Upcoming races with 100K distance in May 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 05/09/2025 Traverse City Trail Running Festival 100K, 10K, 25K, 50K, 5K, 75K Traverse City MI michigan traverse-city-mi trail 05/31/2025 Lake to Ocean 100K 100K Port Mayaka FL florida port-mayaka-fl trail
Choose your favorite distance and save the calendar for later: Half Marathons, Marathons, Ultra Marathons, 5K, 10K, 50K, 50M, 100K, 100M
May Race Calendars:
5K Races | 10K Races |
Half Marathons | Marathons |
Ultra Marathons | Trail Races |
50K Races | 50 Miles Races |
100 Miles Races | All Races |