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

Webberville Memorial Day Run

10k Run
  • May 25, 2015 - 09:00
  • North America | USA | East North Central | Michigan | Webberville
  • Ultramarathon - 62 miles

TrailFactor 50k

  • May 25, 2015 - 08:00
  • North America | USA | Pacific | Oregon | Forest Park, Portland
  • Ultramarathon - 50 kilometers
  • Trail

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

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

San Francisco 50 & 100 Mile Endurance Runs

San Francisco 50 Mile Endurance Run
  • May 30, 2015 - 07:00
  • North America | USA | Pacific | California | Rodeo Beach, Golden Gate National Recreation, CA
  • Ultramarathon - 50 miles
  • Hilly Trail Coastal Trail Runs