Heatwave Half Marathon - St. Louis 2026

The race.

The Heatwave Half Marathon takes place August 1, 2026, in St. Louis, MO. The half marathon distance is offered alongside a 10K, 5K, and 1-mile option. All half marathon, 10K, and 5K registrants receive a custom bib, designer shirt, and finisher medal, with chip timing and live results. Ice cream is provided at the finish. Youth ages 12 and under register for $17. Registration closes at midnight on Thursday, two weeks before race day, to guarantee a shirt size. A virtual race option is available for participants unable to run in person.