IRONMAN 70.3 Michigan

IRONMAN 70.3 Michigan takes place in Frankfort, Michigan, on September 20, 2026. Organized by IRONMAN, it is a half-distance triathlon: a 1.2-mile (1.9 km) swim, a 56-mile (90 km) bike, and a 13.1-mile (21.1 km) half marathon run, for a combined 70.3 miles. The event takes place in late September in northern Michigan, and the three legs follow one another with transitions in between.

A 70.3 suits athletes who have finished a sprint or Olympic-distance triathlon and want a longer, steadier challenge without stepping up to the full-distance race. The run comes after several hours of effort, so your training should include brick sessions where you run off the bike and a long run of at least 10 to 12 miles. Give yourself a 16- to 20-week build across all three disciplines, practice open-water swimming with a wetsuit, and rehearse your nutrition on long rides so the half marathon does not become a survival march.