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
4 listedStarted · Through
Ultra X South Africa
Western Cape, South Africa
Stage Race
Follow organizer updates ↗Started
Dutch Backyard Ultra
Zeewolde, Netherlands
Backyard Ultra
Follow organizer updates ↗Started
World Backyard Ultra Team Championship
Bell Buckle, Tennessee, USA (and worldwide satellite sites)
Backyard Ultra
Follow organizer updates ↗
Next 30 days
25 racesStarting after today, through Nov 18, 2026.
International Ultramarathon Festival — Loutraki
Loutraki, Greece
48-Hour
The Endless Mile
Alabaster, Alabama, USA
48-Hour
Weekend at Burney
Cassel, near Burney, California, USA
48-Hour
Cactus Rose 100 Mile
Hill Country State Natural Area, Bandera, Texas, USA
Fixed-Distance
Latest results
Albi 24 Heures
Sigurdur Tomas Thorisson won the 2026 Albi 24 Heures with 240.1 km (161 laps). Gita Muceniece was second overall and first woman with 231.1 km, ahead of Benoit Gourves (207.3 km). Aurelie Verrier (196.8 km) and Marie-Line Mantoux (189.4 km) were the next women.
Read results →Bromont Ultra 160 km
Philippe Groleau won the 2026 Bromont Ultra 160 km in 18:42:49, ahead of Thomas Mathurin (19:38:51) and Jacob Couture (20:56:44). Anne Champagne was the first woman in 21:43:45, fifth overall. 51 runners finished.
Read results →Sonoma Fall Classic 100 Mile
Nick Reshetnikov won the first Sonoma Fall Classic 100 Mile in 20:01:06. Nicole Kurnik was the first woman and second overall in 20:55:25, ahead of Daniel Lingenfelter (21:22:52) and Hunter Olson (21:50:00). 36 of the 76 starters finished.
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.