Mosquito Road Climb near Placerville
- long (19.8 km)
- 12 mi
- long (19.8 km)
- of climbing (835 m)
- 2,740 ft
- of climbing (835 m)
- average grade
- 4.2%
- average grade
- steepest 500 m
- 13.6%
- steepest 500 m
Elevation profile
From 1,322 ft at the bottom to 4,062 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 Mosquito Road this week
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Is it safe to bike up Mosquito 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: 1 bike crash was reported on or beside Mosquito Road along the climb from 2021–2025, 1 of them serious or fatal.
Common questions about Mosquito Road
- How long and steep is the Mosquito Road near Placerville climb?
- 12 miles (19.8 km) at 4.2% on average, climbing 2,740 ft (835 m) from 1,322 ft to 4,062 ft. The steepest half kilometre averages 13.6%. That makes it a Hors catégorie climb.
- Where does the climb start and finish?
- It starts at 38.77579, -120.74801, and tops out on the road at 38.86277, -120.64421.
- Is Mosquito Road paved?
- Mostly not: OpenStreetMap tags 63% 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
- Mosquito Road near PlacervilleCat 3 · 2.0 mi at 9.5% · 981 ft · starts 0.0 mi away
- Kona DriveCat 3 · 1.7 mi at 7.8% · 692 ft · starts 1.6 mi away
- Rock Creek Road near PlacervilleCat 2 · 4.7 mi at 4.9% · 1,227 ft · starts 2.1 mi away
- El Dorado TrailCat 3 · 3.6 mi at 3% · 581 ft · starts 2.8 mi away
- Route 50 from Fall Trail RoadCat 3 · 4.3 mi at 3.3% · 768 ft · starts 2.9 mi away
- Route 50 from Parkway DriveCat 3 · 4.5 mi at 3.7% · 886 ft · starts 3.0 mi away
- Trail Gulch RoadCat 3 · 1.3 mi at 9.7% · 682 ft · starts 3.4 mi away
- Carson RoadCat 2 · 8.6 mi at 3.3% · 1,522 ft · starts 3.7 mi away
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.