The Miwok 100K Trail Race is a 62 mile long (100 km) ultramarathon that takes place annually in southern Marin County, California, typically on the first Saturday of May.
The race starts and ends at Rodeo Beach. Most of the modified out-and-back course is on fire roads and single-track trails, with about two miles on roads. Runners climb (and descend) a cumulative total of 10,000 feet (3,050 m).[1]
The race begins at 5:40 A.M. The overall time limit for the race is 16 hours, 30 minutes.[2]
The race has been held every year since 1996, when it was known as the "What? Mi-Wok? Trail 100K", its name through 1999. Just over 300 runners have started the race each year since 2008. The course record of 7 hours, 53 minutes, 19 seconds was set by Dave Mackey in 2008. The women's course record of 8 hours, 55 minutes, 49 seconds was set by Ann Trason in 2001.[3]