2016 - 2017 USA Ultramarathon Calendar in May

Browse our Ultramarathon Calendar for races organized in USA during the month of May among 128 races.

128 races

PEAK Ultra Marathon

30 Miles
May 04, 2017 Race day in 7 months
USA / New England / Vermont / Pittsfield
Ultramarathon - 30 miles
Trail

Wild Wild West Marathon

50K Ultra
May 06, 2017 Race day in 7 months
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 7 months
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 7 months
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 7 months
USA / West South Central / Texas / Waxahachie
Ultramarathon - 50 miles
Relay

Greenland Trail 50k

Greenland Trail 50k
May 06, 2017 Race day in 7 months
USA / Mountain Region / Colorado / Larkspur
Ultramarathon - 50 kilometers
Trail Fast

Horseshoe Lake Trail Run

Horseshoe Lake 50K
May 06, 2017 Race day in 7 months
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 7 months
USA / Mid-Atlantic / New York / Hilton
Ultramarathon - 1000 kilometers

Addison Oaks Challenge

Marathon Double (3.1 + 26.2)
May 06, 2017 Race day in 7 months
USA / East North Central / Michigan / Leonard
Ultramarathon - 29.400 miles

Miwok 100K Trail Race

May 06, 2017 Race day in 7 months
USA / Pacific / California / Rodeo Lagoon
Ultramarathon - 100 kilometers
UTMB Qualifier Trail Western States Qualifier

Rock The Ridge 50-Mile Endurance Challenge

May 06, 2017 Race day in 7 months
USA / Mid-Atlantic / New York / New Palz
Ultramarathon - 50 miles
Walk Charity Trail Relay

Addison Oaks Challenge

Sunday Marathon Double (3.1 + 26.2)
May 06, 2017 Race day in 7 months
USA / East North Central / Michigan / Leonard
Ultramarathon - 29.400 miles

Wambaw Swamp Stomp 50 Miler Trail Run and Relay

May 06, 2017 Race day in 7 months
USA / South Atlantic / South Carolina / Cordesville
Ultramarathon - 50 miles
Trail Relay

PEAK Ultra Marathon

200 Miles
May 11, 2017 Race day in 8 months
USA / New England / Vermont / Pittsfield
Ultramarathon - 200 miles
Trail

PEAK Ultra Marathon

100 Miles
May 13, 2017 Race day in 8 months
USA / New England / Vermont / Pittsfield
Ultramarathon - 100 miles
Trail