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2014 - 2015 USA Ultramarathon Calendar in May

Browse our Ultramarathon Calendar for races organized in USA during the month of May among 125 races.

125 races

Collegiate Peaks 50M Trail Run

  • North America | USA | Mountain Region | Colorado | Buena Vista
  • Ultramarathon - 50 miles
  • May 02, 2015
  • Trail

Greenland Trail 50k

  • North America | USA | Mountain Region | Colorado | Greenland
  • Ultramarathon - 50 kilometers
  • May 02, 2015 - 08:00
  • Trail

Labor of Love 100M

  • North America | USA | Mountain Region | Nevada | Lowell Canyon
  • Ultramarathon - 100 miles
  • May 02, 2015
  • Road Running Calico Racing

Labor of Love 50K

  • North America | USA | Mountain Region | Nevada | Lowell Canyon
  • Ultramarathon - 50 kilometers
  • May 02, 2015 - 06:00
  • Calico Racing

Labor of Love 50M

  • North America | USA | Mountain Region | Nevada | Lowell Canyon
  • Ultramarathon - 50 miles
  • May 02, 2015
  • Road Running Calico Racing

Miwok 100K Trail Race

  • North America | USA | Pacific | California | Rodeo Lagoon
  • Ultramarathon - 100 kilometers
  • May 02, 2015 - 05:40
  • UTMB Qualifier Trail Western States Qualifier

OBX Ultramarathon

  • North America | USA | South Atlantic | North Carolina | Corolla
  • Ultramarathon - 50 kilometers
  • May 02, 2015 - 05:00
  • Flat Fun Green Barefoot Trail North Carolina Ultra Series Sand

Rock The Ridge 50-Mile Endurance Challenge

  • North America | USA | Mid-Atlantic | New York | New Palz
  • Ultramarathon - 50 miles
  • May 02, 2015
  • Walk Charity Trail Relay

The North Face Endurance Challenge New York 50k

  • North America | USA | Mid-Atlantic | New York | Bear Mountain
  • Ultramarathon - 50 kilometers
  • May 02, 2015 - 07:00
  • Trail Hilly

The North Face Endurance Challenge New York 50 Mile

  • North America | USA | Mid-Atlantic | New York | Bear Mountain
  • Ultramarathon - 50 miles
  • May 02, 2015 - 05:00
  • Trail Hilly

Wild Wild West 50K Ultra

  • North America | USA | Pacific | California | Lone Pine
  • Ultramarathon - 50 kilometers
  • May 02, 2015 - 06:00
  • Trail Mountain

Ragnar Relay Cape Cod

  • North America | USA | New England | Massachusetts | Plymouth
  • Ultramarathon - 186 miles
  • May 08, 2015
  • Road Running Ragnar Relay Series Relay

Cinderella Trail Run 50 km (May)

  • North America | USA | Pacific | California | Joaquin Miller Park, Oakland
  • Ultramarathon - 50 kilometers
  • May 09, 2015 - 08:00
  • Trail

Ice Age Trail 50K

  • North America | USA | East North Central | Wisconsin | La grange
  • Ultramarathon - 50 kilometers
  • May 09, 2015 - 06:00
  • Trail

Ice Age Trail 50M

  • North America | USA | East North Central | Wisconsin | La grange
  • Ultramarathon - 50 miles
  • May 09, 2015 - 06:00
  • UTMB Qualifier Trail