2017 - 2018 USA Ultramarathon Calendar in May

Browse our Ultramarathon Calendar for races organized in USA during the month of May among 134 races.

134 races

PEAK Ultra Marathon

30 Miles
May 04, 2017 Race day in about 1 month
USA / New England / Vermont / Pittsfield
Ultramarathon - 30 miles
Trail

Cures for the Colors

100 Mile
May 06, 2017 Race day in about 1 month
USA / South Atlantic / North Carolina / Goldsboro
Ultramarathon - 100 miles

Wildflower Half

50K
May 06, 2017 Race day in about 1 month
USA / West South Central / Texas / Bastrop
Ultramarathon - 50 kilometers

Wild Wild West Marathon

50K Ultra
May 06, 2017 Race day in about 1 month
USA / Pacific / California / Lone Pine
Ultramarathon - 50 kilometers
Trail Mountain

Hachie 50 Marathon, Ultra and Relay

50k Ultra-marathon
May 06, 2017 Race day in about 1 month
USA / West South Central / Texas / Waxahachie
Ultramarathon - 50 kilometers

Hachie 50 Marathon, Ultra and Relay

50 Mile Ultra-marathon
May 06, 2017 Race day in about 1 month
USA / West South Central / Texas / Waxahachie
Ultramarathon - 50 miles

Hachie 50 Marathon, Ultra and Relay

50 Mile Ultra Relay
May 06, 2017 Race day in about 1 month
USA / West South Central / Texas / Waxahachie
Ultramarathon - 50 miles
Relay

Wild Wild West Marathon

50M Run
May 06, 2017 Race day in about 1 month
USA / Pacific / California / Lone Pine
Ultramarathon - 50 miles
Trail Mountain

Armstrong Redwoods

Armstrong Redwoods 50K
May 06, 2017 Race day in about 1 month
USA / Pacific / California / Guerneville
Ultramarathon - 50 kilometers
Hilly Trail

Big A 50K Trail Run

May 06, 2017 Race day in about 1 month
USA / New England / Maine / York
Ultramarathon - 50 kilometers
Charity Trail

Greenland Trail 50k

Greenland Trail 50k
May 06, 2017 Race day in about 1 month
USA / Mountain Region / Colorado / Larkspur
Ultramarathon - 50 kilometers
Trail Fast

Horseshoe Lake Trail Run

Horseshoe Lake 50K
May 06, 2017 Race day in about 1 month
USA / Pacific / California / Palo Alto
Ultramarathon - 50 kilometers
Coastal Trail Runs Hilly Walk Trail

5K for FA

Kids Fun Run
May 06, 2017 Race day in about 1 month
USA / Mid-Atlantic / New York / Hilton
Ultramarathon - 1000 kilometers

Massanutten Mountain Trails 100 Mile Run

May 06, 2017 Race day in about 1 month
USA / South Atlantic / Virginia / Fort Valley
Ultramarathon - 100 miles
UTMB Qualifier Trail Western States Qualifier

Miwok 100K Trail Race

May 06, 2017 Race day in about 1 month
USA / Pacific / California / Rodeo Lagoon
Ultramarathon - 100 kilometers
UTMB Qualifier Trail Western States Qualifier