A participant in the 2026 Cocodona 250 has died following a medical emergency on day two of the Arizona ultramarathon, organisers confirmed in a statement late on Tuesday evening. The race, run from Black Canyon City to Flagstaff over 253 miles, began on Monday morning with around 400 starters in the headline 250-mile event and several hundred more spread across companion races at distances from 40 to 250 miles. The 2026 edition is scheduled to close on Saturday, 9 May.
Race director Jamil Coury issued a brief statement on behalf of the organising team at Aravaipa Running. "Out of respect for their family and loved ones, we are not sharing additional personal details at this time," Coury said, "but our team is supporting those directly involved and will share more only if and when appropriate." Organisers have not disclosed the runner's identity, the cause of the medical emergency, or where on the course the incident occurred. Local authorities have been informed and are coordinating with the race team.
The Cocodona 250 traverses some of the most demanding terrain in American ultrarunning, climbing more than 40,000 feet across central Arizona's high desert and ponderosa pine country. Daytime temperatures in the lower sections routinely exceed 30 degrees Celsius before runners gain altitude through Crown King and Mingus Mountain, where overnight conditions can drop close to freezing. The combination of heat, altitude, sleep deprivation and sustained effort places extraordinary physiological demands on competitors, who are typically on the course for between 60 and 100 hours.
The race committee has confirmed that the 2026 event will continue as scheduled, a decision made in consultation with safety officials and described by organisers as a way to honour the memory of the fallen athlete while supporting the runners still on course. Aid station crews and medical personnel have been briefed on the situation, and the live tracking and broadcast operations are continuing without interruption. As of Wednesday morning, leader Rachel Entrekin was approaching mile 220 and runner-up Kilian Korth had passed Fort Tuthill aid station.
Tuesday's incident is the most serious to occur in the race's six-year history. Cocodona has previously seen a steady rise in medical interventions as the field has grown, with Aravaipa expanding the medical footprint each year to include intermediate aid station triage, mobile sweep teams and an on-call medical director. The wider trail community responded with an outpouring of tributes through Tuesday night, with athletes, crews and event partners pausing to acknowledge the loss before returning to the work of supporting those still moving toward Flagstaff.