2015 - 2016 North America Ultramarathon Calendar in May

Browse our Ultramarathon Calendar for races organized in North America during the month of May among 165 races.

165 races

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Adrenaline Night Run

Adrenaline 65K Night Run
  • May 30, 2015 - 19:00
  • North America | USA | Mountain Region | Arizona | McDowell Mountain Regional Park, Fountain Hills
  • Ultramarathon - 65 kilometers
  • Night Trail Aravaipa Running

Blackfoot Ultra

Blackfoot Ultra 100KM
  • May 30, 2015 - 05:00
  • North America | Canada | Alberta | Edmonton
  • Ultramarathon - 100 kilometers

Blackfoot Ultra

Blackfoot Ultra 50 Km
  • May 30, 2015 - 09:00
  • North America | Canada | Alberta | Edmonton
  • Ultramarathon - 50 kilometers
  • Trail

Blackfoot Ultra

Blackfoot Ultra 50 Miler
  • May 30, 2015 - 06:30
  • North America | Canada | Alberta | Edmonton
  • Ultramarathon - 50 miles
  • Trail

Coyote Scramble Ultras

Coyote Scramble Ultras 30 Miler
  • May 30, 2015 - 06:00
  • North America | USA | New England | Vermont | Kingdom Trails, East Burke
  • Ultramarathon - 30 miles
  • Trail

Coyote Scramble Ultras

Coyote Scramble Ultras 40 Miler
  • May 30, 2015 - 06:00
  • North America | USA | New England | Vermont | Kingdom Trails, East Burke
  • Ultramarathon - 40 miles
  • Trail

Flint Hills Trail 40 Mile & Marathon

Flint Hills Trail 40 Mile
  • May 30, 2015 - 06:00 Inaugural race
  • North America | USA | West North Central | Kansas | Ottawa
  • Ultramarathon - 40 miles
  • Trail

The Loco Go Big or Go Home Challenge

Loco 50K
  • May 30, 2015 - 07:00
  • North America | USA | Pacific | California | Butte Meadows
  • Ultramarathon - 50 kilometers

Loco Half Marathon

Loco 50K
  • May 30, 2015 - 07:00
  • North America | USA | Pacific | California | Chico
  • Ultramarathon - 50 kilometers

Mayapple Trail Runs

Mayapple 100K Trail Run
  • May 30, 2015
  • North America | USA | Mid-Atlantic | New Jersey | Milburn
  • Ultramarathon - 100 kilometers
  • Trail

Mayapple Trail Runs

Mayapple 50k Trail Run
  • May 30, 2015
  • North America | USA | Mid-Atlantic | New Jersey | Milburn
  • Ultramarathon - 50 kilometers
  • Trail

Mohican Trail

Mohican Trail 100M Trail Run
  • May 30, 2015 - 05:00
  • North America | USA | East North Central | Ohio | Loudonville
  • Ultramarathon - 100 miles
  • UTMB Qualifier Trail Midwest Grand Slam of Ultrarunning Western States Qualifier

Mohican Trail

Mohican Trail 50M Trail Run
  • May 30, 2015 - 05:00
  • North America | USA | East North Central | Ohio | Loudonville
  • Ultramarathon - 50 miles
  • Trail Midwest Grand Slam of Ultrarunning

Rockin Choccolocco

Rockin Choccolocco 50K
  • May 30, 2015 - 07:30
  • North America | USA | East South Central | Alabama | Heflin
  • Ultramarathon - 50 kilometers
  • Hilly Trail Pinhoti Trail Series

San Francisco 50 & 100 Mile Endurance Runs

San Francisco 100 Mile Endurance Run
  • May 30, 2015 - 07:00
  • North America | USA | Pacific | California | Rodeo Beach, Golden Gate National Recreation, CA
  • Ultramarathon - 100 miles
  • Hilly Trail Coastal Trail Runs
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