Western States 100-Miles Endurance Run
Trail Running covering 160.9 km with up to 5,400 m D+ in Squaw Valley (California, United States)
Western States 100-Miles Endurance Run is an endurance sporting event in Squaw Valley, California, US focused on Trail Running. First held in 1973, the event is an established fixture on the endurance calendar. It is part of UTMB Index Races. Key features include Nature & Off-Road, Mountain, Forest, Multi-Day.
The competition program features Western States 100-Mile Endurance Run (160.93 km, +5,400 m D+). The next edition is officially confirmed from June 26, 2027 to June 27, 2027. Official race regulations, course details, and registration information are provided on the organizer's website (wser.org).
Event characteristics
Races & distances (1)
| Competition | Discipline | Distance | Elevation gain | Altitude range | Course type | Course & profile |
|---|---|---|---|---|---|---|
| Western States 100-Mile Endurance Run | Trail Running | 160.93 km | +5,400 m | 1,150 m - 3,418 m | Loop course | Route & profile |
Course route & map
Elevation profile & course telemetry
Altitude from 1,150 m to 3,418 m above sea level (+5,400 m D+, -5,400 m D-)
Frequently asked questions (FAQ)
When and where does Western States 100-Miles Endurance Run take place?
Western States 100-Miles Endurance Run takes place in Squaw Valley, California, US (start area at coordinates 39.197° N, 120.2357° W). The next edition is officially confirmed from June 26, 2027 to June 27, 2027.
What races and distances are offered at Western States 100-Miles Endurance Run?
The competition program features Western States 100-Mile Endurance Run (160.93 km, +5,400 m D+). The competitions belong to Trail Running.
What is the course layout and elevation profile for Western States 100-Miles Endurance Run?
The main competition (Western States 100-Mile Endurance Run over 160.93 km) is designed as a loop course featuring +5,400 m of elevation gain and -5,400 m of elevation loss, ranging between 1,150 m and 3,418 m above sea level. An interactive course map with route visualization, elevation profile, and GPX export is available in the course section on this page.
Where can I find registration and official race rules for Western States 100-Miles Endurance Run?
Official race regulations, course details, and registration information are provided on the organizer's website (wser.org).