Kimbark Avenue 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 Kimbark Avenue climb?

1.2 miles (1.9 km) at 9.7% on average, climbing 623 ft (190 m) from 2,293 ft to 2,917 ft. The steepest half kilometre averages 14.6%. That makes it a Category 3 climb.

Where does the climb start and finish?

It starts at 34.22936, -117.41224, where Kimbark Avenue leaves Nedlee Avenue, and ends where the road ends at 34.24539, -117.40742.

Is Kimbark Avenue 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.

• Cleghorn Ridge RoadHC · dirt · 15 mi at 3.9% · 3,054 ft · starts 0.2 mi away
• Canon StreetCat 3 · 1.1 mi at 14.4% · 797 ft · starts 0.9 mi away
• Big Tree Cucamonga RoadHC · dirt · 10 mi at 7.3% · 3,865 ft · starts 2.8 mi away
• Lytle Creek RoadCat 3 · 5.7 mi at 3% · 902 ft · starts 3.4 mi away
• Bailey Canyon Road from Palm AvenueHC · dirt · 8.9 mi at 8.2% · 3,852 ft · starts 4.0 mi away
• Applewhite RoadCat 3 · 1.8 mi at 8.3% · 787 ft · starts 4.0 mi away
• Stockton Flats RoadHC · dirt · 13 mi at 7.1% · 4,856 ft · starts 5.0 mi away
• Sawpit Canyon RoadCat 3 · 2.1 mi at 8% · 886 ft · starts 5.1 mi away