The Kettle Moraine 100 Endurance Runs, set for June 13, 2026, in the stunning Kettle Moraine State Forest near La Grange, Wisconsin, offers an unforgettable challenge across 100M, 100K, 38M, and 50K distances. This storied event, one of the oldest 100-mile races in the country, traverses roughly 65 miles of the Ice Age National Scenic Trail, immersing runners in a landscape shaped by glaciers. The course is predominantly single-track, winding through 80% wooded terrain interspersed with scenic prairies and marsh areas. While the overall elevation may seem modest, the continuous "roller coaster of hills" delivers approximately 8,800 to 10,000 feet of total altitude gain for the 100-mile distance, earning these ascents the nickname "silent killers" among runners. Expect a diverse footing ranging from soft pine needle beds to sections with scattered rocks and roots.

Typical race day conditions in mid-June feature highs around 89°F and lows near 64°F, with a 15% chance of precipitation, meaning runners should be prepared for potential heat and humidity. The race is renowned not only for its challenging terrain and breathtaking scenery, which includes glacial landforms like kettles, moraines, kames, and drumlins, but also for its exceptional organization and supportive community. Aid stations, strategically placed throughout the course, are a highlight, boasting 21 staffed and 8 unstaffed locations for the 100-mile event. These are celebrated by runners for being incredibly well-stocked with a variety of food, drinks, and ample ice, staffed by enthusiastic volunteers dedicated to ensuring a positive experience.

Starting from the Nordic Trailhead (with the 50K kicking off from the Scuppernong aid station), the Kettle Moraine is a Western States 100 qualifier and holds a special place in ultrarunning history as the first major 100-mile race to be won overall by a woman in 1998. Runners consistently praise the well-marked trails and the supportive atmosphere that makes tackling its unique "rolling" challenges a deeply rewarding experience. Whether you're a seasoned ultrarunner or looking to conquer your first 100-miler, the Kettle Moraine offers a demanding yet beautiful journey through a truly special Midwestern wilderness.