Thomas Mountain Road Climb
- long (11.8 km)
- 7.3 mi
- long (11.8 km)
- of climbing (691 m)
- 2,267 ft
- of climbing (691 m)
- average grade
- 5.9%
- average grade
- steepest 500 m
- 10.7%
- steepest 500 m
Elevation profile
From 4,400 ft at the bottom to 6,667 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 Thomas Mountain Road this week
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Is it safe to bike up Thomas 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. 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 Thomas Mountain Road
- How long and steep is the Thomas Mountain Road climb?
- 7.3 miles (11.8 km) at 5.9% on average, climbing 2,267 ft (691 m) from 4,400 ft to 6,667 ft. The steepest half kilometre averages 10.7%. That makes it a Category 1 climb.
- Where does the climb start and finish?
- It starts at 33.65766, -116.66875, where Thomas Mountain Road leaves Thomas Mountain YP01, and tops out at Thomas Mountain Lookout at 33.62247, -116.6813.
- Is Thomas Mountain 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
- Pines To Palms Highway near Palm SpringsCat 3 · 1.9 mi at 5.8% · 584 ft · starts 1.1 mi away
- Apple Canyon RoadCat 2 · 3.6 mi at 5.8% · 1,086 ft · starts 1.3 mi away
- Morris Ranch RoadCat 3 · 3.6 mi at 5.1% · 971 ft · starts 3.7 mi away
- Banning-Idyllwild Panoramic Highway near Palm SpringsCat 2 · 7.3 mi at 4.5% · 1,745 ft · starts 4.7 mi away
- Hog Lake Truck TrailCat 3 · 1.4 mi at 8% · 607 ft · starts 5.4 mi away
- Pinecrest AvenueCat 3 · 1.5 mi at 8.3% · 659 ft · starts 6.7 mi away
- Fern Valley RoadCat 3 · 1.8 mi at 8.9% · 840 ft · starts 6.9 mi away
- Hill StreetCat 3 · 2.4 mi at 5.5% · 689 ft · starts 7.1 mi away
Found from OpenStreetMap roads and USGS 3DEP elevation; ranked on shape only. Category 1: 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.