Big Tree Cucamonga Road Climb
- long (16.2 km)
- 10 mi
- long (16.2 km)
- of climbing (1,178 m)
- 3,865 ft
- of climbing (1,178 m)
- average grade
- 7.3%
- average grade
- steepest 500 m
- 15.7%
- steepest 500 m
Elevation profile
From 2,241 ft at the bottom to 6,106 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 Big Tree Cucamonga Road this week
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Is it safe to bike up Big Tree Cucamonga 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. Most of this climb is a dirt road, and falls away from public roads rarely reach police reports. What the records show: no bike crashes were reported along the climb from 2021–2025.
Common questions about Big Tree Cucamonga Road
- How long and steep is the Big Tree Cucamonga Road climb?
- 10 miles (16.2 km) at 7.3% on average, climbing 3,865 ft (1,178 m) from 2,241 ft to 6,106 ft. The steepest half kilometre averages 15.7%. That makes it a Hors catégorie climb.
- Where does the climb start and finish?
- It starts at 34.20174, -117.44886, where Big Tree Cucamonga Road leaves Lytle Creek Road, and tops out at Buck Point at 34.21555, -117.54003.
- Is Big Tree Cucamonga Road paved?
- Mostly not: OpenStreetMap tags 100% of the climb as dirt or gravel. Dirt roads can be closed in fire season or after rain, so check with the land manager.
- 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
- Lytle Creek RoadCat 3 · 5.7 mi at 3% · 902 ft · starts 1.2 mi away
- Cleghorn Ridge RoadHC · dirt · 15 mi at 3.9% · 3,054 ft · starts 2.6 mi away
- Kimbark AvenueCat 3 · 1.2 mi at 9.7% · 623 ft · starts 2.8 mi away
- Canon StreetCat 3 · 1.1 mi at 14.4% · 797 ft · starts 3.6 mi away
- Stockton Flats RoadHC · dirt · 13 mi at 7.1% · 4,856 ft · starts 3.8 mi away
- Applewhite RoadCat 3 · 1.8 mi at 8.3% · 787 ft · starts 4.5 mi away
- Bailey Canyon Road from Palm AvenueHC · dirt · 8.9 mi at 8.2% · 3,852 ft · starts 5.0 mi away
- Upper Lytle Creek DivideCat 1 · dirt · 8.4 mi at 5.9% · 2,618 ft · starts 5.8 mi away
Bike crash hotspots nearby
Found from OpenStreetMap roads and USGS 3DEP elevation; ranked on shape only. Hors catégorie: 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.