2015 - 2016 USA Ultramarathon Calendar in May

Browse our Ultramarathon Calendar for races organized in USA during the month of May among 148 races.

148 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