April ultramarathons in Wisconsin, United States

Point-to-point 50K on the Northern Kettle Moraine Ice Age Trail, with glacial landscapes, classic trail terrain, and early-season spring conditions.

55-mile spring relay from Oshkosh to downtown Green Bay, with lakeside shoreline, Calumet County countryside, and a long Fox River Trail section

Certified loop course with officially measured 50K and 100K routes, built for fast benchmark performances and a competitive race-day atmosphere.

Scenic 50k course in Governor Dodge State Park with 4,000 feet of elevation gain, multiple aid stations, and Driftless Area landscapes

Ice Age Trail out-and-back with Circle Loop bookends, varied hills, roots and rocks, and a flagged route requiring careful navigation