Marshall-Petaluma Road Climb from Shoreline Highway
- long (4.6 km)
- 2.9 mi
- long (4.6 km)
- of climbing (222 m)
- 728 ft
- of climbing (222 m)
- average grade
- 4.8%
- average grade
- steepest 500 m
- 8.1%
- steepest 500 m
Elevation profile
From 26 ft at the bottom to 755 ft at the top. Grades are averaged over each half kilometre, from USGS elevation data, so short ramps can be steeper than they show.
Weather at the top of Marshall-Petaluma Road this week
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Is it safe to bike up Marshall-Petaluma Road?
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.
Common questions about Marshall-Petaluma Road
- How long and steep is the Marshall-Petaluma Road from Shoreline Highway climb?
- 2.9 miles (4.6 km) at 4.8% on average, climbing 728 ft (222 m) from 26 ft to 755 ft. The steepest half kilometre averages 8.1%. That makes it a Category 3 climb.
- Where does the climb start and finish?
- It starts at 38.16315, -122.89258, where Marshall-Petaluma Road leaves Shoreline Highway, and tops out on the road at 38.15099, -122.84885.
- 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.
Other climbs nearby
- Pierce Point RoadCat 3 · 2.6 mi at 4.4% · 604 ft · starts 2.6 mi away
- Mount Vision RoadCat 2 · 4.3 mi at 5.3% · 1,198 ft · starts 4.1 mi away
- Vision RoadCat 3 · 1.7 mi at 10% · 912 ft · starts 4.5 mi away
- Marshall-Petaluma Road near PetalumaCat 3 · 2.9 mi at 3.6% · 564 ft · starts 4.6 mi away
- Drakes View DriveCat 3 · 1.3 mi at 9.4% · 663 ft · starts 6.7 mi away
- Limantour Road from Limantour Spit RoadCat 3 · 1.7 mi at 7.5% · 663 ft · starts 8.2 mi away
- Limantour Road near FairfaxCat 3 · 3.4 mi at 4.4% · 787 ft · starts 9.2 mi away
- Burnside RoadCat 3 · 2.1 mi at 4.8% · 525 ft · starts 12 mi away
Places to ride to nearby
Found from OpenStreetMap roads and USGS 3DEP elevation; ranked on shape only. Category 3: 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. Crashes: bike crashes reported within 100 ft of the climb, 2021–2025, from the California Crash Reporting System (CCRS), counted only where the report has map coordinates. Weather: National Weather Service. Access from OpenStreetMap tags; obey posted signs. How the data works.