Acorn Lane Climb
- long (2.5 km)
- 1.6 mi
- long (2.5 km)
- of climbing (270 m)
- 886 ft
- of climbing (270 m)
- average grade
- 10.8%
- average grade
- steepest 500 m
- 14.1%
- steepest 500 m
Elevation profile
From 850 ft at the bottom to 1,736 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 Acorn Lane this week
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Is it safe to bike up Acorn Lane?
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 Acorn Lane
- How long and steep is the Acorn Lane climb?
- 1.6 miles (2.5 km) at 10.8% on average, climbing 886 ft (270 m) from 850 ft to 1,736 ft. The steepest half kilometre averages 14.1%. That makes it a Category 3 climb.
- Where does the climb start and finish?
- It starts at 40.92994, -123.82575, and tops out at Trinity Highway at 40.9203, -123.8354.
- Is Acorn Lane 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
- Old California State Route 299 from Chezum Road near Blue LakeCat 2 · 5.2 mi at 5.8% · 1,575 ft · starts 1.4 mi away
- Old California State Route 299 from Chezum Road near Blue LakeCat 3 · 1.6 mi at 7.1% · 587 ft · starts 1.5 mi away
- Trinity Highway near Blue LakeCat 2 · 6.4 mi at 5.4% · 1,827 ft · starts 2.0 mi away
- Trinity Highway near Blue LakeCat 2 · 4.4 mi at 5.5% · 1,296 ft · starts 2.1 mi away
- Saber Tooth Road near Blue LakeCat 3 · 1.5 mi at 11.5% · 892 ft · starts 2.2 mi away
- Old Three Creeks RoadCat 2 · 4.4 mi at 6.3% · 1,490 ft · starts 2.5 mi away
- Bair Road near Blue LakeCat 2 · 3.6 mi at 6.7% · 1,250 ft · starts 2.7 mi away
- Bair Road near Blue LakeCat 1 · dirt · 8.2 mi at 6% · 2,615 ft · starts 2.8 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.