Missouri · Marathon · Half Marathon
I-35 Challenge
I-35 Challenge is a marathon and half marathon event held in Kansas City, Missouri. It was last held on October 17, 2026 and is usually run in October; the next date hasn't been announced yet.
- Usually held
- October
- Location
- Kansas City, MO
Race details
- Last held
- October 17, 2026
- Usually held in
- October
- Location
- Kansas City, Missouri
- Distances
- Marathon, Half Marathon
- Registration
- runsignup.com
- Official website
- i35challenge.com
Registration, course & weather
About the I-35 Challenge
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
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Keep exploring
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- Fall Marathons
- October Marathons
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Guides from the RaceRove blog
- 8 min read How to Choose Your First Marathon A practical checklist for choosing a first marathon based on course, weather, cutoff, travel, field size and support.
- 7 min read How to Find a 5K, 10K, Half Marathon or Marathon Near You A practical way to find running races near you: pick a distance, decide how far you'll travel, read the listing properly and confirm the details before you register.
- 9 min read How to Run a Race in All 50 States How to plan a 50-state running challenge: set your own rules, group states into trips, build a calendar around the seasons, budget for it and keep track of every finish.
- Blog All guides Planning advice for finding, choosing and travelling to races.
I-35 Challenge: common questions
- When is the I-35 Challenge?
- The next date hasn't been announced in the listing yet. The race is usually held in October. Check the organiser's website for the official date.
- Where is the I-35 Challenge held?
- In Kansas City, Missouri.
- What distances does the I-35 Challenge offer?
- Marathon and Half Marathon.
- How do I register for the I-35 Challenge?
- Registration is handled by the organiser at runsignup.com. Entry fees, caps and deadlines are set there.
- Is registration open for the I-35 Challenge?
- Registration status as last checked September 22, 2026: open. Listed fee for the longest distance, $325 (from runsignup.com, checked September 22, 2026).
Plan this race in RaceRove
Save it to your plan, compare it with other races, check typical race-day weather and track your 50-state progress in the interactive app.