Run100s ("Run Hundreds") - A Not-For-Profit UltraRunning Corporation

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Schedule of the (approx.) 273 North American 100-milers: (Map of the start lines)
Anchor Down // Ancient Oaks // Angeles Crest // Antelope Island Buffalo Run // Arkansas // Baby Dragon // BAD DAWG // Badger Trail // Badger Mt. // Bay Area // The Bear // Beast of Burden(Summer) // Beast of Burden(Winter) // Beast of the East // Big Deal // Big Al's // Biggest Little Ultra // Bighorn // Black Hills // Blackbeard's Revenge // Blood Rock // Bloodroot // Blue Heron // Boom or Bust // Booneville // Bootleg Boogie // Bootlegger(GA) // Born to Run // Boundiful // Brazos Bend // Bromont Ultra // Bryce Canyon // Buckeye // Burney Mountain // Burning River // BURT // C&O Canal // Cactus Rose // Cahuilla Rez // Camp Croft // Canal Corridor // Canebreak // Canyons // Cascade Crest // Centurion // Chattabrewchee // Chesterfield Gorge // Chief Ladiga // CMAR // Coldwater Rumble // Cool Moon // Copper Kings // Coyote 2 Moon // Crazy Mountain // Creede // Crooked Creek // Crown Stub // Crown of the Crest // Cruel Jewel // Cry Me A River! // Dark Divide // Daytona // Deadman Peaks // Desert Solstice // Devil Dog // Devil's Gulch // Dinosaur Valley // Double Top // The Drift // Eagle Up // East Fork // Eastern States // El Diablo // Enoree // Export // Fall Creek // Farmdale Trail // Fat Ox // Feral Mtn. // Festivus // Fire Fest Ultra // Flat Top Mesa // Folsom // Forbidden Forest // Forgotten Florida // Froggy Mountain // Frozen: H3 // FSR // Gaspesia // Georgia Jewel // Ghost Train // Gila // Girl Scout Island // Goat Rattler // Grandmaster // Grasslands // Great Divide // Grindstone // Habanero Hundred // Hainesport Hundred // Haliburton // Hardrock // Hare Mountain // Hawk Hundred // Heartland // Hell Creek // Hell Hole Hundred // Hellbender // Hennepin Hundred // Herzog // High Lea // High Lonesome // HighFive // Hindsight // Hitchcock // HKY // Holly Springs // Honey Badger // Huron // HURT // IMTUF // Indiana Trail // Infinitus // Iron Horse Ultra(CAN) // Iron Heart // Iron Will // Island View // Jackpot // Javelina Jundred // Jigger Johnson // Kettle Moraine // KEYS100 // KingWood // Kodiak // Lake Murray // Lake Sonoma // Lake Vian Hilltop // Last Chance // Leadville // Lean Horse // Leatherwood // Leona Divide // Long Haul // Lost Soul // Loopy Looper // Loup Garou // LOViT // Maah Daah Hey // Mace's Hideout // Machete Trail Madness // Mamba // Marji Gesick // Massanutten // Massanutten's Revenge // Metahqua // Miami // Midstate Massive // Midwest Everest // Midwest States // Mighty Mosquito // Mile Madness // Mines of Spain // Mississippi // Mogollon Monster // Mohican // Mountain Lakes // Mountaineer Rumble // MST // Nanny Goat // New Year's One Day // Next Loop // No Business // Notchview // Ocean State // Octopus // Oil Creek // Old Dominion // Orcas Island // Oregon Cascades // Ouray // Outlaw // Ozark // Ozark Foothills // Pigtails Challenge // Pine Creek // Pinhoti // The Pistol Ultra // Plain // Ponderosa Polar Challenge // Pony Express // Porkies // Potawatomi // Prairie Spirit // Pulse // Pumpkin Holler // Rabid Raccoon // Rails-to-Trails // Resurrection Pass // Rim to River // Rim Runner // Rio del Lago // Rio Grande // Riverlands // Rocky Raccoon // Run of the Century // Run Rabbit Run // Run Undead // Run Woodstock // Saddles // Salt Flats // San Diego // San Juan Softie // Sangre de Cristo // Scout Mountain // Screaming Monkey // Shawnee Hills // Shippey // Show me Your Free State // Silver Moon // Silverheels // Sinister 7 // SISU PNW // Skunk Ape // SOO // Southern States // Southern Tour // Space Pirate // Spirit of Syllamo // Stagecoach // Standhope // Strawberry Fields Forever // Stuffed Turkey // Sulphur Springs // Superior // Susitna // Tahoe Rim Trail // Tally in the Valley // Tampa Bay // tBunk // Teanaway Country // Tesla Hertz // TGNY // Thunder Kiss // Tunnel Hill // Tuscazoar // Tussey mOUnTaiNBACK // Ultra Fest // Ultra Trail Forillon // Ultrapalooza // Umstead // Underground Circus // Urban Adventure // Ute // UTFS // Uwharrie // Vermont // Viaduct Trail // Viper // Virgil Crest // Virginia Trail // Warbird // Wasatch Front // Washington Yeti // Western States // White Mountains // Wild Goose // Wildcat // Willapa // Wolverine State // Woodbooger // Woodstock Warrior // Wyoming Range // Yeti // Zion // Zumbro
Google spreadsheet of 100⁺ milers
Calendars/schedules
No. Calif. ultras (< 100 miles) // So. Calif. ultras // UltraRaceCalendar // Northwest ultras // Florida ultras // Idaho ultras // UK Ultras // Other ultras (over 1,100 events, 28.4 to 3100 miles)
Ultra Slams & Series
The Grand Slam of Ultrarunning™ // Midwest Grand Slam of Ultrarunning // Washington Grand Slam // The Last Great Race // The Great Eight // Western Slam // Eastern Slam // LarrySlam // Rail Trail Slam // Rocky Mt. Slam // Californa Slam // Kansas Grand Slam // San Diego Ultra Slam // All Amer. Mtn. Slam // Super Slam // HRQ Super Slam // Grand Kona Slam // Alaska Slam // Arctic Slam // Extreme Triple Crown // Grand Slam of the World // Swedish 100 Miles Challenge // 5 Continents Grand Slam // 50K Mashup // O.U.S. Slam // Pinhoti Slam // Grand Slam of 200s // Triple Crown of 200s // Bartley Double // NorCal 100K Grand Slam // The Beast Series // Tejas Trails 300 // Tejas Hell // Gnarly Bandit // Montrail Ultra Cup // TrailRunner Trophy Series // NoCal Ultra Grand Prix // SoCal Ultra Grand Prix // Oregon Trail Ultras // Canadian Ultras // Western New York Ultras // UMTR Ultra Series
Clubs
BAUR // Buffalo Chips // Club Fat Ass // Coastside Running Club // Dallas Dirt Runners (D.D.R.) // Flatlander Ultrarunners // Folsom Trail Runners // GAC (Gil's Athletic Club) // GOATz (Greater Omaha Area Trailrunnerz) // GUTS (Georgia Ultrarunning & Trailrunning Society) // HURT // iRunFar's list // Palo Alto Run Club // Quicksilver Running Club // Silver State Striders // Stevens Creek Striders // SLUGs (St. Louis Ultrarunners Group) // SURF // Tamalpa // TATUR // Terrain Trail Runners(STL) // Trail Animals Running Club(TARC) // Trail Running Adventures // Ultraladies // UltraRunning Matters // VHTRC
Photos, including albums for:
Angeles Crest // Avalon 50m // The Bear // Cascade Crest // Catalina 100k // Coyote 4 Play // Devil's Backbone // Hardrock // H.U.R.T. // Javelina Jundred // Leadville // Lean Horse // Massanutten Mtn. // Old Dominion // Quad Dipsea // Rio del Lago // Rocky Raccoon // Umstead // Vermont // Wasatch Front // Western States // Zane Grey
Miscellaneous
Books // Videos // Foreign ultras (in German) // Free advice // Running-related quotes // Milestones (mega-ultrarunners in the USA) // (other mega-ultrarunners) // Ultrarunner packing
Other Internet Resources
Subscribing to the ULTRA List // Joining the Yahoo! group // Goodies (buckles, T-shirts, etc.) // What's an Ultra Marathon? (and how can I finish one?)

Blogs, Forums & Podcasts
iRunFar.com Trail/Ultra Resource (my interview & 30th anniversary)
Trail Runner Nation podcasts & other resources (my interview)
Talk Ultra All about running. By runners, for runners.
A Trail Runner's Blog (by Scott Dunlap)
Running, my second job and passion... (by Jean Pommier)
Ten Junk Miles A lighthearted conversation by trail, road, and ultra runners
DFL Ultrarunning (by Eric & friends)
"Going the Distance!" Blog (by Carey Smith)
Science of Ultra (by Shawn Bearden)
EnduranceBuzz Trail/Ultra Resource in the South/Midwest US
TURD Podcast Trail Ultrarunning Race Directors Podcast
Dirty Inspirations (by Terri Schneider)
130 Running Blogs! (by Andreas)
Pain Cave (by Jay Friedman)
Multiday Running Blog
Mister Tristan (by Gary Bruner)
Ultrafinishers (by Scott Johnson)
Undefeated Running (by Adam Gothelf)
Your First Ultra (by David Tosch)
100 mile podcast on-going audio series
Dr. Mel Newton ultra- running/riding vet
Podcast Directory from the ATRA
Sites/blogs by other ultrarunners
Coaching & Camps
Andy & Kim Holak's trail running adventures
Anil Rao's "Coaching for Ultras"
Bad to the Bone: trail runs & training/coaching
Bree Lambert's site: Live Well; Finish Strong
Danny Dreyer's site ChiRunning Coach
Don Reichelt's site: Boundless Endurance
Donnie & Tom's site Flahavan Ultra Coaching
Garett Graubins' site: Endurance Coaching
Geoff Vaughan's site: Northside Coaching
Karl Meltzer's coaching & ultra blog
Lisa Smith-Batchen's site coaching, events & running camps
Michael Garrison's coaching site
Michele Hartwig's coaching site: Ornery Mule Racings
Nomadic Experience Simon Mtuy's climbs, safaris, eco-adventures, etc.
Paul DeWitt's site: Train Smarter, Not Harder©
Scott Jurek's site training & trail running
Sharman Ultra Ian Sharman and Ellie Greenwood
Susan Donnelly's Don't Go Home Without a Buckle
Terri Schneider coaching, clinics & sport psychology
Tim Neckar's site personal running coach
Tommy Nielsen Coaching personal on-line coach
Tracy Garneau's coaching: Garneau Endurance
Other Links
Kevin Sayers' Site The How-To of Ultrarunning
UltraRunning Magazine News, Races, etc.
UltraSignUp Race registration and stats
UltraLive Race tracking and stats
UltraSplits Splits, pacing & lottery odds
Zombie Runner ultra gear & supplies
San Francisco Running Company THE Marin Connection
Healdsburg Running Company Lake Sonoma and so much more
Victory Sportdesign ultra dropbags
Nick Marshall's Ultra longevity stats
Ultra Sports Science Foundation: ultra-endurance science & medicine
Epic Ultras great ultras in Kansas
Joe TrailMan gaiters
Michigan Bluff Photography
Sage to Summit: fastpacking site
UltraFanatics: track your ultra results
DUV: ultramarathon statistics
ULTRA Magazine UK's new magazine
Trail Runner Magazine the gospel of trail running
ULTRAmarathonRunning Trail, mountain, desert events, etc.
Ultrarunning: just what is an ultra?
USA Ultrarunning 100k & 24hr teams
International Trail Running Assn. trail running org.
International 100+ UltraRunning Foundation connecting ultrarunners
International ultras calendar / Multi-day ultras
Arkansas Ultra Running Assn (AURA) AT100+
AUA news and info on USA ultrarunning
Planet Ultramarathon news on ultrarunning
SUCCEED! products (electrolytes, etc.)
Robert Tavernini's awards for ultras

"http://www.Run100s.com/" (updated: 6/23/26) StanJ@Run100s.com (over a gazillion hits since 5/15/95)