The Kettle Moraine 100 is an ultramarathon held annually in early June in Kettle Moraine State Forest near La Grange, WI. The event includes a 100-mile race, a 100km race, and a 38-mile night "fun run."
The 100-mile race consists of two out and back legs, with the first-round trip distance being 62.9 miles and the second being 37.3 miles. The 100km race follows the first 62.9 miles of the 100-mile race and the 38-mile night "fun run" follows the last 37.3 miles. Runners registered for the 100-mile race may drop at the 100km finish.
The 100-mile course is run entirely on trails (except for a couple hundred feet of road crossings) and traverses the Ice Age Trail for about 65 miles. The trail is about 80% wooded terrain with the rest meandering through gentle prairie or marsh areas. Despite the low elevation, a roller coaster of hills amounts to a total altitude gain of approximately 8,800 feet. There is a 30-hour time cutoff to complete the race, with cutoffs at 3 aid stations along the course. There are 21 staffed aid stations along the course and 8 unstaffed aid stations with water and limited runner aid.
| Distance | Female | Time | Year | Male | Time | Year | ||
|---|---|---|---|---|---|---|---|---|
| 100 miles | Donna Perkins | 18:12:30 | 1998 | Zach Gingerich | 15:17:32 | 2009 | ||
| 100km | Kami Semick | 9:45:13 | 2005 | Michael Borst | 8:34:57.9 | 2015 | ||
| 50km | Emily Ansick | 4:43:10.2 | 2015 | Juan Moran | 3:58:36 | 2016 | ||
| 100mile relay | Gyro Trash | 16:48:55 | 2016 | Stella & the boys | 13:39:57 | 2023 |