Tough Mudder Endurance Series

Mudders with their headlights on as they start Endurance mud course run at night

ARE YOU TOUGH ENOUGH?

Our Endurance Series ties our most unforgiving events into the ultimate yearlong test of your toughness and grit.

Run as many laps of our legendary obstacle courses as you can in 8 or 24 hours (with wickedly inventive penalties) to discover just how far you can bend your boundaries.

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ENDURANCE SERIES EVENTS

TOUGH MUDDER INFINITY

Stack as many laps as your legs will allow.

TIME: 8 hours

LAP DISTANCE: 5K & 15K

RECORD: 85K

WORLD’S TOUGHEST MUDDER

The toughest event on the planet. Period.

TIME: 24 hours (Sat-Sun)

LAP DISTANCE: 5 miles

RECORD: 115 mi.

ENDURANCE EVENTS

2026

INFINITY Twin CitiesJun 27

WORLD’s TOUGHEST (UK)Jun 27 & 28

INFINITY ChicagoAug 29

INFINITY NashvilleOct 17

2027

INFINITY AustinFeb 27

INFINITY Los AngelesMar 20

INFINITY PhillyMay 22

INFINITY MichiganJun 12

FAQ

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WHAT ARE THE ENDURANCE SERIES FORMATS?

There are two different events formats in the Endurance Series in 2026. They are Tough Mudder Infinity, and World’s Toughest Mudder.

HOW LONG ARE ENDURANCE SERIES EVENTS

Endurance Series events don’t have a fixed distance, they have a fixed time limit. The challenge is simple: complete as many laps as you can before time runs out. Tough Mudder Infinity events are 8 hours long, beginning Saturday morning. World’s Toughest Mudder is a full 24-hours, beginning on Saturday morning and ending on Sunday.

ARE THE ENDURANCE SERIES EVENTS COMPETITIVE?

Sort of. Unlike most Tough Mudder events, the events in the Endurance Series have timing chips and leaderboards; however, the expectation is that the athletes will uphold the Tough Mudder values, including helping those around them, These events are ultimately about seeing what you’re capable of, not leaving other athletes in the mud.

Will the Holy Grail Take Place in 2026?

Not this year. The Holy Grail very much remains as part of Tough Mudder, but it’s taking a break from the 2026 line-up.