100mi June ultramarathons in United States (West)

Demanding 50- and 100-mile mountain routes over Scout Mountain, with tough climbs, rugged scenery, and high-country terrain in southeast Idaho.

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

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

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

Eight 12.5-mile loops on mostly single track and dirt roads, frequent rolling hills, 12,000 feet total elevation gain, multiple aid stations

13,600 feet of elevation change over single track and fire roads, alternating hilly 13.5 and 11.5-mile loops from Cool Firehouse through river and ridge terrain

High-desert single-track loops with 1,440 feet of elevation gain per lap, brief quad two-track, and expansive valley and mountain range views

Rugged out-and-back course in the Bighorn Mountains, reaching 10,000 feet with wildflower fields, stunning vistas, and tough mountain trails

Looped 100-mile route through Lassen National Forest and Thousand Lakes Wilderness, 15,000 feet of elevation change, rocky ridgelines, lush forests, panoramic  

10k dirt and gravel loop in Columbia River Gorge, 200 feet elevation change, fields, forests, river views, frequent amenities, up to 100-mile distance

Challenging loop from Belmont Mine, 63 miles on the Continental Divide Trail, nearly 14,000 feet of elevation change, summit reaching 8,400 feet

Central Cascades route on a converted Rails to Trails path, gentle crushed limestone surface, scree fields, valleys, 2.3-mile tunnel, grade under 5%

Trans-Sierra route from Olympic Valley, steep climb to Emigrant Pass, 100 rugged miles with 15,540 feet of ascent and 22,970-foot descent on historic trails

24-hour ultrarun through Cascade Mountain trails, with cliffs, waterfalls, meadows, and elk near Camp Sheppard

1.2-mile loop under Alaska’s midnight sun, with a shared aid station, basecamp atmosphere, and 50- and 100-mile options.