Relay ultramarathons in Wisconsin, United States

Historic Blackhawk Ski Club loop with 367 feet of gain per 2.25-mile lap, 50-foot pines, spring pool, rope swing, and climb beneath the ski jump

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

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

Primarily wooded trail with roller coaster hills, prairie and marsh stretches, soft pine needle footing, and recurring "Silent Killer" climbs