June ultramarathons in United States (Southwest)

Scenic 6.6-mile Red Loop featuring a tough 9,000-foot ridge climb, 1,121 feet of elevation change, wildflowers, and lush forests in the Rockies

52 miles with over 15,000 feet of elevation gain across oak forests, meadows, and steep climbs in the Santa Cruz Mountains and Sierra Azul Preserve

Scenic loop in Colorado's Wet Mountains, from lush alpine forests to arid high-desert terrain, panoramic Spanish Peaks and Sangre de Cristo views

Three-loop solo or relay race amid Lee Canyon's mountain scenery, with varied loop distances in the Humboldt-Toiyabe National Forest

Classic Sierra National Forest trails near Fish Camp, with a rugged point-to-point feel, historic terrain, and aid stations spaced several miles apart.

Single tracks and fire roads through the Santa Monica Mountains, with ridges and canyons across 100k, 50-mile, 50k, and 30k distances

Smooth single and double-track routes through Mueller State Park, spring-fed meadows, Pike Peak granite formations, and sweeping Colorado mountain views

Rooty dirt single-track and rolling hills on Waterloo Trails, 6.2-mile parkland loops with approximately 500 feet of elevation gain per loop, cupless event.

Repeated-loop 50K on mostly shaded, technical singletrack along the Madrone Trail, with sweeping Canyon Lake views and shoreline twists.

Out-and-back ultramarathon on the Pacific Crest Trail, featuring rocky single track, multiple climbs, and elevations rising from 3,000 to 6,000 feet.

Scenic Wasatch Mountains trails, attractive terrain, and a low-key local atmosphere with an intimate field and community support.

Mountain trail loop with 1,244 feet gain per five miles, wildflower meadows, Marsh Peak views, and scenic overlooks above Dry Fork Canyon

Ancient sand dunes, sandy trails, mossy forest floors, and a scenic loop along Clearwater Creek and the Athabasca in Fort Assiniboine Sandhills Wildland

Crushed gravel 5-mile loops with subtle elevation, limited shade, intense daytime sun, and nighttime darkness; elimination after each hour loop

Point-to-point course from Cal Memorial Stadium to Skyline High School featuring 18,000ft of elevation, redwood forests, exposed ridges, and lakefront trails.

Flat, fast cross-country loop on dirt, grass, and gravel with minimal elevation gain, Rocky Mountain views, and a course winding past rescued animals

Alpine singletrack and forested trails through Big Bear, featuring Pacific Crest Trail sections and panoramic views of Big Bear Lake and San Gorgonio Wilderness

Three-lap, 50K dirt trail around Barr Lake with 460 ft elevation gain and front range views; flat, fast course at 5,106 ft elevation

Rugged 50-mile loop in the Wasatch Mountains with technical trails, over 10,000 ft elevation change, five major climbs, and scenic canyon and valley views.

Nighttime desert trail routes through Estrella Mountain Park, featuring flowy paths, challenging sections, and varied terrain under the stars.