2015 - 2016 North America Ultramarathon Calendar in May

Browse our Ultramarathon Calendar for races organized in North America during the month of May among 164 races.

164 races

Armstrong Redwoods

Armstrong Redwoods 50K

  • May 02, 2015 - 08:30
  • North America | USA | California | Guerneville
  • Ultramarathon - 50 kilometers
  • Hilly Trail

Biffledinked 10 x 5k

  • May 02, 2015 - 08:00
  • North America | USA | Virginia | Virginia Beach
  • Ultramarathon - 50 kilometers
  • Flat Road Running

Biffledinked 10 x 5k

Biffledinked 10 x 5k 2 Person Relay

  • May 02, 2015 - 08:00
  • North America | USA | Virginia | Virginia Beach
  • Ultramarathon - 50 kilometers
  • Flat Road Running

Big A 50K Trail Run

  • May 02, 2015 - 07:30
  • North America | USA | Maine | York
  • Ultramarathon - 50 kilometers
  • Charity Trail

Cactus to Cloud Trail Run

Cactus to Cloud Trail 50K Run

  • May 02, 2015 Inaugural race
  • North America | USA | New Mexico | Cloudcroft
  • Ultramarathon - 50 kilometers
  • Trail

Canyons 50K Trail Run

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

Collegiate Peaks Trail Run

Collegiate Peaks 50M Trail Run

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

Falcon 50

  • May 02, 2015 - 06:00
  • North America | USA | Colorado | Colorado Springs
  • Ultramarathon - 50 miles
  • Charity

Grand Ridge Trail Run (May)

Grand Ridge 50K Trail Run (May)

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

Greenland Trail 50k

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

Heartland 50 Mile Spring Race

  • May 02, 2015
  • North America | USA | Kansas | Cassoday
  • Ultramarathon - 50 miles

Labor of Love 100M, 50M, 50K, Marathon, Half Marathon & 10K

Labor of Love 100M

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

Labor of Love 100M, 50M, 50K, Marathon, Half Marathon & 10K

Labor of Love 50K

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

Labor of Love 100M, 50M, 50K, Marathon, Half Marathon & 10K

Labor of Love 50M

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

Me-Ow

Me-Ow Quads

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