Winter ultramarathons in Wisconsin, United States

Rugged winter ultramarathon with 136 feet elevation gain per mile, persistent climbs and descents at Twin Valley's chilly, scenic terrain

Out-and-back 50K on the Glacial Drumlin State Trail from Lake Mills to Cottage Grove, a steady rail-trail route with a peaceful overnight feel.

Rolling hills, mixed trail and gravel with mostly asphalt, northwestern Wisconsin scenery, potential winter conditions in December

Winter endurance event on the Tuscobia State Trail with 160-mile and 80-mile options for runners, bikers, and skiers in Northern Wisconsin

Two-loop ultramarathon from Emma Carlin, including Ice Age Trail to Whitewater and Scuppernong Trails, remote terrain, self-supported with aid stations

Winter loops or out-and-back segments on horse, snowmobile, or Ice Age and Scuppernong trails, with flexible routing based on trail and weather conditions

Winter timed ultra with solo or relay options, 12- or 20-hour formats, continuous distance challenge