24hr January ultramarathons in United States

Tranquil Wekiwa Springs trails, challenging ultra course, scenic views, local wildlife, solo or relay options, festival atmosphere with on-site aid

Ten 5ks within 24 hours on paved trail loops at Henderson’s Cornerstone Park, featuring frequent starts, green space for camping, and self-supported hydration

Out-and-back on Lake Bastrop’s North-South Trailway: packed dirt singletrack, sand and rock through Lost Pines, bridges and gently rolling terrain.

USATF-certified paved loop in Myrtle Beach, built for steady rhythm, pacing, and long hours on a repetitive road circuit.

Randomized trail loops through Clinton Lake State Park’s varied terrain, originating from Coneflower Campground, with 24-hour and shorter duration options

Looped 4.1667-mile course through Usery Mountain Regional Park, shifting from rugged trails by day to an out-and-back road at night, with timed hourly starts

Looped dirt trail course in Killen's Pond State Park with light roots and rubble, 80-foot elevation gain, scenic views, and minimalist support

Team-based trail course at The Silos Barn featuring fitness and strength tasks each lap, with one participant on the trail per team at a time

24- and 48-hour record-eligible track ultras on a newly resurfaced Florida Atlantic University loop, with infield crew setup and four-hour direction changes

24-hour format on the rugged Molcajete 1.0 loop, repeated again and again for a climbing-heavy endurance test.

Rugged 5-mile trail loop at Hardin Farm, with about 1,000 feet of climbing per lap on repeatedly hilly terrain.

24-hour endurance challenge at GORUCK HQ in Jacksonville Beach with limited entry and a focus on supporting veteran programs