Iron Heart
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Event overview
The Iron Heart is a trail running event held in mid-February 2025 at Maramec Spring Park, Massey Hill Shelter, 21880 Maramec Spring Dr, St. James, MO 65559. The event is organized around Valentine’s Day and offers individual and relay options for some distances.
Distances offered include:
- 100 Mile
- 100K
- 50 Mile
- 50K
- 20 Mile
- 15 Mile
- 20K
- 15K
- 10 Mile
- 10K
- 5 Mile
- 5K
Course, services, and logistics
The course uses trails in Maramec Spring Park, including the Leatherbritches Trail (1.8 miles) and the BallHooter Trail (3.2 miles) with about 246 ft of elevation gain on the BallHooter loop. An aid station is located at the changeover point between the two trails and is stocked with electrolyte drink, water, and hot quesadillas. Split Second Timing provides on-site timing and results.
Pacing rules: pacers are allowed for the 100 Mile after mile 50 and for the 100K starting at mile 52; pacers must check in and pick up a pacer bib. No pacers, including cyclists, are allowed for other distances. Awards include overall male and female awards for all distances; finishers of the 100 Mile, 100K, 50 Mile, and 50K receive custom belt buckles, and 100 Mile finishers receive custom gym bags. Camping is allowed in the parking lot with no hookups. Campground fees are listed for non-electric, electric, and full hookup sites, and there is an additional per-person fee for adults over 16. Visit the organization's website for the most recent information.