I-35 Challenge

OCT
17-18
2026
A two-city running challenge linking the Garmin Kansas City Marathon and the IMT Des Moines Marathon. Runners complete paired marathon or half-marathon events across Kansas and Iowa and receive combined participant items plus a separate challenge medal.
17-18 Oct 2026
84 kilometers 63 kilometers Marathon

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I-35 Challenge

The I-35 Challenge is a paired-event offering created through a partnership between the Garmin Kansas City Marathon and the IMT Des Moines Marathon. The challenge spans two cities in two states over a single weekend and is completed by running paired races in Kansas City and Des Moines.

Participants may combine events in the following ways:

  • Full Marathon in Kansas City & Full Marathon in Des Moines
  • Full Marathon in Kansas City & Half Marathon in Des Moines
  • Half Marathon in Kansas City & Full Marathon in Des Moines
  • Half Marathon in Kansas City & Half Marathon in Des Moines

Entries include the usual participant items provided by each individual marathon. In addition, all I-35 Challenge participants receive a separate challenge-branded commemorative item and an additional finisher medal specific to the I-35 Challenge.

Registration can be completed for both events together through the joint challenge option. Those who have already registered for both races separately can select an I-35 only registration option to receive the challenge items and medal. Visit the organization's website for the most recent information.

84 km
Full Marathon in Kansas City & Full Marathon in des Moines
63 km
Full Marathon in Kansas City & Half Marathon in des Moines
63 km
Half Marathon in Kansas City & Full Marathon in des Moines
Marathon
Half Marathon in Kansas City & Half Marathon in des Moines
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