| Barkley Marathons | |
|---|---|
 The start of the 2009 Barkley Marathons | |
| Date | March–April |
| Location | Frozen Head State Park, Tennessee, U.S. 36°07′34″N 84°30′04″W / 36.126°N 84.501°W |
| Event type | Trail racing |
| Distance | 100 miles (160 km) (5 laps of 20 miles (32 km)) |
| Established | 1986 |
| Course records | Men: 52:03:08, Brett Maune (2012) Women: 59:58:21, Jasmin Paris (2024) |
| Participants | 40 |
The Barkley Marathons is an ultramarathon trail race held each year in Frozen Head State Park in Morgan County, Tennessee, United States.
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 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 race is known for its extreme difficulty and many peculiarities.