ft. The steepest half kilometre averages 10.4%. That makes it a Category 2 climb.

Where does the climb start and finish?

It starts at 37.00231, -122.1785, where Bonny Doon Road leaves South Fork Liddell Creek Road, and tops out on the road at 37.06541, -122.1468.

Is Bonny Doon 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.

• Smith GradeCat 3 · 1.9 mi at 6.4% · 656 ft · starts 3.0 mi away
• Pine Flat Road from Bonny Doon RoadCat 3 · 3.7 mi at 4.6% · 902 ft · starts 3.1 mi away
• Old School House Gulch RoadCat 3 · 1.1 mi at 12.2% · 715 ft · starts 4.8 mi away
• Felton Empire RoadCat 2 · 3.7 mi at 7.7% · 1,516 ft · starts 6.8 mi away
• Empire GradeCat 1 · 14 mi at 3% · 2,257 ft · starts 6.8 mi away
• El Solyo Heights DriveCat 3 · 1.2 mi at 11.5% · 755 ft · starts 7.0 mi away
• Fanning GradeCat 3 · 1.8 mi at 9.5% · 886 ft · starts 7.3 mi away
• Alba RoadCat 2 · 3.7 mi at 10.4% · 2,028 ft · starts 7.7 mi away