Runner dies during Cocodona 250

A runner competing in the Cocodona 250 died Tuesday after experiencing a medical emergency on the course, according to race organizers and the Yavapai County Sheriff's Office.

Officials said the participant was a woman in her 40s who collapsed at a trailhead in the Groom Creek community south of Prescott. Her name was not released. Cocodona 250 co-director Erika Snyder said the race had been notified of the death and declined to share more details at the request of the runner's relatives.

What happened on the course

The Cocodona 250 is one of the most demanding ultramarathons in Arizona, with runners covering roughly 250 miles across northern Arizona trails. This year's race began Monday before dawn and includes stretches through Black Canyon City, Sedona, and Flagstaff.

Race organizers posted that they were asking participants, crew, volunteers, and first responders to keep the runner's family in their thoughts. They also said the race would continue.

Race safety questions

Ultramarathons push athletes through extreme distance, elevation, heat, and sleep deprivation, and deaths in the sport are rare. Still, a fatal medical emergency on a course this long is likely to renew questions about race safety, emergency response, and the limits of endurance events in Arizona.

The Cocodona 250 has become a major name in the ultrarunning world, drawing elite and amateur runners to some of the state's most recognizable terrain. For Phoenix-area runners who train in South Mountain, McDowell Mountain Regional Park, and along desert roads near Cave Creek, the race is a reminder of how quickly a long effort can turn serious.

Arizona running scene reacts

The event is part of a growing endurance scene that reaches into the Valley through run groups, specialty shops, and trail communities tied to places like Road Runner Sports in Phoenix, Runner’s Den in Tempe, and Fleet Feet Scottsdale. Many local runners follow Cocodona 250 for the same reason they watch Boston or Western States: it is a test of survival as much as speed.

The race is expected to continue, but officials have not said whether any changes will be made after the death.

Sources

  • [AP: A runner competing in a 250-mile Arizona ultramarathon dies after having a medical emergency](https://apnews.com/article/e8a0160db016960c24673d17cfaedeab)
  • [CBS News: Woman dies while competing in 250-mile ultramarathon in Arizona](https://www.cbsnews.com/news/woman-dies-arizona-ultramarathon-cocodona-250)
  • [Washington Post: A runner competing in a 250-mile Arizona ultramarathon dies after having a medical emergency](https://www.washingtonpost.com/sports/2026/05/06/ultramarathon-death-arizona-cocodona-250-prescott/eb965ee6-49ab-11f1-a119-857cd2bf4fd4_story.html)
  • [ABC News wire story: Runner competing in 250-mile ultramarathon dies after having medical emergency](https://abcnews.com/US/wireStory/runner-competing-250-mile-arizona-ultramarathon-dies-after-132730370)
  • [The Guardian: Runner dies after medical emergency during 253-mile ultramarathon in Arizona](https://www.theguardian.com/sport/2026/may/06/cocodona-250-ultramarathon-runner-dies)
  • [ABC News wire story: A runner competing in a 250-mile Arizona ultramarathon dies after having a medical emergency](https://abcnews.com/amp/US/wireStory/runner-competing-250-mile-arizona-ultramarathon-dies-after-132730370)
  • [The Independent: Runner dies during 250-mile ultramarathon race in Arizona](https://www.the-independent.com/news/world/americas/arizona-ultramarathon-runner-death-b2971888.html)