2016 - 2017 North America Ultramarathon Calendar in May

Browse our Ultramarathon Calendar for races organized in North America during the month of May among 143 races.

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143 races

Wild Wild West Marathon

50K Ultra
May 06, 2017 Race day in 9 months
USA / Pacific / California / Lone Pine
Ultramarathon - 50 kilometers
Trail Mountain

Greenland Trail 50k

Greenland Trail 50k
May 06, 2017 Race day in 9 months
USA / Mountain Region / Colorado / Larkspur
Ultramarathon - 50 kilometers
Trail Fast

5K for FA

Kids Fun Run
May 06, 2017 Race day in 9 months
USA / Mid-Atlantic / New York / Hilton
Ultramarathon - 1000 kilometers

Miwok 100K Trail Race

May 06, 2017 Race day in 9 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

Scotiabank Calgary Marathon

Calgary Marathon 50K Ultra
May 28, 2017 Race day in 10 months
Canada / Alberta / Calgary
Ultramarathon - 50 kilometers
Charity Road Running