April ultramarathons in Illinois, United States

Multiple ultra distances on a 10-mile single-track loop with rolling hills, prairie, creek crossings, 1,600 feet elevation gain per loop, and frequent aid stops

Rugged forest trails along the Mississippi River, challenging terrain, multiple distance options, and scenic views inside Loud Thunder Forest Preserve

Winding single tracks, rolling hills, and blooming spring scenery through Veteran Acres and Sternes Woods in Crystal Lake

Lap-based ultra in Deer Grove Forest Preserve West, with a mostly wide, non-technical course and a single aid station every 5.5 miles.