Trinity Road Climb
- long (5.5 km)
- 3.4 mi
- long (5.5 km)
- of climbing (431 m)
- 1,414 ft
- of climbing (431 m)
- average grade
- 7.8%
- average grade
- steepest 500 m
- 13.2%
- steepest 500 m
Elevation profile
From 335 ft at the bottom to 1,749 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 Trinity Road this week
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Is it safe to bike up Trinity 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: 1 bike crash was reported on or beside Trinity Road along the climb from 2021–2025, 1 of them serious or fatal (1 fatal).
Common questions about Trinity Road
- How long and steep is the Trinity Road climb?
- 3.4 miles (5.5 km) at 7.8% on average, climbing 1,414 ft (431 m) from 335 ft to 1,749 ft. The steepest half kilometre averages 13.2%. That makes it a Category 2 climb.
- Where does the climb start and finish?
- It starts at 38.37945, -122.51312, where Trinity Road leaves Sonoma Highway, and tops out on the road at 38.39616, -122.48149.
- Is Trinity 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
- Nelligan RoadCat 3 · 2.6 mi at 7.3% · 994 ft · starts 0.9 mi away
- Sonoma Mountain Road near SonomaCat 3 · 2.6 mi at 5.4% · 755 ft · starts 1.9 mi away
- Orchard RoadCat 3 · 1.7 mi at 7.3% · 669 ft · starts 2.3 mi away
- Morningside Mountain Drive from Arnold DriveCat 3 · 1.8 mi at 6.6% · 636 ft · starts 2.8 mi away
- Cavedale RoadCat 2 · 5.1 mi at 7.1% · 1,936 ft · starts 3.1 mi away
- Sonoma Mtn RoadCat 3 · 1.0 mi at 12.7% · 669 ft · starts 3.4 mi away
- Moon Mountain RoadCat 2 · 2.6 mi at 7.8% · 1,063 ft · starts 3.5 mi away
- Morningside Mountain Drive from Sobre Vista RoadCat 3 · 1.0 mi at 11.3% · 623 ft · starts 3.8 mi away
Places to ride to nearby
Bike crash hotspots nearby
Found from OpenStreetMap roads and USGS 3DEP elevation; ranked on shape only. Category 2: 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.