Upcoming races with 100K distance in October across the USA. Use filters to quickly find races by state, city or race type.
More races:ย USA running calendar
Date Race Distance Location hf:tax:state hf:tax:city hf:tax:typerace 10/04/2025 Bear Chase Race – Half Marathon 100K, 10K, 13.1M, 50K, 50M Lakewood CO colorado lakewood-co trail 10/04/2025 Fire Tower Trail Races 100K, 11K, 35K, 50K Hinckley MN minnesota hinckley-mn trail 10/04/2025 Dana Peak Trail Run 100K, 10K, 20K, 50K Harker Heights TX texas harker-heights-tx trail 10/10/2025 Tesla Hertz Run 100K, 100M, 10M, 150M, 50K, 50M Rocky Point NY new-york rocky-point-ny trail 10/12/2025 The Dawnland 100K 100K Norway ME maine norway-me trail 10/18/2025 Pumpkin Holler Hunnerd 100K, 100M, 10M, 25K, 50K Tahlequah OK oklahoma tahlequah-ok trail 10/18/2025 Wild Duluth Races 100K, 10K, 13.1M, 50K Duluth MN minnesota duluth-mn trail 10/25/2025 Lake Murray Endurance Run 100K, 100M, 25K, 50K, 5M Ardmore OK oklahoma ardmore-ok trail 10/25/2025 Canyonlands Ultra 100K, 13.1M, 15K, 26.2M, 50K, 50M Moab UT utah moab-ut trail 10/25/2025 Kansas Rails-to-Trails Extravaganza 100K, 100M, 13.1M, 26.2M, 50K, 50M, 5M Ottawa KS kansas ottawa-ks trail 10/25/2025 Javelina Jundred 100K, 100M Fountain Hills AZ arizona fountain-hills-az trail
Choose your favorite distance and save the calendar for later: Half Marathons, Marathons, Ultra Marathons, 5K, 10K, 50K, 50M, 100K, 100M
October Race Calendars:
| 5K Races | 10K Races |
| Half Marathons | Marathons |
| Ultra Marathons | Trail Races |
| 50K Races | 50 Miles Races |
| 100 Miles Races | All Races |
