2016 - 2017 USA Ultramarathon Calendar in May

Browse our Ultramarathon Calendar for races organized in USA during the month of May among 130 races.

130 races

Greenland Trail 50k

Greenland Trail 50k
  • 2016-05-01
  • USA | Colorado | Greenland
  • Ultramarathon - 50 kilometers
  • Trail

Leoni Meadows Race Series - 50k, Half Marathon, 5k, Kids Fun Run

Leoni Meadows 50k
  • 2016-05-01
  • USA | California | Grizz
  • Ultramarathon - 50 kilometers
  • Hilly Fun Trail

Palm Bluff Trail Race and Ultra "Margaritas & Manure"

Palm Bluff Trail Race and Ultra "Margaritas & Manure" 50K
  • 2016-05-01
  • USA | Florida | Osteen
  • Ultramarathon - 50 kilometers
  • Trail

Palm Bluff Trail Race and Ultra "Margaritas & Manure"

Palm Bluff Trail Race and Ultra "Margaritas & Manure" 50M
  • 2016-05-01
  • USA | Florida | Osteen
  • Ultramarathon - 50 miles
  • Trail

Canyons 50K Trail Run

100K
  • 2016-05-07
  • USA | California | Foresthill
  • Ultramarathon - 100 kilometers
  • Trail Mountain

Nirvana Ultra Big Bear

100 Miler
  • 2016-05-07
  • USA | California | San Bernardino National Forest
  • Ultramarathon - 100 miles
  • Trail Nirvana Racing Co. Ultra Marathons Mountain

Canyons 50K Trail Run

50K
  • 2016-05-07
  • USA | California | Foresthill
  • Ultramarathon - 50 kilometers
  • Trail Mountain

Smith Rock Ascent 50K, 15M, 4M

50K
  • 2016-05-07
  • USA | Oregon | Smith Rock State Park, Terrebonne
  • Ultramarathon - 50 kilometers
  • UTMB Qualifier Trail Northwest Mountain Trail Series Mountain

Nirvana Ultra Big Bear

50 Miler
  • 2016-05-07
  • USA | California | San Bernardino National Forest
  • Ultramarathon - 50 miles
  • Trail Nirvana Racing Co. Ultra Marathons Mountain

All Day 5K

  • 2016-05-07
  • USA | Arizona | Chino Valley
  • Ultramarathon - 50 kilometers

Armstrong Redwoods

Armstrong Redwoods 50K
  • 2016-05-07
  • USA | California | Guerneville
  • Ultramarathon - 50 kilometers
  • Hilly Trail

Cactus to Cloud Trail Run

  • 2016-05-07
  • USA | New Mexico | Cloudcroft
  • Ultramarathon - 50 kilometers
  • Trail

Capon Valley 50K Run

  • 2016-05-07
  • USA | West Virginia | Yellow Spring
  • Ultramarathon - 50 kilometers
  • Hilly Trail Fund raising

Collegiate Peaks Trail Run

Collegiate Peaks 50M Trail Run
  • 2016-05-07
  • USA | Colorado | Buena Vista
  • Ultramarathon - 50 miles
  • Trail

Falcon 50

Falcon 50
  • 2016-05-07
  • USA | Colorado | Colorado Springs
  • Ultramarathon - 50 miles
  • Charity