Marathons in Missouri
As of October 6, 2026, Crewable lists 7 upcoming marathons in Missouri from October 2026 to December 2026. The next is DeClue Loop Trail Race on October 10 in Wildwood. Registration is open for 6.
Sources: UltraSignup, RunSignUp, UTMB, race organizers and race websites
Race calendar
October 2026
4 racesShow Me Your Free State Marathon and Ultra
St. Joseph, MO552 ft gain100 mi50 mi+3Open until Oct 16from $90
November 2026
2 racesMO' Cowbell Marathon/Half-Marathon/10K/5K
Saint Charles, MOMarathonHalf Marathon+2Open until Nov 8from $35
December 2026
1 raceQuick answers
What is the next marathon in Missouri?
DeClue Loop Trail Race, on Saturday, October 10, 2026, in Wildwood. Distances: 50K, Marathon, 16 mi.
How many marathons in Missouri have open registration?
6 of the 7 list registration as open as of October 6, 2026, including DeClue Loop Trail Race, Garmin Kansas City Marathon and I-35 Challenge.
What is the busiest month for marathons in Missouri?
October 2026, with 4 of the 7. November 2026 follows with 2.
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