2015 - 2016 North America Ultramarathon Calendar in May

Browse our Ultramarathon Calendar for races organized in North America during the month of May among 157 races.

157 races

  • 1
  • 11

Greenland Trail 50k

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

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

Capon Valley 50K Run

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

Miwok 100K Trail Race

  • 2016-05-07
  • USA | California | Rodeo Lagoon
  • Ultramarathon - 100 kilometers
  • UTMB Qualifier Trail Western States Qualifier

Singletrack Maniac 50k Trail Run

  • 2016-05-07
  • USA | Virginia | Williamsburg
  • Ultramarathon - 50 kilometers
  • Trail

Wild Wild West Marathon

Wild Wild West 50K Ultra
  • 2016-05-07
  • USA | California | Lone Pine
  • Ultramarathon - 50 kilometers
  • Trail Mountain

Born to Run Ultra Marathons

200 Miler
  • 2016-05-12
  • USA | California | Los Olivos
  • Ultramarathon - 200 miles
  • Trail All we do is run

PEAK Ultra Marathon

30 Miles
  • 2016-05-12
  • USA | Vermont | Pittsfield
  • Ultramarathon - 30 miles
  • Trail

3 Days at the Fair

3 Days at the Fair - 50K
  • 2016-05-12
  • USA | New Jersey | Sussex County Fairgrounds
  • Ultramarathon - 50 kilometers
  • NJ Trail Series

Born to Run Ultra Marathons

100 Miler
  • 2016-05-13
  • USA | California | Los Olivos
  • Ultramarathon - 100 miles
  • Trail All we do is run

Ragnar Relay Cape Cod

  • 2016-05-13
  • USA | Massachusetts | Plymouth
  • Ultramarathon - 186 miles
  • Road Running Relay Ragnar Relay Series

Born to Run Ultra Marathons

30 Miler
  • 2016-05-14
  • USA | California | Los Olivos
  • Ultramarathon - 30 miles
  • Trail All we do is run
  • 1
  • 11