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MarathonHalf MarathonRegistration open

I-35 Challenge

Kansas City, Missouri
Entry from
$35
Days to go
11
Register from $35 on RunSignUpi35challenge.com

At a glance

Date
Oct 17–18, 2026
Location
Kansas City, Missouri
Distances
Marathon, Half Marathon
Registration
Registration open until Oct 15, 2026, via runsignup.com
Official site
i35challenge.com
Listed from
RunSignUp
Last checked
Oct 5, 2026

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About this race

The I-35 Challenge is a partnership between the Garmin Kansas City Marathon and IMT Des Moines Marathon, offering the challenge of completing both races on concurrent weekends. 

Participants can do any of the following combinations of events to complete the I-35 Challenge:

Marathon in Kansas City and Marathon in Des Moines

Marathon in Kansas City and Half Marathon in Des Moines

Half Marathon in Kansas City and Marathon in Des Moines

Half Marathon in Kansas City and Half Marathon in Des Moines

Key dates

Registration opens

Jan 1, 2026

Tier 1 ends

Feb 25, 2026

Tier 2 ends

Apr 22, 2026

Tier 3 ends

Jun 1, 2026

Tier 4 ends

Jul 31, 2026

Tier 5 ends

Sep 16, 2026

Tier 6 ends

Oct 11, 2026

5d

Registration closes

Oct 15, 2026

9d

Standard ends

Oct 15, 2026

9d

Tier 7 ends

Oct 15, 2026

9d

Race day

Oct 17, 2026

11d

Pricing

I-35 Challenge - Kansas City Marathon & Des Moines Marathon

Tier 6, then $355 from Oct 11, 2026

$325

I-35 Challenge - Kansas City Half Marathon & Des Moines Marathon

Tier 6, then $335 from Oct 11, 2026

$305

I-35 Challenge - Kansas City Marathon & Des Moines Half Marathon

Tier 6, then $310 from Oct 11, 2026

$290

I-35 Challenge - Kansas City Half Marathon & Des Moines Half Marathon

Tier 6, then $290 from Oct 11, 2026

$270

I-35 Challenge ONLY (already signed up for KC and Des Moines)

Standard, until Oct 15, 2026

$35

Email me updates about I-35 Challenge

Registration openings and major changes, like a new date or a cancellation.

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