Winter ultramarathons in Missouri, United States

Rugged Springfield trails, year-end atmosphere, festive gatherings, special recognition for back-to-back efforts

Challenging double-loop 50k from Krug Park to River Bluff, with steep bluff climbs above the Missouri River and rugged rolling dirt trail.

Compact loop course in Springfield, eight laps for the full marathon distance, late-season timing, supporting local charities

Rugged multi-loop course through rolling wooded hills, creek bottoms, and pine floors with up to 15,000 feet of elevation change near St. Louis

4.15-mile loop of moderately technical singletrack through hardwood forest, with rocks, roots and about 400 feet of elevation gain per lap

Rugged 4.2-mile dirt loop on single track with 397 feet elevation gain per lap, rocky and rooted terrain at Greensfelder Park, options of 9, 6, or 3 hours

Valentine's weekend ultramarathon featuring 100 Mile and Metric Century options, scenic trails, 36-hour cutoff, and Friday evening start for the Century

Scenic rails-to-trails course from Columbia along Flat Branch Creek, past the historic Burr Oak, with Missouri River views and bluffs

.66-mile loop with varied terrain and elevation, untimed winter event focused on movement and community, amenities along the course