Patterson Pass Road Climb near Mountain House

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 Patterson Pass Road near Mountain House climb?

4.5 miles (7.3 km) at 5.1% on average, climbing 1,214 ft (370 m) from 384 ft to 1,598 ft. The steepest half kilometre averages 10.5%. That makes it a Category 2 climb.

Where does the climb start and finish?

It starts at 37.71493, -121.56772, and tops out at Patterson Pass at 37.68683, -121.6296.

Is Patterson Pass 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.

• Flynn Road NorthCat 3 · 2.7 mi at 3.9% · 551 ft · starts 5.9 mi away
• South Flynn RoadCat 3 · 2.3 mi at 4.5% · 545 ft · starts 6.1 mi away
• Patterson Pass Road near LivermoreCat 3 · 3.2 mi at 5.4% · 906 ft · starts 6.4 mi away
• Reuss RoadCat 3 · 2.5 mi at 5.8% · 768 ft · starts 6.8 mi away
• Vasco RoadCat 3 · 3.1 mi at 4% · 653 ft · starts 8.4 mi away
• Del Valle Road from Mines RoadCat 3 · 1.6 mi at 6.9% · 584 ft · starts 9.8 mi away
• Del Valle Road near LivermoreCat 3 · 2.2 mi at 5.2% · 600 ft · starts 12 mi away
• Morgan Territory Road near LivermoreCat 2 · 4.6 mi at 6% · 1,463 ft · starts 12 mi away