Glass 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 Glass Road climb?

2.2 miles (3.6 km) at 7.6% on average, climbing 902 ft (275 m) from 5,410 ft to 6,312 ft. The steepest half kilometre averages 8.9%. That makes it a Category 3 climb.

Where does the climb start and finish?

It starts at 34.18411, -116.90741, where Glass Road leaves Santa Ana River Road, and tops out at Detective Jeremiah MacKay Memorial Highway at 34.16893, -116.89308.

Is Glass 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.

• Radford Truck TrailCat 1 · dirt · 5.1 mi at 9.2% · 2,493 ft · starts 0.6 mi away
• Seven Oaks RoadCat 3 · 3.0 mi at 3.8% · 600 ft · starts 2.6 mi away
• Clark's GradeHC · dirt · 7.3 mi at 7.7% · 2,953 ft · starts 2.7 mi away
• Valley of the Falls DriveCat 2 · 4.0 mi at 6.9% · 1,437 ft · starts 6.8 mi away
• Greenspot BoulevardCat 2 · 8.9 mi at 3.7% · 1,719 ft · starts 7.2 mi away
• Thomas Hunting Grounds RoadHC · dirt · 9.4 mi at 6% · 3,009 ft · starts 8.8 mi away
• Green Valley Lake RoadCat 3 · 4.5 mi at 3.4% · 814 ft · starts 9.7 mi away
• Pine Bench RoadCat 3 · 2.0 mi at 6.7% · 709 ft · starts 10 mi away