The IRONMAN Montana Marathon: Two Loops Along the Missouri, in the Hottest Part of the Day

The Course: What's Confirmed and What's Not

The official marathon is 42.2 km over two loops along the banks of the Missouri River, finishing near Elks Riverside Park, next to the IRONMAN Village and transition. The official profile description is "rolling."

According to unofficial sources, the course would use the River's Edge Trail system: mostly flat, with some undulations. It's a plausible assumption but not confirmed: the final map will come with the athlete guide. Since this is an inaugural edition, there are no race reports or established data. Don't plan splits down to the meter on a course that could change.

The two-loop format has one concrete advantage: on the second loop you know exactly what's coming, where the aid stations are and where the rollers are. And you see the crowds near the finish twice.

The Heat Is the Most Solid Data We Have

A lot of information is missing on this race, but the climate in Great Falls in mid-August is well documented: historically temps exceed 27 °C in 10 out of 11 years, with peaks up to 37 °C. The official figure lists a typical high of 28 °C. And the marathon, for nearly all age-groupers, falls exactly in the hottest hours of the afternoon.

On top of that, the bike course is exposed with little shade: you arrive in T2 with heat load already accumulated. Your run plan needs to start from there, not from pace.

Three operational rules:

• Active cooling from the first km: ice in your trisuit and cap, sponges, water over your body at every aid station. Don't wait until you feel hot: by then it's too late.
• Hydrate from the start, even if you feel fine at km 1. The debt gets paid in the second half of the second loop.
• Conservative start in the first 10 km: afternoon heat punishes anyone who goes out at "cool-conditions" pace.

Pacing: How to Approach the Two Loops

Our rough projections (our estimates, not official data): 5:30 for a comfortable finisher, 4:30 for a mid-range goal, 3:45 for a fast goal, 3:15 for top age-group.

With a real-feel of 28-30 °C, your sustainable pace drops compared to your cool-conditions benchmarks. Recommended approach:

1. First loop: controlled pace, 10-15 seconds per km slower than target, with focus on cooling and regular fluid intake. 2. Second loop: if you're feeling good, close it as a negative split. If the heat bites, the goal becomes not walking between aid stations.

If it's one of those 35+ °C days (it has happened historically), throw out the clock and run by feel: the finish line is the goal, not the split.

How to Prepare

• Train in the heat in the weeks before: long runs during the hot hours or with extra clothing. Heat adaptation takes time, you can't improvise it.
• Simulate aid station management: practice in training drinking and cooling down while walking 15-20 seconds, then getting going again. That's the tactic you'll use on race day.
• Test your race kit in the heat: it needs to work soaked with water and ice for hours without chafing.
• Check the official map as soon as it's released: profile, number and location of aid stations are not yet published in the sources consulted.

The Decision You Need to Make

If you can't or won't train in the heat, this race will demand a more humble time goal from you. Deciding that beforehand, with a clear head, is worth more than any pacing chart: anyone who shows up in Great Falls with a cool-weather target risks paying for it between km 25 and 42.