Four weeks out from the 2026 Western States 100, the start lists for the 27 June race in Olympic Valley have settled into what the Western States Endurance Run board and several long-time observers have called the deepest elite fields in the race's 53-year history. The 370-runner main lottery field is fixed, the sponsor and Golden Ticket allocations have closed, and the headline for both genders is the same: the race the rest of the year was meant to build toward will now be contested by every name that mattered last summer plus the most decorated returnee in the event's modern era.
The men's narrative is anchored by Jim Walmsley. The four-time champion and course-record holder, who was a did-not-start in 2025, confirmed his return on 1 May via a sponsor entry — a decade after his first start at Olympic Valley in 2016. Walmsley arrives in California after a winter of training in Flagstaff and a deliberately quiet European spring, and the question for the four-time winner is not whether he can run with the front but whether the front-loaded canyons after Robinson Flat still suit a 36-year-old whose last six months have been built around mountain rather than fire-road work.
The complication for Walmsley is Kilian Jornet. The Spanish-Norwegian, 38, has entered for the first time since 2011 and arrives off a quiet but heavily structured spring focused on long efforts in southern Spain. Behind Walmsley and Jornet, Caleb Olson and Chris Myers — first and second in 2025 — have both opted out, leaving room for a second tier headed by the European top ten from last year's UTMB and a clutch of US Golden Ticket runners whose tactical hand depends almost entirely on how the front two race the first marathon to Robinson Flat.
The women's field is where the depth claim is easiest to make. All ten of last year's top finishers are back, headed by 2025 champion Abby Hall, Chinese runner-up Fuzhao Xiang and Canadian third-placer Marianne Hogan. The 2026 Golden Ticket class adds Olympic marathon bronze medallist Molly Seidel, who has formally moved her focus to trails after the 2024 Olympic cycle, and Anne Flower, the physician who broke Ann Trason's 31-year-old Leadville 100 course record last August and then went on to set the 50-mile world record in November. The combined effect is a women's race in which sub-16-hour finishes from outside the podium are now a realistic expectation rather than an outlier.
That depth is also a planning headache for crews and for the race's medical staff. WSER's race director group has reiterated that the new aid-station capacity at Foresthill, expanded after the 2024 logjam, will be the limiting factor on how many sub-17-hour runners can be physically managed through the final 30 miles. Race day on Saturday 27 June still starts at 05:00 from Palisades, with the typical 30-hour buckle deadline at the Placer High track on Sunday morning — but the more interesting cutoff this year is whoever leads the men into Foresthill before sunset. If it is Walmsley, the race becomes a course-record question; if it is anyone else, the slow-burn battle to Auburn becomes the most-watched ultramarathon of the calendar.