US Ultramarathons

Browse our Ultramarathon Calendar for races organized in the USA.

1,078 races

GrindStone 100

  • North America | USA | South Atlantic | Virginia | Swoope
  • Ultramarathon - 101.85 miles
  • October 03, 2014 - 18:00
  • Trail Eco-x Sports Western States Qualifier

Ragnar Relay Washington D.C.

  • North America | USA | South Atlantic | Maryland | Cumberland
  • Ultramarathon - 200 miles
  • October 03, 2014
  • Relay Ragnar Relay Series

Arkansas Traveller 100

  • North America | USA | West South Central | Arkansas | Camp Ouachita
  • Ultramarathon - 100 miles
  • October 04, 2014
  • Trail Western States Qualifier

Baker Lake 50k

  • North America | USA | Pacific | Washington | Baker Lake
  • Ultramarathon - 50 kilometers
  • October 04, 2014 - 08:00
  • Trail

Cloudsplitter 100K

  • North America | USA | Kentucky | Pine Mountain
  • Ultramarathon - 100 kilometers
  • October 04, 2014

Cloudsplitter 100 Mile

  • North America | USA | Kentucky | Pine Mountain
  • Ultramarathon - 100 miles
  • October 04, 2014

Cloudsplitter 50K

  • North America | USA | Kentucky | Pine Mountain
  • Ultramarathon - 50 kilometers
  • October 04, 2014

Cuyamaca 100K Endurance Run

  • North America | USA | Pacific | California | Cuyamaca Rancho State Park
  • Ultramarathon - 100 kilometers
  • October 04, 2014 - 06:30
  • UTMB Qualifier Trail Western States Qualifier

Flagstaff 56K Endurance Run

  • North America | USA | Mountain Region | Arizona | Coconino National Forest, Flagstaff
  • Ultramarathon - 56 kilometers
  • October 04, 2014 - 07:00
  • Trail Aravaipa Running Mountain

Foothills 50K Frenzy

  • North America | USA | Idaho | Fort Boise
  • Ultramarathon - 50 kilometers
  • October 04, 2014 - 06:00
  • Trail

Hunter Gatherer 50K

  • North America | USA | West South Central | Texas | Rocksprings
  • Ultramarathon - 50 kilometers
  • October 04, 2014 - 04:00
  • Hilly Desert Obstacle race Trail Extreme

Lake Perry Rocks! 50K

  • North America | USA | West North Central | Kansas | Meriden
  • Ultramarathon - 50 kilometers
  • October 04, 2014 - 08:00
  • Hilly Trail

Rock/Creek StumpJump 50K Ultra

  • North America | USA | East South Central | Tennessee | Chattanooga
  • Ultramarathon - 50 kilometers
  • October 04, 2014
  • Trail

Survival Run: Hunter Gatherer

  • North America | USA | West South Central | Texas | Rocksprings
  • Ultramarathon - 50 kilometers
  • October 04, 2014 - 04:00
  • Hilly Desert Mud Obstacle race Trail Extreme

Swamp Rabbit Urban Ultra 50K

  • North America | USA | South Carolina | Greenville
  • Ultramarathon - 50 kilometers
  • October 04, 2014 - 07:30