Mason Avenue Climb
- long (4.0 km)
- 2.5 mi
- long (4.0 km)
- of climbing (205 m)
- 673 ft
- of climbing (205 m)
- average grade
- 5.1%
- average grade
- steepest 500 m
- 11.2%
- steepest 500 m
Elevation profile
From 925 ft at the bottom to 1,598 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 Mason Avenue this week
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Is it safe to bike up Mason 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 Los Angeles, where only 3% of reported bike crashes have a map location, so the numbers here are too low. What the records show: no bike crashes were reported along the climb from 2021–2025.
Common questions about Mason Avenue
- How long and steep is the Mason Avenue climb?
- 2.5 miles (4.0 km) at 5.1% on average, climbing 673 ft (205 m) from 925 ft to 1,598 ft. The steepest half kilometre averages 11.2%. That makes it a Category 3 climb.
- Where does the climb start and finish?
- It starts at 34.25326, -118.57983, where Mason Avenue leaves Mayall Street, and tops out at Calabria Way at 34.28798, -118.58382.
- Is Mason 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
- Browns Canyon RoadCat 2 · 6.0 mi at 4.2% · 1,312 ft · starts 0.6 mi away
- Tampa AvenueCat 3 · 3.2 mi at 3.6% · 610 ft · starts 1.5 mi away
- Wilbur AvenueCat 3 · 3.0 mi at 3.7% · 594 ft · starts 2.0 mi away
- Santa Susana Pass RoadCat 3 · 2.0 mi at 5.1% · 531 ft · starts 2.0 mi away
- Reseda Boulevard from Mayall StreetCat 3 · 2.6 mi at 4.8% · 653 ft · starts 2.5 mi away
- Zelzah AvenueCat 3 · 3.0 mi at 3.5% · 561 ft · starts 3.2 mi away
- Box Canyon RoadCat 3 · 2.0 mi at 7.2% · 771 ft · starts 3.8 mi away
- Woolsey Canyon RoadCat 3 · 2.4 mi at 7.9% · 1,007 ft · starts 3.8 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.