100mi events in the United States
Find 100mi events in the United States. Compare 91 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 Ozark Foothills Endurance Runs, Potawatomi Trail Runs and Zion Ultras.
Narrow your search to California, Florida and Arizona, or browse the other locations below.
Compare running races by distance, date and surface, from shorter road events to trail races and ultras.
103 listed events · 91 with upcoming dates
Upcoming 100mi events
91 matching events, earliest date first. Entry availability is shown separately.
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.
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.
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.
Froggy Mountain 100
USAGalax, Virginia
Mountain ultras on a steep one-mile private forest trail loop.
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.
Devil's Gulch
USAWenatchee, Washington
Mountain trail ultras and a half marathon from Mission Ridge.
Date listed · latest organiser confirmation not yet checked.
Vero Beach Octopus Ultra
USAVero Beach, Florida
Ultras through the exposed and shaded trails around Vero Beach.
Date listed · latest organiser confirmation not yet checked.
Rise in the Pines
USASmithville, Texas
Loop trail races through the pine woods of Rocky Hill Ranch.
Date listed · latest organiser confirmation not yet checked.
Standhope Ultra Challenge
USAKetchum, Idaho
Remote high-altitude trail races in Idaho’s Pioneer Mountains.
Date listed · latest organiser confirmation not yet checked.
Badger Trail Races by Ten Junk Miles Racing
USABelleville, Wisconsin
Rail-trail races on the Badger State and Jane Addams trails.
Date listed · latest organiser confirmation not yet checked.
Burning River Endurance Run
USACuyahoga Falls, Ohio
Ultras and a marathon through the Cuyahoga Valley and Summit Metro Parks.
· Status TBC
Date listed · latest organiser confirmation not yet checked.
Loopy Looper
USAPennsauken, New Jersey
Timed races and a 100-miler around Cooper River Park, with a shorter night loop.
· Status TBC
Date listed · latest organiser confirmation not yet checked.
Shawnee Hills Trail Races
USAOzark, Illinois
Technical trail ultras through the sandstone hills and forests around Camp Ondessonk.
Date listed · latest organiser confirmation not yet checked.
Front Range Ultra Dayze
USALoveland, Colorado
Multi-day ultras on a two-mile mixed-surface loop through Centennial Park and Rivers Edge Natural Area.
Date listed · latest organiser confirmation not yet checked.
Wildcat Ultras
USAPensacola, Florida
Ultras on a flat grass and dirt loop at the Escambia County Equestrian Center.
· Status TBC
Date listed · latest organiser confirmation not yet checked.
Mogollon Monster
USAPine, Arizona
Mountain trail races around the Mogollon Rim.
· Status TBC
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 (12) →