Greenhorn Road Climb
- long (3.0 km)
- 1.9 mi
- long (3.0 km)
- of climbing (175 m)
- 574 ft
- of climbing (175 m)
- average grade
- 5.8%
- average grade
- steepest 500 m
- 7.9%
- steepest 500 m
Elevation profile
From 4,311 ft at the bottom to 4,885 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 Greenhorn Road this week
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Is it safe to bike up Greenhorn 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 Greenhorn Road
- How long and steep is the Greenhorn Road climb?
- 1.9 miles (3.0 km) at 5.8% on average, climbing 574 ft (175 m) from 4,311 ft to 4,885 ft. The steepest half kilometre averages 7.9%. That makes it a Category 3 climb.
- Where does the climb start and finish?
- It starts at 39.89887, -120.75895, where Greenhorn Road leaves Greenhorn Ranch Road, and ends where the road ends at 39.91337, -120.73074.
- Is Greenhorn Road paved?
- Mostly: OpenStreetMap tags 67% of the climb as paved, and the rest as dirt or gravel.
- 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
- Squirrel-Taylor RoadCat 1 · dirt · 8.4 mi at 5.8% · 2,579 ft · starts 2.5 mi away
- Argentine-Flournoy RoadHC · dirt · 6.5 mi at 7.7% · 2,664 ft · starts 2.7 mi away
- Sloat McRae RoadHC · dirt · 12 mi at 4.1% · 2,694 ft · starts 3.5 mi away
- Eureka Ridge RoadCat 1 · dirt · 8.0 mi at 6% · 2,552 ft · starts 4.2 mi away
- La Porte Road near PortolaHC · 8.2 mi at 6.1% · 2,644 ft · starts 5.6 mi away
- La Porte Road near PortolaCat 3 · 2.8 mi at 4.1% · 614 ft · starts 5.6 mi away
- La Porte Road from Pondside DriveCat 3 · 4.5 mi at 4.2% · 994 ft · starts 6.9 mi away
- Mount Hough RoadHC · dirt · 9.5 mi at 7.1% · 3,547 ft · starts 8.9 mi away
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.