2016 - 2017 USA Ultramarathon Calendar in May

Browse our Ultramarathon Calendar for races organized in USA during the month of May among 129 races.

129 races

Greenland Trail 50k

Greenland Trail 50k
2017-05-06
USA / Mountain Region / Colorado / Larkspur
Ultramarathon - 50 kilometers
Trail Fast

5K for FA

Kids Fun Run
2017-05-06
USA / Mid-Atlantic / New York / Hilton
Ultramarathon - 1000 kilometers

Keys 100

Keys 100 Mile
2017-05-20
USA / South Atlantic / Florida / Key Largo
Ultramarathon - 100 miles
Charity Relay

Keys 100

Keys 50K Race
2017-05-20
USA / South Atlantic / Florida / Key Largo
Ultramarathon - 50 kilometers
Relay

Keys 100

Keys 50 Mile Race
2017-05-20
USA / South Atlantic / Florida / Key Largo
Ultramarathon - 50 miles

Chippewa Moraine 'A Run for the AGES'

Chippewa 50K Trail Run
2017-05-27
USA / East North Central / Wisconsin / New Auburn
Ultramarathon - 50 kilometers
Trail

Run Madtown

Conquer the Capital 45.5 Challenge
2017-05-27
USA / East North Central / Wisconsin / Madison
Ultramarathon - 45.500 miles

Santa Barbara Trail Run

Santa Barbara 50K Trail Run
2014-05-31
USA / Pacific / California / Santa Barbara
Ultramarathon - 50 kilometers
Trail

OBX Ultramarathon

2015-05-02
USA / South Atlantic / North Carolina / Corolla
Ultramarathon - 50 kilometers
Flat Fun Green Trail North Carolina Ultra Series Sand Barefoot

Badwater Salton Sea

2015-05-03
USA / Pacific / California / Salton City
Ultramarathon - 81 miles
Desert Team Trail Mountain

Cimarron 50k Endurance Run

2015-05-03
USA / Mountain Region / Colorado / Cimarron
Ultramarathon - 50 kilometers
Road Running Ever Run Racing

50's For Yo Momma

50's For Yo Momma 50K Trail Run
2015-05-09
USA / East North Central / Ohio / Circleville
Ultramarathon - 50 kilometers
Trail Relay

50's For Yo Momma

50's For Yo Momma 50 Mile Trail Run
2015-05-09
USA / East North Central / Ohio / Circleville
Ultramarathon - 50 miles
Trail

First Ever Plymouth Greenbelt 50 Mile Ultra

2015-05-24
USA / New England / Massachusetts / Plymouth
Ultramarathon - 50 miles

Wickham Park Marathon

Wickham Park 100 Mile Fun Run
2015-05-24
USA / South Atlantic / Florida / Melbourne
Ultramarathon - 100 miles