In 201 days · Mon, May 10, 2027
Don't let race day sneak up
One email during race week. That's it.
Monday, May 10th, 2027
700 West 39th Street, South Sioux City NE
5K · 10K · Marathon · Half
50–72°F · some rain risk
See last 10 years
On this date: rain 1 of the last 10 years
2026
41–71°F
dry
2025
62–89°F
dry
2024
47–73°F
dry
2023
57–82°F
dry
2022
59–78°F
dry
2021
39–63°F
dry
2020
37–52°F
dry
2019
35–60°F
dry
2018
53–68°F
dry
2017
53–65°F
rain
Best months to race in Nebraska →
About this race
World's Best Marathon & Half Series!
No Time Limits
Great Food
Award-Winning Medals
Loony Community!
We RUN this country, TOGETHER!
Event details and schedule
Thanks for running with Mainly Marathons! Take a look at our website for additional details about this series and our other series of races.
Also, join our Facebook group to stay up-to-date with our loony adventures: Main Group and Prairie Series.
If you're interested in some Mainly Merch, check out our online store HERE. We'll offer some items (hats, stickers, magnets, mugs, etc.) in-person at the races, the Mainly Merch store best option for a variety of fun designs and quality merchandise to showcase your loonacy!
If you have any questions, email [email protected]
We RUN this country, TOGETHER!
Course map
Train with a club
Run clubs near South Sioux City to train with before race day.
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