Explore by location
100mi events around the world
Build your racing calendar, close to home or further afield. Compare 106 upcoming events by date and location. Open a race guide for the course, recorded editions and official entry information where available.
Events to explore include Thunder Kiss, Viper 100 and Grasslands Trail Run.
Start with a continent, including North America and Europe.
Compare running races by distance, date and surface, from shorter road events to trail races and ultras.
121 listed events · 106 with upcoming dates
Upcoming 100mi events
106 matching events, earliest date first. Entry availability is shown separately.
Thunder Kiss
USASterrett, Alabama
Trail ultras and a twenty-mile race on the ridges of Double Oak Park.
Date listed · latest organiser confirmation not yet checked.
Viper 100
USACordova, Tennessee
Ultras on a mixed trail and paved loop through Shelby Farms Park.
Date listed · latest organiser confirmation not yet checked.
Grasslands Trail Run
USAAlvord, Texas
Trail races on the rolling woodland and grassland trails of the LBJ National Grasslands.
Date listed · latest organiser confirmation not yet checked.
Leatherwood Ultras
USAFerguson, North Carolina
Hilly trail ultras on private trails in the Leatherwood Mountains.
Date listed · latest organiser confirmation not yet checked.
Camp Croft Ultras
USASpartanburg, South Carolina
Loop trail ultras and a shorter race in Croft State Park.
Date listed · latest organiser confirmation not yet checked.
Ozark Foothills Endurance Runs
USAWildwood, Missouri
Trail races through the hills of Wildwood, with Friday night and Sunday options.
Date listed · latest organiser confirmation not yet checked.
Potawatomi Trail Runs
USAPekin, Illinois
Trail races on a hilly ten-mile loop in McNaughton Park.
Date listed · latest organiser confirmation not yet checked.
Zion Ultras
USAApple Valley, Utah
Desert trail races around Apple Valley near Zion National Park.
Date listed · latest organiser confirmation not yet checked.
Run4Kids Ultra Running Party
USACorona, California
Timed and fixed-distance charity races supporting youth running.
Date listed · latest organiser confirmation not yet checked.
Chester Ultra 100
ENGChester
Running event in Chester.
· Status TBC
Date listed · latest organiser confirmation not yet checked.
Leona Divide
USALake Hughes, California
Mountain trail ultras and a 30K starting in Lake Hughes.
Date listed · latest organiser confirmation not yet checked.
Lumberjack 100
USAPort Gamble, Washington
Loop trail ultras through the Port Gamble uplands.
Date listed · latest organiser confirmation not yet checked.
Silver Moon Race
USAReedley, California
Evening and overnight races on a flat loop beside the Kings River.
Date listed · latest organiser confirmation not yet checked.
Coyote Two Moon
USAOjai, California
Mountain ultras through Los Padres National Forest above Ojai.
Date listed · latest organiser confirmation not yet checked.
Salt Flats Endurance Runs
USAWendover, Utah
Ultras across the Bonneville Salt Flats and surrounding hills, with a shorter fun run.
Date listed · latest organiser confirmation not yet checked.
Centurion Thames Path 100
ENGLondon, Greater London
Centurion Thames Path 100 — a verified UTMB Index race for the 2026 edition.
Date listed · latest organiser confirmation not yet checked.
Ultra X Scotland
SCOInverness, Highlands
Ultra X Scotland in Inverness.
Date listed · latest organiser confirmation not yet checked.
Cocodona
USABlack Canyon City, Arizona
Point-to-point ultras across the mountains and desert of central and northern Arizona.
Date listed · latest organiser confirmation not yet checked.
Born to Run Ultra Marathons
USALos Olivos, California
A trail-running festival on dirt ranch roads and singletrack near Los Olivos.
Date listed · latest organiser confirmation not yet checked.
The Underground Circus 100
USASmyrna, Georgia
Ultras and timed races on the Silver Comet Trail at Smyrna.
Date listed · latest organiser confirmation not yet checked.
Hell Hole Hundred
USABethera, South Carolina
Summer trail ultras and shorter races in Francis Marion National Forest.
Date listed · latest organiser confirmation not yet checked.
Eagle Up Ultra
USACanal Fulton, Ohio
Endurance races on a flat limestone towpath loop from St Helena Park.
Date listed · latest organiser confirmation not yet checked.
Weld Your Mettle Running Festival
USAEaton, Colorado
Loop running races and timed endurance challenges near Eaton.
Date listed · latest organiser confirmation not yet checked.
Centurion South Downs Way 100
ENGWinchester, Hampshire
Centurion South Downs Way 100 in Winchester.
Date listed · latest organiser confirmation not yet checked.
Froggy Mountain 100
USAGalax, Virginia
Mountain ultras on a steep one-mile private forest trail loop.
Date listed · latest organiser confirmation not yet checked.
Phoenix Centaur 100 Mile Ultra
ENGDorking, Surrey
Phoenix Centaur 100 Mile Ultra in Dorking.
Date listed · latest organiser confirmation not yet checked.
Moray Way 100 & Relay
SCOForres, Moray
Moray Way 100 & Relay — 100mi at The Moray Way.
Date listed · latest organiser confirmation not yet checked.
Western States Endurance Run
USAOlympic Valley, California
The world’s oldest 100-mile trail race, from Olympic Valley to Auburn.
· Status TBC
Date listed · latest organiser confirmation not yet checked.
Hardrock Hundred
USASilverton, Colorado
High-altitude 100-mile loop through the San Juan Mountains.
· Status TBC
Date listed · latest organiser confirmation not yet checked.
Siskiyou Out Back Trail Runs
USAAshland, Oregon
Mountain trail races around Ashland and the Siskiyou Crest.
Date listed · latest organiser confirmation not yet checked.
Race archive
Past races and previous editions
Looking back at a race? Browse the guides below for recorded editions. This section also includes events awaiting a new date and cancelled editions. Previous editions of races in the upcoming calendar are available through their race guides above.
Open the race archive to browse past events and races awaiting a new date.
View full race archive (15) →