Castlewood Drive 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 Castlewood Drive climb?

2.1 miles (3.4 km) at 6.9% on average, climbing 778 ft (237 m) from 305 ft to 1,083 ft. The steepest half kilometre averages 9.9%. That makes it a Category 3 climb.

Where does the climb start and finish?

It starts at 37.63798, -121.88913, and ends where the road ends at 37.63236, -121.905.

Is Castlewood Drive 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.

• Kilkare RoadCat 3 · 3.5 mi at 3.5% · 643 ft · starts 3.0 mi away
• Utility Service RoadCat 2 · 1.6 mi at 15.9% · 1,345 ft · starts 3.0 mi away
• Vallecitos RoadCat 3 · 2.9 mi at 3.7% · 568 ft · starts 3.3 mi away
• Palomares Road from Niles Canyon RoadCat 3 · 4.4 mi at 4.3% · 1,020 ft · starts 4.2 mi away
• Dublin BoulevardCat 3 · 2.6 mi at 4.6% · 633 ft · starts 5.1 mi away
• Morrison Canyon RoadCat 3 · 2.2 mi at 7.9% · 915 ft · starts 6.3 mi away
• Mill Creek Road from Mission BoulevardCat 2 · 4.3 mi at 6.1% · 1,362 ft · starts 7.2 mi away
• Welch Creek RoadCat 1 · 7.2 mi at 6.5% · 2,503 ft · starts 7.3 mi away