Conzelman 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: 10 bike crashes were reported on or beside Conzelman Road along the climb from 2021–2025, 1 of them serious or fatal. The most were at Alexander Ave & Conzelman Road (4). Of the 6 where the cyclist's direction along the climb can be read, 4 were coming down and 2 going up.

1. 4 crashes · 1 serious or fatal

   Alexander Ave & Conzelman Road

   Falls and fixed objects

   2 of 4 crashes were a fall or hitting an object, with no other vehicle involved.

   See it on the map
2. 3 crashes

   Alexander Ave & Bunker Road

   Falls and fixed objects

   2 of 3 crashes were a fall or hitting an object, with no other vehicle involved.

   See it on the map

How long and steep is the Conzelman Road climb?

3.1 miles (4.9 km) at 4.7% on average, climbing 751 ft (229 m) from 62 ft to 814 ft. The steepest half kilometre averages 8%. That makes it a Category 3 climb.

Where does the climb start and finish?

It starts at 37.84699, -122.48, where Conzelman Road leaves 2nd Street, and tops out at Hawk Hill at 37.82756, -122.49899.

Is Conzelman 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.

• Shoreline Highway near SausalitoCat 3 · 3.2 mi at 3.5% · 594 ft · starts 3.1 mi away
• Countyview DriveCat 3 · 0.9 mi at 13.9% · 630 ft · starts 3.3 mi away
• Glen Fr RoadCat 3 · 2.0 mi at 7% · 722 ft · starts 5.2 mi away
• Shoreline Highway from Pacific WayCat 3 · 2.0 mi at 5.6% · 600 ft · starts 5.3 mi away
• Summit AvenueCat 3 · 1.6 mi at 7.9% · 676 ft · starts 5.7 mi away
• Muir Woods RoadCat 3 · 3.7 mi at 3.5% · 692 ft · starts 5.7 mi away
• Noriega StreetCat 3 · 2.3 mi at 4.6% · 574 ft · starts 6.7 mi away
• Quintara StreetCat 3 · 1.5 mi at 7% · 558 ft · starts 6.9 mi away