2014 - 2015 USA Ultramarathon Calendar in May

Browse our Ultramarathon Calendar for races organized in USA during the month of May among 133 races.

133 races

Canyons 50K Trail Run

  • North America | USA | California | Foresthill
  • Ultramarathon - 50 kilometers
  • May 02, 2015 - 07:30
  • Trail Mountain

Collegiate Peaks 50M Trail Run

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

Grand Ridge 50K Trail Run (May)

  • North America | USA | Pacific | Washington | Issaquah
  • Ultramarathon - 50 kilometers
  • May 02, 2015
  • Trail "Evergreen Trail Runs"

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"

Me-Ow Quads

  • North America | USA | California | Whiskeytown
  • Ultramarathon - 104.8 miles
  • May 02, 2015
  • Charity Trail "Shasta Trail Runs" Mountain

Me-Ow Siamese

  • North America | USA | California | Whiskeytown
  • Ultramarathon - 42.4 miles
  • May 02, 2015 - 06:00
  • Charity Trail "Shasta Trail Runs" Mountain

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"

Nirvana Ultra Big Bear 100K

  • North America | USA | California | San Bernardino National Forest
  • Ultramarathon - 100 kilometers
  • May 02, 2015 - 06:00
  • Trail "Nirvana Racing Co. Ultra Marathons" Mountain

Nirvana Ultra Big Bear 100 Mile

  • North America | USA | California | San Bernardino National Forest
  • Ultramarathon - 100 miles
  • May 02, 2015 - 06:00
  • Trail "Nirvana Racing Co. Ultra Marathons" Mountain

Nirvana Ultra Big Bear 50K

  • North America | USA | California | San Bernardino National Forest
  • Ultramarathon - 50 kilometers
  • May 02, 2015 - 06:00
  • Trail "Nirvana Racing Co. Ultra Marathons" Mountain

Nirvana Ultra Big Bear 50 Mile

  • North America | USA | California | San Bernardino National Forest
  • Ultramarathon - 50 miles
  • May 02, 2015 - 06:00
  • Trail "Nirvana Racing Co. Ultra Marathons" Mountain

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