50K February ultramarathons in North America

Scenic trails from Hacienda Entrance through Sierra Azul, summit finishes on Bald Mountain and Mt. Umunhum, diverse terrain and challenging climbs

Scenic, flat 50k route through Chesapeake and Pocomoke forests on Maryland's Eastern Shore, 95% trails with single-track and wide paths

Winter 50k on repeated loops around Devil’s Bathtub through glacial eskers, with fading daylight, lengthening shadows, and a cozy lodge each lap

Steep summit climb from Upper Parking Lot, technical descents, and multiple laps on a rugged mountain loop amid challenging elevation changes.

Fast, scenic rail-trail ultra on a 15.5-mile out-and-back through Fort Richardson State Park, with paved trail and soft fine gravel footing.

50-mile loop around Skull Mesa via Trail 4, Chalk Canyon and Seven Springs, with Sonoran Desert singletrack, creekside stretches and rugged canyons

Steep initial ascent to Stone Mountain summit followed by a demanding 8-mile loop, repeated four times for the 50k distance

Arizona Trail ultra through the Madrean Sky Islands, with wide-open high desert views stretching toward Mexico.

Winter loops or out-and-back segments on horse, snowmobile, or Ice Age and Scuppernong trails, with flexible routing based on trail and weather conditions

Historic former Army landscape with coastal trails, preserved nature reserves, and sections of Fort Ord National Monument

Two-loop 50K in Anne Springs Close Greenway: technical singletrack, gravel and dirt trail, creek crossings, mud, and a rugged old-school feel.

Dirt and gravel roads, leaf-covered four-wheel drive paths, 4,500 feet of elevation gain, multiple water crossings, remote Cookson Hills landscape

Scenic 5K lakeside loop along Lower Lake with tranquil water views, peaceful natural backdrop, and a relaxed, low-key atmosphere

Single-track trails through 6,000 acres at Guntersville State Park, featuring bluff overlooks, mountain and lake scenery, and multiple spectator access points.

Single-track 50k route through Jefferson Memorial Forest, challenging elevation, seasonal trail conditions, and Louisville skyline views

Ten 5k loops through rolling woods and around a lake, wide trails, creek crossing, aid stations with hot soup, bonfire area, heated restrooms

Multiple 5K trail loops at First Landing State Park from sunrise to sunset, solo or team relay format

Fast and flat USATF-certified rails-to-trail course on Five Mile Creek Greenway, connecting Fultondale, Gardendale, and Brookside north of Birmingham

Pacific Coast scenery and Marin Headlands landscapes, with views of Tiburon, San Francisco, and the Golden Gate Bridge

Rugged 50K in Angeles National Forest with 9,000+ feet of climbing and descending on mostly dirt trails through steep canyon terrain.