Union Founder's Day 10K | 5K
About this race
Proceeds from the race will benefit the Union R-XI Foundation.
Join us for the 48th Annual Founder's Day Run presented by the Union R-XI Foundation. Since the Union R-XI Foundation took over this event, the race has returned to its roots with an evening start during Union's annual Founder's Day Festival. Being the oldest and longest-standing road race in Franklin County and one of the oldest in the St. Louis metro area, the Founder's Day Run has been known to be a tough race. This year will be no different.
Come early and bring your family to see what Founder's Day has to offer. Then after you finish your race grab yourself a FREE beer (21 and over) and stick around and enjoy some live music. Founder's Day is an annual family-friendly event and takes place at the courthouse square in downtown Union, MO. The celebration is sponsored by the Union Parks & Recreation Department and local businesses with the primary goal of bringing our community together to celebrate our great city. The festivities include a cornhole tournament, food trucks, music, and more.
The Union R-XI Foundation is a 501(c)(3) tax-exempt nonprofit, charitable organization that supports the students, staff, facilities, and programs of the Union R-XI School District. To learn more about the Foundation please visit https://www.rxifoundation.org/.
Early-bird registration: Now through 4/9/26
Late registration: 4/10/26 - Race Day**
Online registration ends 5/6/26
**Registrations submitted after 4/9/26 are NOT GUARANTEED A SHIRT.
Pick your distance
Running
10K
5K
Typical race-day weather
Based on 3 years of Open-Meteo archive data for this event's race dates in Union, plus the 3 days either side.
The sun rises at 5:57 AM and sets at 8:03 PM local time (CDT) in Union on May 9, 2026 — 14h 05m of daylight.
Course
No course map published yet.
The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.
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Other races near Union
Different organizers, within 40 miles, in the next three months
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Dashing through Defiance - 1 mile | 5k | 10k
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🏃 Plan Your Next Race in Union
Find upcoming events by distance:
- Union 5K Races 2 races
- 10K Run Events in Union 2 races
- Union Running Calendar 2026 2 races
Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.
- Entries, prices, waves and inclusions — the event's official registration page
- Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
- Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
- Comparisons and counts — Race Discovery calendar, 2 Union events
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