# Race the Western States 100: Sierra Nevada Trail Running Guide
The Western States 100 course is, paradoxically, more accessible to non-race runners than almost any other major 100-mile course in the world. The trail is public — Pacific Crest Trail and Tahoe Rim Trail in the high country, Western States Trail through the canyons, American River Trail along the river bottom. The full route can be hiked, run in sections, or attempted in long-day training runs across the entire year. The course only becomes "closed" for the 36-hour window of the race itself.
Whether you are training for Western States, exploring the Sierra Nevada's most significant single-trail corridor, or planning a multi-day point-to-point fastpacking trip, here is how to approach the route.
The Course in Four Training Segments
The 100.2-mile race course divides naturally into four distinct sections, each with different terrain, water access, and training value.
Segment 1: Olympic Valley → Robinson Flat (Miles 0-30) **Trail: High Country | Elevation gain: 6,200ft | Elevation loss: 5,800ft**
The race's opening section: from Olympic Valley's village square (6,200ft) up the Escarpment to 8,710ft, into the Granite Chief Wilderness, across the snowpack-affected high traverses, and down through the Lyon Ridge and Cougar Rock sections to Robinson Flat aid station at 6,800ft.
This section is the most scenic of the entire course and the most logistically simple to train: Olympic Valley has substantial parking, Robinson Flat is accessible by Forest Road 96. Out-and-back training runs of various distances are possible from either end.
Training value: Altitude acclimatization, high-country terrain, technical descent practice on the Cougar Rock section. The most useful single 30-mile training run on the course.
Segment 2: Robinson Flat → Foresthill (Miles 30-62) **Trail: American River Canyons | Elevation gain: 5,400ft | Elevation loss: 9,200ft**
The race's central canyon sequence: Robinson Flat down to Last Chance (mile 43), the long climb up to Devil's Thumb (mile 47, 5,200ft elevation), back down to Eldorado Creek (mile 53), up to Michigan Bluff (mile 55, 3,520ft), down to the American River, then up to Foresthill (mile 62, 3,200ft).
This section is the course's defining test. The Devil's Thumb climb — 1,500ft of gain in 2.0 miles — and the subsequent canyon sequence accumulate the heat-stress and quad-eccentric damage that determines finish times.
Training value: Heat acclimatization (the canyons reach 90°F+ in summer), technical descent under fatigue, hike-vs-run pacing strategy on the steep climbs. The single most important training segment for race-specific preparation.
Logistics: This section requires significantly more planning than Segment 1. The Devil's Thumb climb begins at Last Chance, accessible by an unmaintained Forest Service road (4WD recommended). Michigan Bluff is accessible from Foresthill. Most training runs use Foresthill as a base camp and run sections out-and-back.
Segment 3: Foresthill → Rucky Chucky (Miles 62-78) **Trail: California Loop | Elevation gain: 1,400ft | Elevation loss: 4,800ft**
The California Loop along the American River: a long, runnable section of forest single-track at the canyon bottom, dropping gradually from Foresthill toward the Rucky Chucky river crossing at mile 78.
Training value: Steady-state pacing practice, low-altitude heat training. The course's most "runnable" sustained section.
Logistics: Trailhead access at Foresthill and at the Auburn Lake Trails staging area for Rucky Chucky.
Segment 4: Rucky Chucky → Auburn (Miles 78-100.2) **Trail: Western States Trail | Elevation gain: 3,200ft | Elevation loss: 3,170ft**
The race's final 22 miles. The Rucky Chucky river ford (in low water years, a calf-deep wade; in high water years, a managed-rope crossing), the climb to Green Gate, the long rolling trail through the Auburn Lake Trails area, the Pointed Rocks aid station, the No Hands Bridge crossing of the North Fork American River, and the final road climb to the Placer High School stadium in Auburn.
Training value: Mental preparation, "fresh legs" simulation. Most race-specific training treats this section as a 50-km run from Auburn with the river crossing as the turnaround.
Logistics: Auburn is a small town with extensive parking. Multiple training routes possible from various trailheads.
Permits and Access
The Western States Trail course passes through three jurisdictions:
Granite Chief Wilderness (Segment 1 high country): Permits required for overnight use; day-use permits are free at trailheads. No quotas. Access is unrestricted to non-race users at all times of year.
Tahoe National Forest (Segments 1-3): No permits required for trail running or day use. Standard wilderness ethics apply.
Auburn State Recreation Area (Segment 4): No permits required. Standard state park rules.
Race-day access: During the race itself (Saturday 5:00am through Sunday 11:00am), aid stations and crew access are restricted to registered participants and credentialed crew. Other trail users are asked to choose other trails during this window. Outside of race weekend, the full course is permanently accessible.
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By air: Reno-Tahoe International Airport (RNO) is the most direct access for Olympic Valley — 50 minutes' drive from the airport to the village. Sacramento International (SMF) is the more direct access for Auburn — 45 minutes' drive. Most race participants fly into one and out of the other.
By car: Olympic Valley is on Highway 89, 12 miles from Truckee on Interstate 80. Auburn is on Interstate 80, exit 121. Foresthill (the central training base) is 17 miles east of Auburn on Foresthill Road.
Staging logistics for full-course training: Most multi-day fastpacking attempts of the Western States course are point-to-point, starting Olympic Valley and finishing Auburn. The most common shuttle arrangement is a car drop at Auburn followed by a paid shuttle service (the Auburn-based service "Run with the West" handles this for ultrarunners; approximate cost $250 one-way). Alternative: paired teams trade keys at midpoint training meets.
Best Season for Training
June-September is the only season during which the full course is reliably runnable. The high country (Segment 1) typically clears of substantial snow by mid-June and receives first significant snowfall in mid-October.
October-April: The canyon sections (Segments 2-4) remain runnable year-round. Winter training on the canyons is, in fact, ideal for heat-acclimated athletes preparing for the spring buildup — cool temperatures and unrestricted access make for productive sustained-effort training.
The Snow Year Variable: In high-snow years (2017, 2019, 2023), the high country can remain snow-bound into early July. Race directors maintain a backup "low route" course for extreme snowpack years; in 2017, the race was actually run on a substantially altered course. Athletes training in high-snow years should monitor the Sierra Nevada snowpack reports and adjust the timing of Segment 1 training accordingly.
Heat Training
The single most important non-running training input for the Western States 100 is heat acclimatization. The canyons reach 90°F+ in race conditions; athletes who arrive without measurable heat adaptation will, statistically, drop or DNF in the canyon sections.
The protocol used by most successful WSER finishers: - 4 weeks before race day: Begin sauna sessions (3-4 per week, 25-40 minutes, post-workout). Hot-room temperature 175-195°F. - 3 weeks before race day: Add 1-2 weekly outdoor runs in hot conditions (use the warmest available local conditions; mid-day sun exposure). - 2 weeks before race day: Continue sauna and hot-run protocol at peak frequency. - 1 week before race day (taper week): Reduce sauna frequency to 2 sessions; maintain duration.
Athletes who follow this protocol arrive on the start line able to manage 90°F canyon heat without the rapid cardiovascular drift that ends most non-acclimatized racers' days.
Lodging Logistics
Olympic Valley (race start): Village hotels (PlumpJack Inn, Resort at Squaw Creek, Squaw Village Lodge) are convenient but expensive in race week. Truckee (15 minutes away) offers more options at lower prices.
Foresthill (central training base): Limited lodging in the village itself; most options are short-term rentals in surrounding areas. Auburn (30 minutes away) offers full-service lodging.
Auburn (race finish): Multiple chain hotels off Interstate 80; race-week reservations should be made 4-6 months in advance.
Camping: Tahoe National Forest dispersed camping is available throughout the corridor. The Forest Service campgrounds along Foresthill Road (Big Reservoir, Sugar Pine) offer paid campsites with running water. American River canyons offer some dispersed camping.
Local Tips
Eat: Auburn: The Pour Choice for coffee and pastries; Carpe Vino for serious dinner. Foresthill: Worton's Market is the local grocery; Foresthill Pizza for pre-training carbs. Olympic Valley: Village dining is overpriced; drive to Tahoe City (15 minutes) for better value.
Gear: The Endurance Company in Auburn is the regional ultrarunning specialty shop — staffed by Western States finishers, knowledgeable about course-specific gear. Alpenglow Sports in Tahoe City for technical clothing and footwear.
Water Strategy on the Course: Springs and creeks throughout the high country provide reliable filterable water. American River and tributaries provide ample water in Segments 2-4. Carry filtration; the days of drinking from the Sierra streams without treatment are over.
FAQ
Can I run the full Western States course in a single day outside of race day? Yes, although the logistical complexity (shuttle, weather windows, daylight) is significant. Several established "Western States Single Day" attempts each year are made by trained ultrarunners. Expect 22-30 hours for a strong runner; the lack of aid station support extends times relative to race-day conditions.
Is the trail well-marked outside of race day? Mostly yes. The Western States Trail itself is reasonably well-marked through most sections. The high country and the canyon descents are well-defined trail. Some intersections — particularly in the Granite Chief Wilderness — require map/compass or GPS navigation. The official race-day course marking is in place only during race week.
Can I cross the Rucky Chucky river outside of race day? In low water years (typical mid-summer through fall), the river is wadeable. In high water years (typically May-June following heavy snow), the crossing is dangerous and should not be attempted without a planned alternative.
Do I need to be a Western States qualifier to access the trail? No. The trail is open to all users. The race entry system (lottery + qualifiers) governs only the race-day event.
For the 2026 Western States 100 race-week preview and current coverage, see our Western States 100 2026: Race Week Begins in the Sierra Nevada.
