Hermosa Avenue Climb
- long (8.8 km)
- 5.4 mi
- long (8.8 km)
- of climbing (309 m)
- 1,014 ft
- of climbing (309 m)
- average grade
- 3.5%
- average grade
- steepest 500 m
- 6.4%
- steepest 500 m
Elevation profile
From 1,073 ft at the bottom to 2,087 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 Hermosa Avenue this week
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Is it safe to bike up Hermosa Avenue?
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. The records here are also incomplete: most reports along it are filed under Rancho Cucamonga, where only 5% of reported bike crashes have a map location, so the numbers here are too low. What the records show: 1 bike crash was reported on or beside Hermosa Avenue along the climb from 2021–2025, 1 of them serious or fatal.
Common questions about Hermosa Avenue
- How long and steep is the Hermosa Avenue climb?
- 5.4 miles (8.8 km) at 3.5% on average, climbing 1,014 ft (309 m) from 1,073 ft to 2,087 ft. The steepest half kilometre averages 6.4%. That makes it a Category 3 climb.
- Where does the climb start and finish?
- It starts at 34.08675, -117.58464, where Hermosa Avenue leaves Sharon Circle, and tops out at Sun Valley Drive at 34.16417, -117.58437.
- Is Hermosa Avenue 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
- Haven Avenue from Acacia StreetCat 3 · 4.2 mi at 3.3% · 748 ft · starts 0.6 mi away
- Hellman AvenueCat 3 · 4.5 mi at 3.5% · 823 ft · starts 1.1 mi away
- Archibald AvenueCat 2 · 7.3 mi at 4.1% · 1,594 ft · starts 1.6 mi away
- Milliken AvenueCat 3 · 3.4 mi at 3.3% · 597 ft · starts 2.1 mi away
- Carnelian StreetCat 3 · 3.6 mi at 4.5% · 863 ft · starts 2.3 mi away
- Amethyst AvenueCat 3 · 2.8 mi at 5% · 738 ft · starts 2.5 mi away
- Beryl StreetCat 3 · 3.3 mi at 4.3% · 755 ft · starts 2.8 mi away
- Day Creek BoulevardCat 3 · 3.2 mi at 3.2% · 528 ft · starts 3.0 mi away
Bike crash hotspots nearby
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.