Ultramarathons in United States

1859 races tracked — the season peaks in October (271 races), with May close behind (223).

By distance 1388 50K · 307 50 mi · 101 100K · 51 100 mi
Biggest field JFK 50 Mile — 1,119 finishers in 2024
Steepest course Quad Rock 50 Mile — 137.5 m/km
Deepest results history New Years One Day 24 Hour Run — 10 recorded editions

Next starts in United States

All 1316 upcoming →
Fixed Distance50K
GRIT 2.5

Labor Day Triple (Mon)

Winter Park, FL, USA

50 km Sep 7
Timed6 hours
GRIT —

American Heroes Races - 6 Hour Run

Longmont, CO, USA

Sep 11
Fixed Distance50K
GRIT 2.5

American Heroes Races - 9 hour 11 minute Run

Longmont, CO, USA

50 km Sep 11
Fixed Distance50K
GRIT 2.5

Berkeley Trail Adventure

Berkeley, CA, USA

50 km Sep 12
Fixed Distance100K
GRIT 5

Boulder Field 100 - 100 km Ultra Run

Jim Thorpe, PA, USA

100 km Sep 12
Fixed Distance50K
GRIT 2.5

Boulder Field 100 - 50 km Ultra Run

Jim Thorpe, PA, USA

50 km Sep 12
Fixed Distance50K
GRIT 2.5

Chicago Trail Running Festival

Beecher, IL, USA

50 km Sep 12
Fixed Distance50KMountain
GRIT 5.9

Devil on the Divide Ultra

Empire, CO, USA

50 km 2,300 m D+ Sep 12
TimedOther timed
GRIT —

Dirty Fox Five Hour Trail Race

Fort Wayne, IN, USA

Sep 12
Fixed Distance50K
GRIT 2.5

Free to Run 50 Km

Pittsfield, MA, USA

50 km Sep 12
Fixed Distance50K
GRIT 2.5

Germantown 50k

Germantown, OH, USA

50 km Sep 12
Fixed Distance50KRolling
GRIT 3.9

Great Olympic Adventure 50km Trail Run

Port Angeles, WA, USA

50 km 915 m D+ Sep 12