100Ks in the USA
Indianapolis, IN
Indy Piston Endurance Run
Jun 3, 2023
Lima, OH
UnitedAF Ultramarathon
Oct 19, 2024
Nashville, IN
Dances With Dirt - Gnaw Bone
May 18, 2024
Glen Rose, TX
High Hope Endurance Run
May 25, 2024
May 26, 2024
Dinosaur Valley Endurance Run
Nov 23, 2024
Nov 24, 2024
Big Bear Lake, CA
Kodiak Ultra Marathons
Oct 11, 2024
Oct 12, 2024
Fountain Hills, AZ
Javelina Jundred
Oct 26, 2024
Georgetown, TX
Texas Ultra Running Championship
Nov 16, 2024
Easton, WA
Ultra Fest
Sep 21, 2024
Fayetteville, NY
Green Lakes Endurance Runs
Aug 24, 2024
Tyler, TX
Piney Woods Ultra
Sep 28, 2024
Honolulu, HI
Hawaii Kai Ultra Run - XTreme
Jul 27, 2024
Hawaii Kai Ultra Run - Kalama Valley
Dec 14, 2024
Dubuque, IA
Mines of Spain 100
Oct 18, 2024
Colorado Springs, CO
Ring the Springs
Jun 22, 2024
Jun 23, 2024
Ardmore, OK
Lake Murray Endurance Run
Oct 26, 2024
Jackson, MS
Big Butts
Jul 20, 2024
Cerritos, CA
Orange Curtain
Jun 22, 2024
Jun 21, 2024
McClellanville, SC
Swamp Fox Ultra
Nov 16, 2024
Bandera, TX
Bandera Endurance Trail Race
Jan 11, 2025
Rocky Point, NY
Tesla Hertz Run
Oct 12, 2024
Longview, TX
Grace Creek Grinder
Feb 3, 2024
Toledo, OH
Miakonda Trail Ultra
Sep 2, 2023
Bethel, OH
East Fork 100M/100K
Aug 24, 2024
Stinson Beach, CA
Miwok 100K
May 4, 2024
Stillwater, OK
Lake McMurtry Run
Apr 13, 2024
Shawnee, KS
Tale of Two Trails
Jul 15, 2023
Ottawa, KS
Prairie Spirit Trail Ultra Races
Mar 23, 2024
Kansas Rails-to-Trails Extravaganza
Oct 26, 2024
Springville, UT
Kat'cina Mosa 100K Mountain Run
Aug 3, 2024
Traverse City, MI
Traverse City Trail Running Festival
May 11, 2024
May 10, 2024
Virgil, NY
Virgil Crest Ultras
Sep 14, 2024
Las Cruces, NM
Sierra Vista Trail Runs
Mar 2, 2024
Homer, AK
Homer Epic
Mar 9, 2024
Ashland, OR
Siskiyou Out Back Trail Run
Jul 13, 2024
Comfort, TX
Dos Senderos
Mar 2, 2024
Norman, OK
Thunderbird Trail Run
Nov 9, 2024
Madison, WI
MadCity Ultras
Apr 20, 2024
Salmon, ID
Beaverhead Endurance Runs
Jul 13, 2024
Lake Hughes, CA
Leona Divide
Apr 20, 2024
Hilo, HI
Under the Moon
Jun 22, 2024
Ipswich, MA
TARC Stone Cat Trail Festival
Nov 2, 2024
Hot Springs, AR
Run LOViT
Feb 24, 2024
Feb 23, 2024
Bishop, CA
Bishop High Sierra Ultras
May 18, 2024
Brooksville, FL
Croom Zoom
Jan 6, 2024
Beaver Falls, PA
Rabid Raccoon 100
Mar 16, 2024
Peninsula, OH
Fools Trail Race
May 25, 2024
Huntsville, TX
Rocky Raccoon 100 Trail Race
Feb 1, 2025
Plain, WA
Plain Endurance Runs
Sep 14, 2024
Pinckney, MI
Run Woodstock
Sep 6, 2024
Sep 7, 2024
Sep 8, 2024
Goodyear, AZ
Fat Ox
Nov 22, 2024
Kings Mountain, NC
Beast of the East 100
Dec 14, 2024
Martinsville, IN
MoMoFo100
Jun 7, 2024
San Angelo, TX
Crazy Desert Trail Race
Mar 2, 2024
Oakridge, OR
Waldo 100K
Aug 3, 2024
New Preston, CT
Jack Bristol Lake Waramaug Ultra Races
Apr 28, 2024
La Grange, WI
Kettle Moraine 100 Endurance Runs
Jun 8, 2024
Cumberland, RI
Survival of the F.I.T.test 24 Hour Trail Ultra
Oct 21, 2023
Albion, IN
Indiana Trail 100
Oct 12, 2024
San Antonio, TX
Medusa 100
Nov 4, 2023
West Columbia, TX
Grit Ultra Endurance Challenge
Dec 31, 2023
Massillon, OH
Whispering Grace 100
Nov 11, 2023
Jim Thorpe, PA
Boulder Field Ultra
Sep 14, 2024
San Diego, CA
Sycamore Canyon Trail Race
Feb 24, 2024
Pensacola, FL
Wildcat Ultras
Aug 31, 2024
Cassoday, KS
Heartland
Oct 12, 2024
Oct 11, 2024
Triangle, VA
Devil Dog Ultras
Dec 2, 2023
Hollidaysburg, PA
Ironstone 100K
Jul 13, 2024
New Gloucester, ME
Trail Festival at Pineland Farms
May 25, 2024
May 26, 2024
Castro Valley, CA
Dick Collins Firetrails
Sep 28, 2024
Titusville, PA
Oil Creek 100 Trail Runs
Oct 12, 2024
Fairplay, CO
Silverheels Trail Runs
Jul 12, 2024
Jul 13, 2024
Tahlequah, OK
Pumpkin Holler Hunnerd
Oct 19, 2024
Waynesville, MO
Bad Dawg Ultra
Aug 17, 2024
Mesquite, NV
Grandmaster Ultras
Feb 16, 2024
Feb 17, 2024
Beaver, UT
Tushars Mountain Runs
Jul 27, 2024
Burns, TN
Mo' Bell
Oct 12, 2024
Needville, TX
Brazos Bend 100
Dec 7, 2024
Paris, TX
Paris Pair
Sep 21, 2024
Wellsboro, PA
Pine Creek Challenge
Sep 7, 2024
Farmville, VA
Freight Train 50K/100K
Dec 7, 2024
Cascade Locks, OR
Gorge Waterfalls
Apr 14, 2024
Apr 13, 2024
Blue Diamond, NV
Red Rock Canyon 100K
Nov 9, 2024
Shenandoah, VA
Grindstone
Sep 20, 2024
Sep 21, 2024
North Bonneville, WA
Strawberry Fields Forever
Jun 22, 2024
Bolivar, OH
5 Lakes Ultra Race
Aug 5, 2023
Middleville, MI
Yankee Springs Trail Run
May 31, 2024
Jun 1, 2024
Belleville, WI
Badger Trail Races
Aug 3, 2024
Aug 4, 2024
Gold Beach, OR
Secret Beach 100K/50M
May 11, 2024
Jacksboro, TX
North Texas Ultra
Feb 15, 2025
Smithland, KY
Herzog 100
Apr 20, 2024
High Ridge, MO
The Shippey Endurance Runs
Jan 18, 2025
Jan 19, 2025
Mayer, AZ
Black Canyon Ultras
Feb 10, 2024
Waimea, HI
Under the Moon
Jun 22, 2024
Canal Fulton, OH
Eagle Up Ultra
Jun 1, 2024
Mayfield, OH
Conquer the Castle
Nov 2, 2024
Sylvan Grove, KS
Hell Creek 100
Sep 28, 2024
Friant, CA
San Joaquin River Trail Run
Dec 7, 2024
Foresthill, CA
Canyons Endurance Runs
Apr 26, 2024
Apr 27, 2024
Norton, VA
Cloudsplitter 100
Oct 12, 2024
Lakeshore, CA
China Peak Running Festival
Sep 7, 2024
Cat Spring, TX
Habanero Hundred
Aug 24, 2024
Natural Bridge, VA
Hellgate 100K
Dec 14, 2024
Booneville, IA
Booneville Backroads Ultra
Aug 31, 2024
Butte Meadows, CA
Loco Go Big or Go Home Challenge
Jun 1, 2024
Naples, NY
Twisted Branch Trail Run
Aug 24, 2024
Sky Valley, GA
Sky to Summit Trail Run
Oct 26, 2024
Port Gamble, WA
Lumberjack Endurance Runs
Jun 8, 2024
Hurricane, WV
Hurricane 100K
Sep 7, 2024
Logandale, NV
Fire Fest Ultra
Nov 23, 2024
Nov 24, 2024
Nov 22, 2024
Divide, CO
Great Divide Ultra
Jun 1, 2024
Jun 2, 2024
Keithville, LA
Screaming Monkey 100
Nov 2, 2024
Forksville, PA
Worlds End Ultramarathon
Jun 1, 2024
Fort Pierce, FL
Saint Lucie Skeeter Skoot
Nov 23, 2024
Quitaque, TX
Wild Canyon Ultra
Apr 6, 2024
Blacksburg, SC
Mountaineer Rumble
Nov 2, 2024
Forest City, IL
Temptation 200 Ultras
Aug 31, 2024
Sep 1, 2024
Chesterfield, MA
Chesterfield Gorge Ultra and 25K Race
Jun 1, 2024
Jun 2, 2024
Apple Valley, UT
Zion Ultras
Apr 13, 2024
Apr 14, 2024
Vesuvius, VA
UROC
Apr 27, 2024
Davis, OK
Arbuckle 100
Apr 6, 2024
Silver Hill Meadow, VT
Vermont 100 Endurance Race
Jul 19, 2024
Hinckley, MN
Fire Tower Trail Races
Oct 5, 2024
Brazos Bend State Park, TX
Brazos Bend 50
Apr 6, 2024
Hyner Run State Park, PA
Black Forest Ultra 100K
Oct 6, 2024
Middlesex, NY
Great Hill Ultra
Jul 13, 2024
Durham, KS
Santa Fe Jornado
Jan 27, 2024
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City Location
101. American Birkebeiner Trail Run
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Sep 28, 2024Saturday
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100K, 26.2M, 13.1M, 5K trail run | 100K, 26.2M relay
More Information
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Cable, WI
Bayfield County, WI
102. Bear Chase Race - Half Marathon & 10K
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Sep 28, 2024Saturday
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100K, 50M, 50K trail run
More Information
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Lakewood, CO
Jefferson County, CO
103. Dick Collins Firetrails
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Sep 28, 2024Saturday
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100K, 50M, 26.2M trail run
More Information
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Castro Valley, CA
Alameda County, CA
104. Hell Creek 100
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Sep 28, 2024Saturday
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140M, 100M, 100K, 20M trail run
More Information
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Sylvan Grove, KS
Lincoln County, KS
105. Piney Woods Ultra
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Sep 28, 2024Saturday
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100K, 50K, 25K, 10K, 5K trail run
More Information
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Tyler, TX
Smith County, TX
106. Sangre de Cristo Ultras
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Sep 28, 2024Saturday
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100M, 100K, 50K trail run
More Information
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Westcliffe, CO
Custer County, CO
107. Fire Tower Trail Races
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Oct 5, 2024Saturday
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100K, 50K, 35K, 11K trail run
More Information
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Hinckley, MN
Pine County, MN
108. Black Forest Ultra 100K
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Oct 6, 2024Sunday
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100K trail run
More Information
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Hyner Run State Park, PA
Clinton County, PA
109. Cloudsplitter 100
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Oct 12, 2024Saturday
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100M, 100K, 50K, 25K trail run | 100M relay
More Information
- Norton, VA
110. Heartland
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Oct 12, 2024Saturday
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100M, 100K, 50M, 26.2M, 13.1M trail run
More Information
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Cassoday, KS
Butler County, KS
111. Indiana Trail 100
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Oct 12, 2024Saturday
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100M, 100K, 50M trail run
More Information
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Albion, IN
Noble County, IN
112. Kodiak Ultra Marathons
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Oct 12, 2024Saturday
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100K, 50K, 21K trail run
More Information
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Big Bear Lake, CA
San Bernardino County, CA
113. Mo' Bell
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Oct 12, 2024Saturday
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24H, 100M, 75M, 12H, 100K, 50M, 50K, 26.2M, 13.1M, 10K, 5K, 1M run | 24H, 12H relay
More Information
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Burns, TN
Dickson County, TN
114. Oil Creek 100 Trail Runs
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Oct 12, 2024Saturday
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100M, 100K, 50K, 25K trail run
More Information
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Titusville, PA
Crawford County, PA
115. Tesla Hertz Run
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Oct 12, 2024Saturday
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100M, 100K, 50M, 50K, 10M trail run
More Information
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Rocky Point, NY
Suffolk County, NY
116. Mines of Spain 100
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Oct 18, 2024Friday
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100M, 100K trail run
More Information
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Dubuque, IA
Dubuque County, IA
117. Pumpkin Holler Hunnerd
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Oct 19, 2024Saturday
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100M, 100K, 50K, 25K, 10M trail run
More Information
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Tahlequah, OK
Cherokee County, OK
118. UnitedAF Ultramarathon
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Oct 19, 2024Saturday
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100M, 100K, 50M, 50K run | 100M relay
More Information
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Lima, OH
Allen County, OH
119. Wild Duluth Races - Wild Duluth 100K/50K, Harder 'n Heck Half & Terribly Tough 10K
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Oct 19, 2024Saturday
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100K, 50K trail run
More Information
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Duluth, MN
St Louis County, MN
120. Javelina Jundred
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Oct 26, 2024Saturday
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100M, 100K, 31K trail run
More Information
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Fountain Hills, AZ
Maricopa County, AZ
For the love of all that Is good And moisture wicking...
Though we Try To be accurate And On top Of things... Race details can change When we aren't lookin. And once in a while we simply make a mistake.
ALWAYS visit the race's website for the most complete and accurate race information.
ALWAYS visit the race's website for the most complete and accurate race information.