The Practical Guide to Ultra Endurance
Learn to Go Farther
Than One Day
Find a race, adapt a training framework, and build a pacing or crew plan for 24-hour, 48-hour, six-day, backyard, and stage events.
Around the race calendar
Races & Results
Calendar snapshot: . Race windows follow listed dates; organizers provide live updates.
Racing now
5 listedStarted · Through
Sri Chinmoy Self-Transcendence 3100 Mile Race
Jamaica, Queens, New York City, New York, USA
Fixed-Distance
Follow organizer updates ↗Started · Through
Grand to Grand Ultra
Grand Canyon to Grand Staircase, Utah/Arizona, USA
Stage Race
Follow organizer updates ↗Started · Through
Ultra BOLIVIA Race
Altiplano and Salar de Uyuni, Bolivia
Stage Race
Follow organizer updates ↗
Next 30 days
29 racesStarting after today, through Oct 25, 2026.
A Lenda Backyard Ultra
Cajamar, São Paulo, Brazil
Backyard Ultra
Lisboa Backyard Ultra
Monsanto Forest Park, Lisbon, Portugal
Backyard Ultra
Spartathlon
Athens to Sparta, Greece
Fixed-Distance
Australian 6 Day Ultramarathon Festival
Paradise, South Australia, Australia
6-Day
Latest results
Flagstaff to Grand Canyon Stagecoach Line 100
Landon Tutt won the men's 100-mile run in 21:50:14 and Jessica Henning won the women's race in 24:26:12.
Read results →IMTUF 100
Benjamin Stout won in 18:46:47 and Ginny Robbins won the women's race in 23:07:03, eighth overall; UltraSignup lists 107 finishers.
Read results →Mountain Lakes 100
Jessica Quinn won outright in 18:38:56, and Shawn Ross was the first man, third overall, in 19:56:45; UltraSignup lists 91 finishers.
Read results →
What are you planning?
Choose a format →
Compare the clock, course, support, and withdrawal options before you enter.
Find your next race →
Search by place, then filter race format, region, and terrain. Official links let you check entry details.
Build a pacing scenario →
For example: 120 km in 24 hours with two hours stopped leaves 22 moving hours, or 11:00 per km. Change the assumptions to see the effect.
The pacing example illustrates arithmetic, not a recommended race target. Explore all planning tools →
Beyond the marathon
What Is Multiday Running?
Multiday running covers events whose clock or stages extend through day-night cycles or across several days. From 24-hour tracks to week-long stage races, the format makes walking, food, rest, equipment, support, and changing conditions part of the plan.
New to the broader sport? Start with how long an ultramarathon is and how fixed-distance, timed, and multiday formats differ.
Read the full introduction →
Not Just Speed
Pacing, food tolerance, rest, equipment, and problem-solving can matter alongside fitness.
Mental Skills Matter
Boredom, motivation, and problem-solving can influence persistence alongside physical fitness.
A Community Sport
Crews, pacers, aid station volunteers, and fellow runners all shape the race.
Find your format
Choose Your Path
Multiday running comes in many formats. Each demands different preparation, strategy, and gear. Compare the rules, support, withdrawal plan, and skills you are prepared to practice.
Most read
Featured Guides
How to Train for Your First 24-Hour Race
Read guide →Backyard Ultras Explained: Rules, Records, and Safety
Read guide →24-Hour Race Pacing Strategy
Read guide →Backyard Ultra Race Strategy
Read guide →What to Eat During a 24-Hour Race
Read guide →Blister Prevention for Ultramarathons
Read guide →From the Research
Our guides draw on current exercise physiology, biomechanics, and sports psychology research where evidence exists, with uncertainty and study limits explained. Read our editorial policy for how sources, illustrative examples, and professional review are distinguished.
Odds ratio linking higher boredom with an action crisis in one mixed solo/relay 24-hour study
A better race-day rule
Persistence Never Outranks Safety
Ordinary fatigue and doubt may pass. Confusion, involuntary sleep, loss of coordination, collapse, chest pain, severe breathing difficulty, or repeated vomiting call for a stop and medical assessment—not a motivational slogan.
Ready to Go Beyond One Day?
Compare race formats, learn the core terminology, and identify the health, training, support, and logistics questions to answer next.
Explore Start Here →