24hr ultramarathons in United States (Southwest)

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

Looped 1.3-mile course featuring trail, grass, and bike path segments in Montgomery Waller Community Park, near Imperial Beach and Chula Vista

Scenic, flat 1.05-mile loop with ultra-distance options and generous time limits, designed for fast times and all experience levels

Looped 0.85-mile paved bike path through scenic Auburn, with picturesque ponds, shaded stretches, and multiple distance options

10 km dirt singletrack loop on a private cattle ranch, moderate climbs and sweeping views, well-stocked aid stations, overnight camping and evening bonfires

Scenic 0.82-mile loop at 7,240 feet on the Palmer Divide, surrounded by mountain views; community-focused 24-hour ultrarunning event

One-mile hard-packed dirt loop with direction changes every four hours, frequent aid stations, and personal camp support throughout timed ultra options.

Paved, illuminated 2-mile loop with minimal elevation at Sparks Marina, featuring lakeside scenery, sandy beaches, and flexible distance or timed challenges

Flat 2-mile loops on Trinity River trails, mostly pavement with optional grass, centered on close-up crowd energy at Martin House Brewery.

4.167-mile loop along the Jordan River trail, repeated hourly for 12 or 24 hours, featuring fall Wasatch Valley scenery and community atmosphere

2-mile double track dirt loop with 128 feet of gain per lap, mountain desert scenery, starlit night running, camping on-site, real bathrooms and aid station

Challenging 4.6-mile loop on private trails near Baum Lake, surrounded by fall foliage, wildlife, and scenic views

Rugged mountain hills, fire roads, and single-track trails through the Anza-Borrego Desert with alpine loops among junipers, pines, and oaks

24-hour and 6-hour trail races on Erwin Park trails, inaugural event at the Pecan Grove Pavilion in McKinney, Texas

Looped ultrarunning challenge in San Angelo State Park with flexible 2 to 24-hour durations and scenic natural surroundings

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

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

Tortugas Mountain 24-hour trail loop, Fatass-format race supporting Southern New Mexico Trail Alliance

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