Ultramarathons in Missouri
As of October 6, 2026, Crewable lists 27 upcoming ultramarathons in Missouri from October 2026 to August 2027. The next is Backyard Ultra in New Town (Oct 10 8:00AM) on October 10 in Saint Charles. Registration is open for 6. 2 advertise prize money.
Sources: UltraSignup, RunSignUp, UTMB, race organizers and race websites
With aid station data
10 aid
1 aid
4 aidin 18 days
Show Me Your Free State Marathon and Ultra
St. Joseph, MO552 ft gain
100 mi50 mi+3
Open until Oct 16from $90
4 aid.jpg)
2 aidRace calendar
October 2026
10 racesBackyard Ultra in New Town (Oct 10 8:00AM)
Saint Charles, MOBackyard Ultra2.6 miPrize moneyOpen until Oct 11from $25Show Me Your Free State Marathon and Ultra
St. Joseph, MO552 ft gain100 mi50 mi+3Open until Oct 16from $90
November 2026
1 raceDecember 2026
2 racesJanuary 2027
3 racesFebruary 2027
3 racesMarch 2027
2 racesApril 2027
4 racesJune 2027
1 raceAugust 2027
1 raceQuick answers
What is the next ultramarathon in Missouri?
Backyard Ultra in New Town (Oct 10 8:00AM), on Saturday, October 10, 2026, in Saint Charles. Distances: Backyard Ultra, 2.6 mi.
How many ultramarathons in Missouri have open registration?
6 of the 27 list registration as open as of October 6, 2026, including Backyard Ultra in New Town (Oct 10 8:00AM), DeClue Loop Trail Race and Find Your Strength Endurance Race.
Which ultramarathons in Missouri offer prize money?
2 races advertise prize money.
What is the busiest month for ultramarathons in Missouri?
October 2026, with 10 of the 27. April 2027 follows with 4.
Cities in Missouri
Neighboring states
More ways to browse
Race planning
Plan your Missouri race
Aid stations, cutoffs and pacing in one free plan. Crew invites and race-day updates come with a Race Pass.
Plan a race free