One of running’s toughest events just ended — without anyone earning the right to stand on a podium. The 2025 Barkley Marathons concluded this week with no finishers of its 100+ mile course. There was just one completion of the Fun Run by U.S. athlete John Kelly.
Going back a year, the 2024 Barkley Marathons saw a record number of finishers — five in total, including Jasmin Paris, the event’s first-ever female finisher. This unprecedented result left many speculating that the 2025 Barkley Marathons course would be the hardest yet — and that expectation appears to have been met.
The Barkley Marathons is an unmarked ultramarathon at Frozen Head State Park, Tenn., consisting of five 20-plus-mile loops. Past competitors report covering up to 26 miles on a single loop. Navigation by GPS is not allowed, and runners must use a map and compass to navigate to locations on the route and collect pages from hidden books in lieu of a more traditional dibber system.
The route and book locations vary from year to year. Over time, race organizers purportedly make the race more difficult to finish.
“They made the course significantly harder this year and I missed the cutoff by two minutes for finishing Loop One,” runner Kelly Halpin told iRunFar. “But it was really fun. Hands down, the hardest course I think in history.”
The original version of this article appeared on iRunFar.

60 Hours to Finish 100+ Miles
In order to be awarded an official finish, runners must complete the five loops in less than 60 hours. Runners who don’t make the interim cutoffs still have the opportunity to complete a Fun Run, if they can finish three loops inside of 40 hours. This year, that seemed about as much as anyone could aspire to.
The event has no set start time, only a 12-hour start window. During that window, organizers blow a conch shell to signal the event will start in an hour.
For 2025, the race began on Tuesday, March 18, at 11:37 a.m. EDT, under relatively cool weather and partly cloudy skies, as race director Gary Cantrell, a.k.a. Lazarus Lake, lit his ceremonial cigarette. This was the latest start time on record for the event.
The Barkley Marathons entrants list is kept secret, and the names of participants aren’t generally mentioned in the organization’s coverage until the event’s advanced stages. This makes understanding the race dynamics, let alone the basic race roster, largely speculative. In this article, we share what we’ve been able to gather took place.