In 16 days · Fri, Sep 11, 2026
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Friday, September 11th, 2026
Siouxland Expo Center, Sioux City IA
10K · Half · 5K · Marathon
61–79°F · some rain risk
See last 10 years
On this date: rain 2 of the last 10 years
2025
63–84°F
dry
2024
65–86°F
dry
2023
57–74°F
dry
2022
48–74°F
dry
2021
65–90°F
dry
2020
53–59°F
rain
2019
67–83°F
rain
2018
62–79°F
dry
2017
65–82°F
dry
2016
59–77°F
dry
Best months to race in Iowa →
About this race
🏃♂️ Mighty Mo Marathon – Sioux City’s Premier Running Event
The Mighty Mo Marathon is back with an all‑new, flat, runner‑friendly three‑state course—and for the first time ever, prize money is on the line. Sioux City’s signature running event features something for every athlete:
- Events: Kids Run • 5K • 10K • Half Marathon • Full Marathon • The “STOOGE” Challenge
- Routes: All events offer flat, fast, and fun routes.
🌳 Course Details
Starting and finishing inside the Siouxland Expo Center, runners will enjoy scenic miles along the Missouri River Trail, complete with shade, smooth surfaces, and plenty of space to fly.
💰 Supporting a Cause
Proceeds support the H.A.R.T. Program (Helping Athletes Run & Train), empowering athletes of all ages and abilities.
🏞️ Course Highlights
- Half Marathon: Returns to its popular flat and fast out‑and‑back design.
- Full Marathon: Newly redesigned course with beautiful river views, abundant shade, and an indoor start/finish experience.
👉 Race Information
For more details, visit the official race page: Mighty Mo Run.
Course map
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