Marshall-Petaluma Road Climb near Petaluma

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 Marshall-Petaluma Road near Petaluma climb?

2.9 miles (4.7 km) at 3.6% on average, climbing 564 ft (172 m) from 197 ft to 761 ft. The steepest half kilometre averages 10.1%. That makes it a Category 3 climb.

Where does the climb start and finish?

It starts at 38.16658, -122.80791, and tops out on the road at 38.1516, -122.8458.

Is Marshall-Petaluma 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.

• Marshall-Petaluma Road from Shoreline HighwayCat 3 · 2.9 mi at 4.8% · 728 ft · starts 4.6 mi away
• Vision RoadCat 3 · 1.7 mi at 10% · 912 ft · starts 5.2 mi away
• Drakes View DriveCat 3 · 1.3 mi at 9.4% · 663 ft · starts 6.4 mi away
• Mount Vision RoadCat 2 · 4.3 mi at 5.3% · 1,198 ft · starts 6.7 mi away
• Pierce Point RoadCat 3 · 2.6 mi at 4.4% · 604 ft · starts 7.2 mi away
• Limantour Road near FairfaxCat 3 · 3.4 mi at 4.4% · 787 ft · starts 8.2 mi away
• Limantour Road from Limantour Spit RoadCat 3 · 1.7 mi at 7.5% · 663 ft · starts 9.0 mi away
• Burnside RoadCat 3 · 2.1 mi at 4.8% · 525 ft · starts 12 mi away