In 284 days · Wed, Jul 14, 2027
Don't let race day sneak up
One email during race week. That's it.
When
Wednesday, July 14th, 2027
Where
25th Ave. N. and Grant St., Clinton IA
Distances
Marathon · 5K · Half · 10K
Typical weather
67–83°F · some rain risk
See last 10 years
On this date: rain 5 of the last 10 years
2026
68–90°F
dry
2025
64–82°F
dry
2024
70–88°F
rain
2023
67–87°F
rain
2022
63–83°F
dry
2021
67–83°F
rain
2020
67–86°F
dry
2019
73–87°F
rain
2018
73–82°F
rain
2017
62–79°F
dry
Best months to race in Iowa →
Gear up
Going long? The fueling guide — gels, chews, and how to carry them →
About this race
Event Overview
- Race Series: World's Best Marathon & Half Series!
- Time Limits: No Time Limits
- Food: Great Food
- Medals: Award-Winning Medals
Community Spirit
- Vibe: Loony Community!
- Slogan: We RUN this country, TOGETHER!
Event Details and Schedule
- Date: July 14, 2027
- Location: 25th Ave. N. and Grant St., Clinton, IA
- More Information: Check out the Heartland Series for additional information about the series.
- Other Events: Visit our website for details about other Mainly Marathons' series.
Merchandise
- Shop: If you're interested in Mainly Merch, check out our online store.
Thank You!
-Mainly Family
Course map
Train with a club
Run clubs near Clinton to train with before race day.
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