How long is Highway 108, Sonora Pass?

About 124 miles as mapped in OpenStreetMap, for the stretch we cover.

Sierra Nevada & foothills

Highway 108, Sonora Pass

High Sierra crossing over 9,624 ft Sonora Pass.

mapped: 124 mi; mapped
motorcycle crashes, 2021–2025: 37; motorcycle crashes, 2021–2025
serious or fatal: 14; serious or fatal
fatal: 5; fatal

Open it on the map Directions Caltrans closures

Is Highway 108, Sonora Pass open today?

Full closure
Tuolumne/Mono County Line → Winter Closure Gate · Inclement Weather · East / West
since Nov 12, no end date listed · Caltrans

Chain control R-1 · 3.8 Mi. W of Jct. 395 / USMC Entry Gate, East
Chains are required on all vehicles except passenger vehicles and light-duty trucks under 6,000 pounds gross weight and equipped with snow tires on at least two drive wheels. Chains must be carried by vehicles using snow tires. All vehicles towing trailers must have chains on one drive axle. Trailers with brakes must have chains on at least one axle.
Chain control R-1 · Jct. 395, West
Chains are required on all vehicles except passenger vehicles and light-duty trucks under 6,000 pounds gross weight and equipped with snow tires on at least two drive wheels. Chains must be carried by vehicles using snow tires. All vehicles towing trailers must have chains on one drive axle. Trailers with brakes must have chains on at least one axle.
Chain control R-2 · CASCADE CREEK, East
Chains or traction devices are required on all vehicles except four wheel / all wheel drive vehicles with snow-tread tires on all four wheels. Four wheel / all wheel drive vehicles must carry traction devices in chain control areas.
Chain control R-2 · EAGLE MEADOWS RD, East
Chains or traction devices are required on all vehicles except four wheel / all wheel drive vehicles with snow-tread tires on all four wheels. Four wheel / all wheel drive vehicles must carry traction devices in chain control areas.
Chain control R-2 · EAGLE MEADOWS RD, West
Chains or traction devices are required on all vehicles except four wheel / all wheel drive vehicles with snow-tread tires on all four wheels. Four wheel / all wheel drive vehicles must carry traction devices in chain control areas.
Chain control R-2 · CLARKS FORK RD, East
Chains or traction devices are required on all vehicles except four wheel / all wheel drive vehicles with snow-tread tires on all four wheels. Four wheel / all wheel drive vehicles must carry traction devices in chain control areas.
Chain control R-2 · CLARKS FORK RD, West
Chains or traction devices are required on all vehicles except four wheel / all wheel drive vehicles with snow-tread tires on all four wheels. Four wheel / all wheel drive vehicles must carry traction devices in chain control areas.
Chain control R-2 · KENNEDY MEADOWS, West
Chains or traction devices are required on all vehicles except four wheel / all wheel drive vehicles with snow-tread tires on all four wheels. Four wheel / all wheel drive vehicles must carry traction devices in chain control areas.

Checked Sat, Nov 14, 5:32 AM Pacific. These lists don't include every closure: Forest Service gates and fire closures can be missing. All riding roads this week.

Is Highway 108, Sonora Pass safe to ride on a motorcycle?

We don't rate roads as safe or unsafe: crash counts can't say how risky a road is, and popular riding roads have more crashes partly because more people ride them. What the records show: 37 motorcycle crashes were reported along its 124 mapped miles from 2021–2025, 14 of them serious or fatal (5 fatal). 65% involved no other vehicle. What to watch for: Grades up to 26% and tight hairpins near the top, sudden weather changes at altitude, and closed in winter.

This week's weather

Weather

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Motorcycle crashes and deaths on Highway 108, Sonora Pass

37 motorcycle crashes were reported within 60 m of the road from 2021–2025: 14 killed or seriously injured someone, and 5 were fatal. 65% involved no other vehicle. Busier roads have more crashes partly because more people ride them, so these counts don't say how risky the road is.

Bends, straights and junctions

Outside city limits, 44 motorcycle crashes were reported on Highway 108, Sonora Pass from 2021–2026, 9 of them within 40 m of a junction. Of the other 35, 17 (49%) were in bends tighter than a 100 m radius, which make up 20% of the road. So crashes gather in the bends, more than their share of the road. 15 of the 32 crashes with no other vehicle were in bends.

The bends with the most crashes

5 crashes in one bend: 5 with no other vehicle, 0 of 5 on the grade going downhill; tightest radius about 67 m.

How we tell bends from straights, and every riding road compared

Places along the way

Sonora PassView or pass

Camping near Highway 108, Sonora Pass

Campgrounds and RV parks within about 5 miles of the road (straight line), nearest first. Seasons, fire restrictions and closures change, so check with whoever runs it before you go.

Mill Creek CampgroundForest Service · 6,243 ft · on the roadOn the map Recreation.gov
Boulder Flat Campground5,640 ft · on the roadOn the map
Pigeon Flat CampgroundForest Service · 7 sites · 5,966 ft · on the road · feeOn the map Recreation.gov
Eureka Valley CampgroundForest Service · 6,084 ft · on the roadOn the map Recreation.gov
Dardanelle CampgroundForest Service · 5,767 ft · on the roadOn the map Recreation.gov
Chipmunk Flat Campground7,965 ft · on the roadOn the map

Campgrounds from Recreation.gov (federal campgrounds, 2026-10-18) and OpenStreetMap (2026-09-28); water, toilets and showers only where they're listed. Elevation from USGS.

Common questions about Highway 108, Sonora Pass

What is Highway 108, Sonora Pass like to ride?: High Sierra crossing over 9,624 ft Sonora Pass.
How long is Highway 108, Sonora Pass?: About 124 miles as mapped in OpenStreetMap, for the stretch we cover.
Is Highway 108, Sonora Pass open today?: As of Sat, Nov 14, 5:32 AM Pacific, Caltrans lists 1 closure on it today (one of them a full closure). Chain controls are in effect (R-1, R-1, R-2, R-2, R-2, R-2, R-2, R-2). These lists don't include every closure (Forest Service gates and fire closures can be missing), so check Caltrans QuickMap before you go.

Other riding roads nearby

Highway 4, Ebbetts Pass19 mi Highway 49, Gold Country43 mi Highway 168 to Huntington Lake82 mi Mines Road102 mi Mount Hamilton Road113 mi Highway 245 (Woodlake to Kings Canyon)123 mi

All riding roads

Crashes: motorcycle crashes reported within 60 m of the road, 2021–2025, from the California Crash Reporting System (CCRS). Road: © OpenStreetMap contributors. Weather: National Weather Service. Distances to other roads are between their middles, in a straight line. How the data works.