Mountain House 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 Mountain House Road climb?

2.2 miles (3.5 km) at 5.8% on average, climbing 666 ft (203 m) from 554 ft to 1,220 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 38.90093, -123.08935, and tops out at Highway 128 at 38.8756, -123.10548.

Is Mountain House 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.

• Highway 128Cat 3 · 1.7 mi at 6% · 541 ft · starts 3.0 mi away
• Duncan Springs RoadCat 3 · 1.2 mi at 8.2% · 531 ft · starts 4.1 mi away
• Hopland GradeCat 2 · 8.8 mi at 4.3% · 2,008 ft · starts 5.3 mi away
• Nokomis RoadCat 2 · 2.4 mi at 10.9% · 1,404 ft · starts 5.9 mi away
• Pratt Ranch near LakeportCat 3 · 1.8 mi at 9.5% · 892 ft · starts 6.1 mi away
• Pratt Ranch RoadCat 3 · 1.1 mi at 10.7% · 617 ft · starts 6.9 mi away
• Pine Mountain RoadCat 1 · 7.8 mi at 6.2% · 2,552 ft · starts 7.2 mi away
• Pratt Ranch near LakeportCat 2 · 1.6 mi at 14.1% · 1,175 ft · starts 7.3 mi away