2014 - 2015 USA Ultramarathon Calendar in May

Browse our Ultramarathon Calendar for races organized in USA during the month of May among 129 races.

129 races

Collegiate Peaks 50M Trail Run

  • North America | USA | Mountain Region | Colorado | 9565
  • Ultramarathon - 50 miles
  • May 02, 2015
  • Trail

Greenland Trail 50k

  • North America | USA | Mountain Region | Colorado | 2430
  • Ultramarathon - 50 kilometers
  • May 02, 2015 - 08:00
  • Trail

Labor of Love 100M

  • North America | USA | Mountain Region | Nevada | 12526
  • Ultramarathon - 100 miles
  • May 02, 2015
  • "Road Running" "Calico Racing"

Labor of Love 50K

  • North America | USA | Mountain Region | Nevada | 4342
  • Ultramarathon - 50 kilometers
  • May 02, 2015 - 06:00
  • "Calico Racing"

Labor of Love 50M

  • North America | USA | Mountain Region | Nevada | 12527
  • Ultramarathon - 50 miles
  • May 02, 2015
  • "Road Running" "Calico Racing"

Miwok 100K Trail Race

  • North America | USA | Pacific | California | 2693
  • Ultramarathon - 100 kilometers
  • May 02, 2015 - 05:40
  • "UTMB Qualifier" Trail "Western States Qualifier"

OBX Ultramarathon

  • North America | USA | South Atlantic | North Carolina | 12595
  • 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 | 17768
  • Ultramarathon - 50 miles
  • May 02, 2015
  • Walk Charity Trail Relay

Run for Kids Challenge 50K Trail Race

  • North America | USA | East South Central | Alabama | 15755
  • Ultramarathon - 50 kilometers
  • May 02, 2015 - 07:00
  • Trail

Sinister Night 54K Trail Run

  • North America | USA | Mountain Region | Arizona | 18989
  • Ultramarathon - 54 kilometers
  • May 02, 2015 - 19:00
  • Night Trail "Aravaipa Running"

The North Face Endurance Challenge New York 50k

  • North America | USA | Mid-Atlantic | New York | 2636
  • Ultramarathon - 50 kilometers
  • May 02, 2015 - 07:00
  • Hilly Trail

The North Face Endurance Challenge New York 50 Mile

  • North America | USA | Mid-Atlantic | New York | 2635
  • Ultramarathon - 50 miles
  • May 02, 2015 - 05:00
  • Hilly Trail

Wild Wild West 50K Ultra

  • North America | USA | Pacific | California | 3868
  • Ultramarathon - 50 kilometers
  • May 02, 2015 - 06:00
  • Trail Mountain

Badwater Salton Sea

  • North America | USA | Pacific | California | 16160
  • Ultramarathon - 81 miles
  • May 03, 2015
  • Desert Team Trail Mountain

PEAK Ultra Marathon - 500 Miles

  • North America | USA | New England | Vermont | 11198
  • Ultramarathon - 500 miles
  • May 07, 2015 - 16:00
  • Trail