Backyard ultramarathons in United States (Gulf Coast)

4.167-mile loop through Oak Mountain State Park with 500 feet of elevation gain per lap, backyard format, limited aid, capped at 100 participants

Night trail loops under the brightest full moon, marked courses of 3.3 or 4.17 miles, 8-hour lap challenge and 12-hour Last Runner Standing format

Hilly jeep road loops on 1North Adventure Trails, hourly 3.5-mile circuits, night running emphasis, flexible pacing, festive atmosphere, pancake breakfast

Backyard ultra at Wade Mountain Preserve: road opening, singletrack loops, then overnight road-only laps in classic last-runner-standing format.

Texas backyard ultra series: 4.167-mile hourly loops across rugged Hill Country trails, heat-exposed terrain, and Lost Pines sandy loam.

Crushed gravel loops with minimal elevation in Stephen F. Austin State Park, backyard format with personal aid stations and wide open spaces near Houston.

Looped 4-mile course through a scenic park of shaded trails and open paths, surrounded by towering pines in Lumberton, Texas

Mostly shaded, flat double-track on a compact double-lollipop course with minimal elevation and frequent returns to the central hub.

Last-runner-standing format on a smooth 4.17-mile crushed-gravel loop, with little elevation change and a practical camp-style central hub.

Alternating 4.167-mile trail and dirt road loops through San Felasco Hammock Preserve, self-supported format, last runner standing wins

Classic backyard ultra format with repeated hourly loops, last-person-standing endurance, and a stripped-back competitive atmosphere.

Hourly looped course elimination format, continuing until only one runner remains

Last-man-standing format on a challenging 4.5-mile trail loop near the Texas-Oklahoma border, designed for higher difficulty and originality

Night-time ultramarathon on 3.3- or 4.17-mile loops under a full Texas moon, featuring 8-hour and 12-hour last-person-standing formats

Remote South Florida trails through wetlands, wet prairies, cypress domes and pine flatwoods in the protected DuPuis Management Area.

Repeated 2-mile loop with cutoff-based laps, poker-inspired chip earning, and a last-runner-standing format that tightens after 100 miles