2014 - 2015 North America Ultramarathon Calendar in May

Browse our Ultramarathon Calendar for races organized in North America during the month of May among 144 races.

144 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