50K road ultramarathons in North America

33.5-mile loop through seven western suburbs, largely on bike paths, with a steady runnable surface and point-to-point feel

Rugged, heat-defined 24-hour and 48-hour ultra with smart pacing, cooler nighttime hours, and a laid-back, communal atmosphere

9-mile road loop from Kalama Valley Park, gentle elevation, Heartbreak Hill descent, support stations every 2.5 miles, cupless, sustainability focus

Track-based ultra at Newport High School featuring 24-hour, 12-hour, and 50K distances, with 125 laps marking the 50K finish

Elevation-packed trails across established and new routes in Old Fort’s scenic landscape, starting and finishing at Camp Grier

2.6-mile loop race with 40-minute intervals, 50K distance over 12 continuous laps, variable conditions and strategic pacing under time cut-offs

Flat, fast course on the NETT Trail with asphalt, gravel, soft ground, scenic bridge crossings, and starts and finishes at Paris, Texas' Eiffel Tower

Urban team run between Jacksonville Wawa stores, item collection and community support with relaxed, non-competitive routes

Scenic road loop circling a Finger Lake, mostly flat to rolling terrain with challenging climbs including the renowned Bopple Hill

Looped course around Lake Merced with a challenging route designed for long-distance running

Point-to-point and out-and-back ultramarathon across Michigan’s lower peninsula, with varied single-track, gravel, limestone, and seasonal road terrain

Flat, fast 50K on central Indiana’s B&O Trail, linking Speedway, downtown Indianapolis and quieter rural stretches.

Scenic route through Nova Scotia farmland and along the Minas Basin, gentle hills and rolling terrain, finish at Acadia University Stadium

Point-to-point 50K on Galveston Island’s open beachfront, with Gulf shoreline, ocean breeze, sunrise views, and an exposed runnable course.

Smooth, paved one-mile loop in Veteran's Park with multiple timed event options and electronic chip timing for solo runners or relay teams

Mixed surfaces through picturesque Norwell, Plymouth landscapes, with sections of paved paths, rail trails, and both single and double track terrain