Upcoming races with 100K distance in September 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 09/05/2025 Dark Divide Trail Races 100K, 100M, 15M, 50K Randle WA washington randle-wa trail 09/06/2025 Hurricane 100K 100K Hurricane WV west-virginia hurricane-wv trail 09/06/2025 Pine Creek Challenge 100K, 100M, 26.2M, 50M Wellsboro PA pennsylvania wellsboro-pa trail 09/13/2025 Iron Will 100 100K, 100M, 36H, 50K, 50M Junction City KS kansas junction-city-ks trail 09/13/2025 Boulder Field 100 100K, 18M, 50K Jim Thorpe PA pennsylvania jim-thorpe-pa trail 09/13/2025 Plain Endurance Runs 100K, 100M Leavenworth WA washington leavenworth-wa trail 09/20/2025 Soldier Cutoff Hillduro – Run 100K Pisgah IA iowa pisgah-ia trail 09/27/2025 Sangre de Cristo Ultras 100K, 100M, 27K, 50K, 50M, 8M Westcliffe CO colorado westcliffe-co trail 09/27/2025 Sangre de Cristo Trail Festival 100K, 100M, 27K, 50K, 50M, 8M Westcliffe CO colorado westcliffe-co trail
Choose your favorite distance and save the calendar for later: Half Marathons, Marathons, Ultra Marathons, 5K, 10K, 50K, 50M, 100K, 100M
September Race Calendars:
| 5K Races | 10K Races |
| Half Marathons | Marathons |
| Ultra Marathons | Trail Races |
| 50K Races | 50 Miles Races |
| 100 Miles Races | All Races |
