Ultramarathons Near St. Louis, MO
As of October 6, 2026, Crewable lists 14 upcoming ultramarathons near St. Louis, MO from October 2026 to June 2027. The next is Backyard Ultra in New Town (Oct 10 8:00AM) on October 10 in Saint Charles, MO. Registration is open for 4. One advertises prize money.
Sources: UltraSignup, RunSignUp, UTMB, race organizers and race websites
With aid station data
10 aid
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2 aid13 aid
Race calendar
October 2026
5 racesBackyard Ultra in New Town (Oct 10 8:00AM)
Saint Charles, MOBackyard Ultra2.6 miPrize moneyOpen until Oct 11from $25
January 2027
2 racesFebruary 2027
1 raceMarch 2027
2 racesApril 2027
3 racesJune 2027
1 raceQuick answers
What is the next ultramarathon near St. Louis, MO?
Backyard Ultra in New Town (Oct 10 8:00AM), on Saturday, October 10, 2026, in Saint Charles, MO. Distances: Backyard Ultra, 2.6 mi.
What is the closest ultramarathon to St. Louis?
Minnie Ha Ha 6 & 12 Hour Endurance Runs in St. Louis, MO, about 1 mile from St. Louis, on October 17, 2026.
How many ultramarathons near St. Louis, MO have open registration?
4 of the 14 list registration as open as of October 6, 2026, including Backyard Ultra in New Town (Oct 10 8:00AM), DeClue Loop Trail Race and The Shippey Endurance Runs.
Which ultramarathons near St. Louis, MO offer prize money?
One race advertises prize money.
What is the busiest month for ultramarathons near St. Louis, MO?
October 2026, with 5 of the 14. April 2027 follows with 3.
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