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Organized by Mainly Marathons Event Organizer

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  • Distance: 37.9 km from South Sioux City
    Sat, Jul 25, 2026 at 7:00 AM

    Join us for the Heatwave Half Marathon, 10K, & 5K!

    A sun-soaked summer challenge that’s perfect for the whole family.

    The fun includes –

    • Great Swag – designer shirt & custom medal

    • Chip-timing with live results and awards

    • Free photos

    • FREE ice cream at the finish to help you cool off

    • Plenty of hot fun in the summer sun!

    Grab your friends and family—you won’t want to miss this one!

    Can’t make the race? No problem! We offer a virtual race option where you can run anywhere, at any time, and still earn the fun swag!

    Youth-based pricing is available: ages 12 & under are only $17!

    Half Marathon/10K/5K registration includes a custom bib, designer shirt, and an awesome finisher medal!

    1 Mile registration is untimed and includes a custom bib, designer shirt, and an awesome finisher medal!

    Kid’s Dash is a fun, untimed dash for ages 10 and under. Registration includes a mini bib, youth-sized shirt, and a specially crafted medal for our youngest runners! (If your child wants to run the kid’s dash without swag, they’re welcome to run free on race day!)

    Register by midnight on Thursday, two Thursdays before race day, to guarantee your shirt!

    See full details
    1 Miles5k10k13.1 MilesHalf MarathonRunVirtual via RunSignup
  • Distance: 5.3 km from South Sioux City
    Fri, Sep 11, 2026 at 6:30 PM

    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: Kids Run • 5K • 10K • Half Marathon • Full Marathon • The “STOOGE” Challenge All events offer flat, fast, and fun routes.

    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.

    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 experienc

    See full details
    5k10k13.1 Miles26.2 MilesIndoorRunTrail via RunSignup
  • Distance: 37.9 km from South Sioux City
    Sat, Sep 19, 2026 at 8:00 AM

    Join us for the annual Hometown Half Marathon & 5k/10k! A run local-themed event that is perfect for the whole family.

    The fun includes -

    • Great Swag - designer shirt & custom medal

    • Chip-timing with live results and awards

    • Pacers for the half marathon

    • Free photos

    • Delicious Treats waiting at the finish line

    • Plenty of fun!

    *Youth-based pricing for the 5k/10k, 12 & Under are only $17!

    • Half Marathon Registration includes a custom bib, designer shirt, and an awesome finisher medal!

    • 10k registration includes a custom bib, designer shirt, and an awesome finisher medal!

    • 5k registration includes a custom bib, designer shirt, and an awesome finisher medal!

    • 1 Mile registration is untimed and includes a custom bib, designer shirt, and an awesome finisher medal!

    • The kid's dash is a fun, untimed dash for our kiddos ages 10 and under. Registration includes a mini bib, youth-sized shirt, and a specifically crafted medal for our kids' dash event! (If your child wants to run the kid's dash, and doesn't want the SWAG, they are welcome to run with us on race day for free!)

    *Register by midnight on Thursday, two Thursdays before race day, to guarantee your shirt!

    See full details
    1 Miles3.1 Miles5k6.2 Miles10k13.1 MilesHalf MarathonRun via RunSignup
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