12hr November ultramarathons in United States

High-desert winter loops near Zion, flexible ultra distances up to 150 miles, scenic ranch resort trails, communal support, and included camping amenities

Largely flat 4-mile loops on the New Boston Rail Trail by the Piscataquog River and Hillsborough fairgrounds

Timed ultra on crushed limestone loops around Miola Lake, featuring scenic views and regular aid stations

Paved 2-mile loop through Ravine Gardens State Park, with winding curves, a few hills, shaded oaks, and old Florida scenery.

Hourly 4.1666-mile loop in Winchendon, backyard ultra format, relaxed camping and communal atmosphere with aid stations and bonfires

5.5-mile dirt loop with few roots, paced for lap consistency, beside Belleplain State Park with wooded South Jersey surroundings.

Steep, rugged Utah loop with repeated 1-mile climbs and descents, heavy vertical gain, and a fully stocked aid station at the base.

Scenic, flat one-mile dirt loop with runner-friendly terrain and all-day support in a communal atmosphere

Steep 4.167-mile loop with 25–30% grades, creek crossings, tree obstacles, rocky summit sections, and scenic descents at Deam Lake SRA

USATF-certified track ultramarathon with 6, 12, 24, and 48-hour timed race options on a newly renovated surface at Florida Atlantic University

One-mile loop on crushed limestone and grass at Wolverine Sports Complex, alternating shaded and open sections, frequent access to aid and crew areas.

Challenging 5-mile loop on private Carthage trails, mixing pine straw paths and technical terrain with 800+ feet of elevation gain per lap

Paved out-and-back 4.167-mile loops along 8 Mile Creek Trail, no street crossings, 12 and 24-hour last participant standing format in Paragould, Arkansas

Looped former equestrian trails with notable elevation changes, available in 3, 6, or 12 hour formats

Flat 1-mile loop around Belfry High School, with downhill stretches; two hills added for those reversing direction after 50 miles

Pine-lined 5k loops with soft trails, wooden teepee, rolling hills, 270 feet elevation gain per loop, community atmosphere, beginner-friendly terrain

Loop-based trail ultra in Greenwood, with rolling terrain, hand-cut singletrack and firmer walking paths on a compact circuit.

USATF certified 0.99-mile flat sidewalk loop at Estrella Mountain Regional Park, with foothill views and multi-day ultradistance formats

Scenic 2.6-mile cross-country trail loop at Johns Island County Park, repeated over 24 or 34 hours, flexible time limits, all levels welcome

Scenic trails through 45,000 acres, ancient petroglyphs, rock formations, and possible night sky views; multiple ultra distances including 100M, 100k, 50m, and