2016 - 2017 USA Ultramarathon Calendar in May

Browse our Ultramarathon Calendar for races organized in USA during the month of May among 126 races.

126 races

Wild Wild West Marathon

50K Ultra
May 06, 2017 Race day in 10 months
USA / Pacific / California / Lone Pine
Ultramarathon - 50 kilometers
Trail Mountain

Greenland Trail 50k

Greenland Trail 50k
May 06, 2017 Race day in 10 months
USA / Mountain Region / Colorado / Larkspur
Ultramarathon - 50 kilometers
Trail Fast

5K for FA

Kids Fun Run
May 06, 2017 Race day in 10 months
USA / Mid-Atlantic / New York / Hilton
Ultramarathon - 1000 kilometers

Miwok 100K Trail Race

May 06, 2017 Race day in 10 months
USA / Pacific / California / Rodeo Lagoon
Ultramarathon - 100 kilometers
UTMB Qualifier Trail Western States Qualifier

Paiute Meadows Trail 50K

50K Ultra
May 13, 2017 Race day in 10 months
USA / Pacific / California / Susanville
Ultramarathon - 50 kilometers
Trail

Ice Age Trail 50

Ice Age Trail 50K
May 13, 2017 Race day in 10 months
USA / East North Central / Wisconsin / La grange
Ultramarathon - 50 kilometers
Trail

Ice Age Trail 50

Ice Age Trail 50M
May 13, 2017 Race day in 10 months
USA / East North Central / Wisconsin / La grange
Ultramarathon - 50 miles
UTMB Qualifier Trail

PCT50 Trail Run

May 13, 2017 Race day in 10 months
USA / Pacific / California / Cleveland National Forest
Ultramarathon - 50 miles
Trail

Keys 100

Keys 100 Mile
May 20, 2017 Race day in 10 months
USA / South Atlantic / Florida / Key Largo
Ultramarathon - 100 miles
Charity Relay

Keys 100

Keys 50K Race
May 20, 2017 Race day in 10 months
USA / South Atlantic / Florida / Key Largo
Ultramarathon - 50 kilometers
Relay

Keys 100

Keys 50 Mile Race
May 20, 2017 Race day in 10 months
USA / South Atlantic / Florida / Key Largo
Ultramarathon - 50 miles

Spring Superior Trail Races

Spring Superior Trail 50 k
May 20, 2017 To be confirmed Race day in 10 months
USA / West North Central / Minnesota / Lutsen
Ultramarathon - 50 kilometers
Trail

Chippewa Moraine 'A Run for the AGES'

Chippewa 50K Trail Run
May 27, 2017 Race day in 10 months
USA / East North Central / Wisconsin / New Auburn
Ultramarathon - 50 kilometers
Trail

Run Madtown

Conquer the Capital 45.5 Challenge
May 27, 2017 Race day in 10 months
USA / East North Central / Wisconsin / Madison
Ultramarathon - 45.500 miles

OBX Ultramarathon

May 02, 2015 No race in 2016 The race has already taken place.
USA / South Atlantic / North Carolina / Corolla
Ultramarathon - 50 kilometers
Flat Fun Green Trail North Carolina Ultra Series Sand Barefoot