I-35 Challenge

OCT
17-18
2026
Complete the ultimate regional running test by finishing races in both the Garmin Kansas City Marathon and the IMT Des Moines Marathon on back to back weekends. Choose between marathon or half marathon distances in both cities.
17-18 Oct 2026
84 kilometers 63 kilometers Marathon

Always double-check with the organizer's website! This page may contain affiliate links.

I-35 Challenge Overview

The I-35 Challenge is a collaborative event between the Garmin Kansas City Marathon and the IMT Des Moines Marathon. This event requires participants to complete designated races in both Kansas City, Missouri, and Des Moines, Iowa, on concurrent weekends. The challenge takes place across two days in October.

Participants can choose from several event combinations to fulfill the challenge requirements. These include:

  • Kansas City Marathon and Des Moines Marathon
  • Kansas City Marathon and Des Moines Half Marathon
  • Kansas City Half Marathon and Des Moines Marathon
  • Kansas City Half Marathon and Des Moines Half Marathon

Registration options allow runners to sign up for both city races through a single integrated package or to join the challenge separately if they have already registered for the individual races in Kansas City and Des Moines. The event provides a platform for athletes to test their endurance by competing in two different cities within a short timeframe.

The partnership focuses on the connection between these two regional running events. Runners will navigate courses in both Kansas City and Des Moines as part of their participation in the selected distances. Visit the organization's website for the most recent information.

84 km
Kc Marathon + des Moines Marathon
63 km
Kc Half Marathon + des Moines Marathon
63 km
Kc Marathon + des Moines Half Marathon
Marathon
Kc Half Marathon + des Moines Half Marathon