April ultramarathons in Michigan, United States

Gently downhill 33.5-mile course along the Kal-Haven Trail from Kalamazoo to South Haven, featuring Southwest Michigan scenery and well-stocked aid stations.

Challenging 50K on gravel roads and farmland, featuring rolling hills, flat stretches, rural views, and the steep Ivan the Terrible ascent

Single track loop through lower Michigan wilderness with rolling hills, views of 10 lakes, wide trails, and regular aid stations.

50 miles from Lake Huron to Saginaw Bay on mostly dirt and unimproved rural roads; flat, open small-town countryside course