Logo

Iron Heart

Saint James, United States • 13 Feb 2026

Iron Heart is a Valentine-themed trail running event held in St. James, Missouri, on the Forest City MTB Trail at Maramec Spring Park (21880 Maramec Spring Dr). Runners choose from a wide range of distances, including 5K, 5M, 10K, 10M, 15K, 15M, 20K, 20M, 50K, 50M, and ultramarathon options of 100K or 100M with a 36-hour cutoff.

The course offers winding forest trails and a dedicated mountain-biking flow track, ideal for a midwinter outdoor experience. The event supports solo or relay formats, with awards issued after all relay participants finish. On-site camping and shelter facilities add to the communal, outdoorsy atmosphere of Love • Run • Repeat. Visit the organization's website for the most recent information.

United States Missouri Saint James

Race information

Registration
100 mi
100m
100 km
100k
50 mi
50m
50 km
50k
20 mi
20m
15 mi
15m
20 km
20k
10 mi
10m
15 km
15k
10 km
10k
5 mi
5 km
Visit the organization's website for the most recent information.
Trail runs nearby

Lion King Backyard Ultra

Rolla - 9 mi from Saint James

Lion King Backyard Ultra takes place in Rolla, Missouri at Lions Club Park. It uses 4.167-mile (6.706 km) laps that must be completed within one hour. The course combines a dirt daytime loop with a paved nighttime loop, winding around a lake through woods.It is open-ended: the last runner to finish..

Ozark Trail 100 Mile Endurance Run

Steelville - 14 mi from Saint James

Situated in Steelville, Missouri, the Ozark Trail 100 Mile Endurance Run is a point-to-point ultramarathon through the Mark Twain National Forest and Ozark Trail. The course covers 100 miles of continuous single-track with about 12,000 feet of elevation gain, offering stream crossings and wilderness..