Upcoming races with 100 miles 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 05/07/2025 Peak Blood Root Ultra 100M, 10M, 200M, 50K, 50M Pittsfield VT vermont pittsfield-vt trail 05/09/2025 Tillamook Burn Trail Run 100M, 20M, 50K, 50M Timber OR oregon timber-or trail 05/15/2025 Infinitus Trail Race 100M, 250M, 26.2M, 888K, 88K, 9M Ripton VT vermont ripton-vt 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 |
100K Races | All Races |