2018 - 2019 Ultramarathon Calendar in May

Browse our Ultramarathon Calendar for races organized around the world during the month of May among 417 races.

417 races

Knock on Wood

Knock on Wood 100
2019-05-03 - 20:00
North America / USA / South Atlantic / South Carolina / Greenville
Ultramarathon
Trail Running Solo

Knock on Wood

Forest Freak 50K
2019-05-03 - 08:01
North America / USA / South Atlantic / South Carolina / Greenville
Ultramarathon
Trail Running Solo

Knock on Wood

UnBreakable 50
2019-05-03 - 20:00
North America / USA / South Atlantic / South Carolina / Greenville
Ultramarathon
Trail Running Solo

Salt Flats 100 Mile Endurance Run

Salt Flats 50 Miles
2019-05-03
North America / USA / Mountain Region / Utah / Wendover
Ultramarathon
Desert Trail Running Solo

Salt Flats 100 Mile Endurance Run

Salt Flats 100
2019-05-03 - 07:00
North America / USA / Mountain Region / Utah / Wendover
Ultramarathon
Desert Trail Running Solo

Salt Flats 100 Mile Endurance Run

Salt Flats 50K
2019-05-03
North America / USA / Mountain Region / Utah / Wendover
Ultramarathon
Desert Trail Running Solo

Big A 50K Trail Run

2019-05-04
North America / USA / New England / Maine / York
Ultramarathon
Trail Running Solo

Cheyenne Mountain Ultra 10x5k

50K - 2 Person Relay
2019-05-04
North America / USA / Colorado Springs
Ultramarathon
Mountain Trail Running Relay

Cheyenne Mountain Ultra 10x5k

50K
2019-05-04
North America / USA / Colorado Springs
Ultramarathon
Mountain Trail Running Solo

Cheyenne Mountain Ultra 10x5k

50K - 5 Person Relay
2019-05-04
North America / USA / Colorado Springs
Ultramarathon
Mountain Trail Running Relay

Chompawamsic 50K and 100K Challenge

50K
2019-05-04 - 07:00
North America / USA / South Atlantic / Virginia / Triangle
Ultramarathon
Trail Running Solo

Chompawamsic 50K and 100K Challenge

100K
2019-05-04 - 07:00
North America / USA / South Atlantic / Virginia / Triangle
Ultramarathon
Trail Running Solo

Collegiate Peaks Trail Run

50M Trail Run
2019-05-04 - 06:30
North America / USA / Mountain Region / Colorado / Buena Vista
Ultramarathon
Mountain Trail Running Mountain Multiple loops Solo

Gateway 50K & 25K

50K
2019-05-04
North America / USA / South Atlantic / Virginia / Blacksburg
Ultramarathon
Trail Running Solo

Golden Gate Relay

125 miles
2019-05-04 - 07:00
North America / USA / Pacific / California / Calistoga
Ultramarathon
Road Running Relay
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