Worldwide 2017 – 2018 Ultramarathon Calendar

Looking for a comprehensive guide to 2017 – 2018 ultramarathons organized around the world? You can browse our list of half marathons or filter down the selection to a specific location, month or type of race. You’ll find iconic 100 milers, shorter races to test yourself in the ultra world, road races, mountain races, races in deserts. The diversity of ultra races is really amazing.

We consider any race longer than 42.195km or 26.1mi to be an ultramarathon if it is run in a single stage. If you’re looking for races that have a specific fixed duration (ex : 24hr races), you can check the X-hour race calendar. If you like races run on several stages across several days, check our Multiday race calendar

If you’re looking for new 2013 – 2014 ultramarathons to compete in, this is the place to start searching. More than 1,800 ultramarathons are listed in over 75 countries around the world.

3,353 races

Ragnar Relay Colorado

August 25, 2017 Race day in 3 days
USA / Mountain Region / Colorado / Aspen
Ultramarathon
Ragnar Relay Series Mountain Relay

T184 The Thames Path

August 25, 2017 Race day in 3 days
United Kingdom / England / Greater London / Thames Barrier, London
Ultramarathon
UTMB Qualifier

Ultra-Trail Côte d'Azur Mercantour

August 25, 2017 Race day in 3 days
France / Provence-Alpes-Côte d'Azur / Alpes-Maritimes / St Martin-Vésubie
Ultramarathon
Trail Mountain UTMB Qualifier

Achill Back to Back Marathon (August)

August 26, 2017 Race day in 4 days
Ireland / Connacht / Achill Island
Ultramarathon
Hilly Fun Road Running

Andes Race “The Chaski Challenge”

August 26, 2017 Race day in 4 days
Peru / Cusco
Ultramarathon
Trail Mountain

Baker Trail UltraChallenge

August 26, 2017 Race day in 4 days
USA / Mid-Atlantic / Pennsylvania / Brookville
Ultramarathon
Trail

Bulldog 50K and 25K

August 26, 2017 Race day in 4 days
USA / Pacific / California / Calabasas
Ultramarathon
Trail

Cascade Crest 100 Mile Endurance Run

August 26, 2017 Race day in 4 days
USA / Pacific / Washington / Easton
Ultramarathon
Trail UTMB Qualifier

Chefchaouen la Traversée Trail

August 26, 2017 Race day in 4 days
Morocco / Chefchaouen
Ultramarathon
Trail

Chefchaouen la Traversée Trail

August 26, 2017 Race day in 4 days
Morocco / Chefchaouen
Ultramarathon
Trail Relay

Chiltern Way Ultra

August 26, 2017 Race day in 4 days
United Kingdom / England / Hertfordshire / Hemel Hemstead
Ultramarathon
Trail Challenge Running

Cimasarun

August 26, 2017 Race day in 4 days
Réunion / Hell-Bourg
Ultramarathon
Trail Randorun Ocean Indien Mountain
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