2014 - 2015 USA Ultramarathon Calendar in May

Browse our Ultramarathon Calendar for races organized in USA during the month of May among 121 races.

121 races

  • Armstrong Redwoods 50K

    • North America | USA | California | Guerneville
    • Ultramarathon - 50 kilometers
    • May 03, 2014 - 08:30
    • Trail Hilly
  • Canyons 50K Trail Run

    • North America | USA | California | Foresthill
    • Ultramarathon - 50 kilometers
    • May 03, 2014 - 07:30
    • Trail Mountain
  • Collegiate Peaks 50M Trail Run

    • North America | USA | Mountain Region | Colorado | Buena Vista
    • Ultramarathon - 50 miles
    • May 03, 2014
    • Trail
  • Grand Ridge 50K Trail Run (May)

    • North America | USA | Pacific | Washington | Issaquah
    • Ultramarathon - 50 kilometers
    • May 03, 2014
    • Trail
  • Greenland Trail 50k

    • North America | USA | Mountain Region | Colorado | Greenland
    • Ultramarathon - 50 kilometers
    • May 03, 2014 - 08:00
    • Trail
  • Labor of Love 100M

    • North America | USA | Mountain Region | Nevada | Lowell Canyon
    • Ultramarathon - 100 miles
    • May 03, 2014
    • Road Running
  • Labor of Love 50K

    • North America | USA | Mountain Region | Nevada | Lowell Canyon
    • Ultramarathon - 50 kilometers
    • May 03, 2014 - 06:00
  • Labor of Love 50M

    • North America | USA | Mountain Region | Nevada | Lowell Canyon
    • Ultramarathon - 50 miles
    • May 03, 2014
    • Road Running
  • Me-Ow Quads

    • North America | USA | California | Whiskeytown
    • Ultramarathon - 104.8 miles
    • May 03, 2014
    • Trail Charity Mountain
  • Me-Ow Siamese

    • North America | USA | California | Whiskeytown
    • Ultramarathon - 42.4 miles
    • May 03, 2014 - 06:00
    • Trail Charity Mountain
  • Miwok 100K Trail Race

    • North America | USA | Pacific | California | Rodeo Lagoon
    • Ultramarathon - 100 kilometers
    • May 03, 2014 - 05:40
    • Trail
  • Nirvana Ultra Big Bear 100K

    • North America | USA | California | San Bernardino National Forest
    • Ultramarathon - 100 kilometers
    • May 03, 2014 - 06:00
    • Trail Mountain
  • Nirvana Ultra Big Bear 100 Mile

    • North America | USA | California | San Bernardino National Forest
    • Ultramarathon - 100 miles
    • May 03, 2014 - 06:00
    • Trail Mountain
  • Nirvana Ultra Big Bear 50K

    • North America | USA | California | San Bernardino National Forest
    • Ultramarathon - 50 kilometers
    • May 03, 2014 - 06:00
    • Trail Mountain
  • Nirvana Ultra Big Bear 50 Mile

    • North America | USA | California | San Bernardino National Forest
    • Ultramarathon - 50 miles
    • May 03, 2014 - 06:00
    • Trail Mountain