St James, MO, United States · Saturday, February 13, 2027

Fixed Distance 100 mi

Iron Heart Ultra

163 days away

161 km Distance

not publishedn/a Climbing

8.1 est Grit · Hardcore

Calculated from 161 km alone — the organiser has not published an elevation profile. Read 8.1 as a floor, not a verdict.

37.9971° N, 91.6140° W © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Field size ~7 Tiny. You will run alone for most of it.

DUV results for the 2026 edition (50km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, February

Daytime high 6°C

Night low -5°C

Rainfall Mostly dry

Daylight 10 h 42 m of light

Regional 2001-2020 average for February — NASA POWER, grid elevation 288 m. Not a forecast.

The Aid Station

Course-specific beta from the community

👟 gear

With trail terrain, choose a shoe with moderate cushioning for optimal performance.

By UltraHub Expert

🥤 nutrition

For 100km+ efforts, prioritize real food at aid stations to prevent palate fatigue.

By UltraHub Expert

Gear for this race

Chosen for 161 km of trail.

Trail Running Shoes 161 km of trail — cushioning that is still there in the last quarter.
Race Nutrition Past 161 km the palate quits before the legs do — carry more than one flavour.
Hydration Vests Flask capacity for 161 km, without the bounce.
Headlamps 161 km almost certainly means running into the night.
Accessories Chafe and blisters end more 161 km races than fitness does.