Requirements and times to submit an entry application are a closely guarded secret with no details advertised publicly. The Barkley is limited to 40 runners and usually fills up quickly the day registration opens. They have all completed the 3 loop 'Fun Run' twice. Previous women to have completed the 3 loop 'Fun Run' are Suzi Thibeault (1991, 1994), Nancy Hamilton (1991, 1993), Sue Johnston (2000, 2001) and Beverley Anderson-Abbs (2012, 2013). Sue Johnston previously started the fourth loop in 2001. In 2023, Jasmin Paris became the fourth woman to complete the 3 loop 'Fun Run' twice and only the second to start the 4th loop. The 2020 event was cancelled due to the COVID-19 pandemic. The 55-mile version was referred to as “the short one” and the 100-miler, “the long one.” In 1995, Mark Williams, of the United Kingdom, became the first to finish the full 100-mile version of the Barkley Marathons with a time of 59:28:48. In 1988 'Frozen' Ed Furtaw, from North Carolina, became the first to finish the original short version of the course with 32:14. įor the early years, the Barkley was 50-55 miles or so, with about 25,000-27,000 feet of climbing. Cantrell named the race for his longtime neighbor and running companion, Barry Barkley. Cantrell said to himself, 'I could do at least 100 miles,' mocking Ray's low mileage. Ray covered only about 12 miles (19 km) after running 54.5 hours in the woods hiding from air searches during the day. The idea for the race was inspired upon hearing about the 1977 escape of James Earl Ray, the assassin of Martin Luther King Jr., from nearby Brushy Mountain State Penitentiary. The Barkley course was the brain child of Gary ' Lazarus Lake' Cantrell and Karl Henn (Raw Dog). The race is limited to a 60-hour period from the start of the first loop, and takes place in March or early April of each year.

The course, which varies from year to year, consists of five loops of the 20+ mile, off-trail course for a total of 100 miles (160 km).

The Barkley Marathons is an ultramarathon trail race held each year in Frozen Head State Park in Morgan County, Tennessee.

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