The Great GO! St. Louis Halloween Race
GO! St. Louis takes its costume-heavy fall race weekend to Eureka, where the half follows country roads along the Meramec River into Route 66 State Park.
Every link above goes to the race, its timing provider, or an official registration partner. Last checked July 26, 2026.
Quick facts
- Organized by GO! St. Louis, the nonprofit behind the region's largest race weekends.
- Half marathon course runs river-valley country roads into Route 66 State Park.
- Costume contest culture with a two-day schedule, including a dog-friendly mile.
- Late-October date usually brings cold starts and crisp racing weather.
2026 The Great GO! St. Louis Halloween Race registration
Registration for the 2026 The Great GO! St. Louis Halloween Race runs through the official registration page at runsignup.com.
About the The Great GO! St. Louis Halloween Race
GO! St. Louis, the nonprofit behind several of the region's biggest race weekends, stages its Halloween event from Eureka's business district. Costumes are the point, with a contest and trick-or-treat village around the racing. Sunday belongs to the half marathon and 10K, while Saturday holds the 5K, fun run, and a costume dog walk.
Course
The half leaves Eureka's business district for country roads along the Meramec River, then takes a path under I-44 for a loop on Blakey Road inside Route 66 State Park before returning. It runs quieter and more rural than the organizer's city races, with the river valley setting doing most of the scenery work.
Race-day weather
Late October mornings near the Meramec often start in the 30s or 40s, with frost possible at the start and mild air by midday. Layers that can be shed matter more than heat planning.
Past The Great GO! St. Louis Halloween Race dates and results
| Year | Date | Status | Results |
|---|---|---|---|
| 2026 | Sunday, October 25, 2026 | Upcoming | — |
The Great GO! St. Louis Halloween Race FAQ
When is the The Great GO! St. Louis Halloween Race?
The 2026 The Great GO! St. Louis Halloween Race is on Sunday, October 25, 2026.
How do I register for the The Great GO! St. Louis Halloween Race?
Register for the The Great GO! St. Louis Halloween Race through the official registration link: marathonscout.com/go/great-go-st-louis-halloween-race/register. It opens the race registration page at runsignup.com.
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