April ultramarathons in Maryland, United States

Trail loop course at Genessee Valley Outdoor Learning Center with day and night running, mass start, time-based endurance format, and on-course support

Scenic Bunker Hill course on singletrack trails, fire roads, and asphalt; two-loop 50K route through Northern Baltimore County with stocked aid stations

5.25-mile looped 50K through woods, meadows and open parkland, with lake views on roughly half the route and a reflective tribute atmosphere

Fast 100-mile towpath course beside the Potomac River, with low elevation change, smooth footing and views toward the Appalachians.