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Your complete St. Charles 2025 marathon calendar. Find every marathon happening in St. Charles, Missouri in 2025 with comprehensive race details, registration information, and official results, including the Weldon Spring Trail Marathon, and MO' Cowbell Marathon.
Each marathon listing includes a 2025 marathon guide including dates, locations, course details, weather conditions, and relevant links for registration and more information. We maintain the most current results database, publishing official results on race day, plus complete 2024 results for year-to-year comparison.
St. Charles, Missouri
March 22, 2025
The Weldon Spring Trail Marathon guides runners through a captivating blend of wooded paths, scenic overlooks, and serene water features, nestled within the iconic Lewis and Clark Trail system. Set in the picturesque Weldon Spring Conservation Area, this marathon is a favorite for trail enthusiasts seeking a challenging yet rewarding experience amid Missouri's natural beauty.
St. Charles, Missouri
October 5, 2025
The MO' Cowbell Marathon in St. Charles, Missouri, features a mostly flat, looped course that navigates both urban and rural landscapes, with highlights including the scenic Katy Trail and a crossing of the iconic Missouri River. Known for its festive, community-driven atmosphere, this Boston-qualifying race offers runners a unique blend of challenging segments, lively cowbell-wielding supporters, and rewarding post-race festivities.