2014 - 2015 North America Ultramarathon Calendar in May

Browse our Ultramarathon Calendar for races organized in North America during the month of May among 140 races.

140 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
  • Hilly Trail

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
  • Hilly Trail

Wild Wild West 50K Ultra

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

PEAK Ultra Marathon - 500 Miles

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

Ragnar Relay Cape Cod

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

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