Winter ultramarathons in United States (Pacific North West)

Steep 0.35-mile loop with 89 meters elevation gain per lap, repeated up to 100 times for Everest-equivalent climbing and cumulative elevation awards

3.33 km loop course on asphalt and gravel with two climbs per lap, 120 feet elevation gain, start and finish at the bottom of the soap box derby hill

Casual, no-fee winter run on icy terrain with a low-key, unsupported atmosphere

Scenic Cedar River Trail route with 16 miles of packed gravel, 15 miles of paved bike path, gentle hill at mile 21, start and finish at Landsburg Park

Rugged technical trails through dense forests and along dramatic coastal bluffs, with challenging grades and a crossing of the Deception Pass Bridge

Flat single-track trails alongside the Willamette River, looped course with tranquil river views and smooth, approachable terrain

Winter Solstice laps on a fatass-style course, self-paced on trail terrain with on-site nutrition support

Scenic 5K looped trail at Fort Steilacoom Park with 3, 6, and 8 hour timed run options and convenient access to personal aid stations

Winter backyard ultra in Idaho Falls: repeating grass, dirt, and pavement loop, variable snow, and a last-person-standing format.

Scenic Oregon coast 50K with coastal trails and post-race potluck at Yachats Commons

Loop course on uneven, muddy winter trails at Bridle Trails State Park, shifting from daylight to night

Four 7.75-mile loops around Pullman on a scenic winter course through the Inland Northwest

Mountain ascent on a cold, wet, and rugged course through scenic terrain; endurance-focused route reflecting Olytrailrunners tradition

Scenic double out-and-back on Kirkland Corridor Trail with frequent runner sightings and easy aid station access

Rugged winter trails with unpredictable weather, extreme terrain, sparse aid stations, and self-reliant course requirements for experienced runners

Rugged coastal trails, steep cliffs, dense forest, and Deception Pass Bridge crossings with technical footing and scenic vistas

Multi-distance looped course connecting Bainbridge Island’s top public and private trail networks, with February weather and minimal road segments

Scenic southern Oregon Coast course following Cape Arago Highway, rolling hills with 2000 feet of gain, ocean views, mostly paved with some gravel

Two-loop 50K course around Henry Hagg Lake with muddy trails, lake views, and early-season conditions in Scoggins Valley Park, Oregon.

50K loop around Hagg Lake near Gaston, with sweeping lake views, muddy singletrack, slick footing, and a classic winter trail atmosphere.