Chalk Mountain Road Climb from Alderpoint Road
- long (1.7 km)
- 1.1 mi
- long (1.7 km)
- of climbing (202 m)
- 663 ft
- of climbing (202 m)
- average grade
- 11.8%
- average grade
- steepest 500 m
- 14.2%
- steepest 500 m
Elevation profile
From 1,319 ft at the bottom to 1,982 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 Chalk Mountain Road this week
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Is it safe to bike up Chalk Mountain 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 Chalk Mountain Road
- How long and steep is the Chalk Mountain Road from Alderpoint Road climb?
- 1.1 miles (1.7 km) at 11.8% on average, climbing 663 ft (202 m) from 1,319 ft to 1,982 ft. The steepest half kilometre averages 14.2%. That makes it a Category 3 climb.
- Where does the climb start and finish?
- It starts at 40.43805, -123.78351, where Chalk Mountain Road leaves Alderpoint Road, and tops out at Chalk Mt Ranch Road at 40.4307, -123.79105.
- Is Chalk Mountain 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
- Sturm Road from Alderpoint RoadCat 3 · 1.8 mi at 6.9% · 646 ft · starts 0.6 mi away
- Alderpoint Road from Sturm RoadCat 3 · 2.1 mi at 5.8% · 636 ft · starts 0.7 mi away
- Sturm Road near Rio DellCat 3 · 1.1 mi at 10.6% · 627 ft · starts 1.1 mi away
- Chalk Mountain Road near Rio DellCat 3 · 4.2 mi at 4.5% · 984 ft · starts 1.4 mi away
- Alderpoint Road near Rio DellCat 3 · 2.7 mi at 4.8% · 669 ft · starts 2.3 mi away
- Kneeland Road near Rio DellCat 1 · dirt · 8.9 mi at 4.8% · 2,260 ft · starts 2.4 mi away
- Chalk Mountain Road near Rio DellCat 2 · 1.9 mi at 11.3% · 1,152 ft · starts 3.4 mi away
- Mc Clellan Mountain RoadCat 3 · 1.7 mi at 6.8% · 597 ft · starts 4.5 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.