Poso Flat 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 Poso Flat Road climb?

2.5 miles (4.0 km) at 10% on average, climbing 1,302 ft (397 m) from 2,408 ft to 3,711 ft. The steepest half kilometre averages 14.2%. That makes it a Category 2 climb.

Where does the climb start and finish?

It starts at 35.61828, -118.72987, and tops out on the road at 35.62142, -118.69213.

Is Poso Flat 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.

• Poso Flat RoadCat 3 · 3.0 mi at 3.7% · 584 ft · starts 0.4 mi away
• Poso RoadCat 2 · 2.9 mi at 10.9% · 1,683 ft · starts 2.7 mi away
• Rancheria RoadCat 1 · dirt · 14 mi at 3.3% · 2,513 ft · starts 4.1 mi away
• Ramel Lynn RoadCat 3 · 2.2 mi at 6.2% · 722 ft · starts 5.2 mi away
• Whites Mill RoadCat 1 · 5.6 mi at 7.3% · 2,146 ft · starts 6.1 mi away
• Evans Road from Bakersfield-Glennville RoadHC · 15 mi at 3.8% · 3,140 ft · starts 6.5 mi away
• Delonegha 4WD TrailCat 1 · dirt · 3.4 mi at 13.9% · 2,487 ft · starts 7.9 mi away
• Granite Road near McFarlandCat 2 · 8.4 mi at 4.3% · 1,893 ft · starts 8.3 mi away