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
15 listedStarted
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 ↗Started · Through
Albi 24 Heures
Albi, France
24-Hour
Follow organizer updates ↗
Next 30 days
26 racesStarting after today, through Nov 16, 2026.
Ultra X South Africa
Western Cape, South Africa
Stage Race
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
Latest results
Hainesport Endurance Run
Lisa Perry won the 48-hour race outright with 141.76 miles (143 laps), ahead of Thomas Crayton on 138.78 miles. Sean O’Connor won the 100-mile race in 16:05:12 and Thomas Pulaski the Saturday 24-hour with 100.12 miles.
Read results →Heartland 100
Braden Brown won the 2026 Heartland 100 Miler in 19:52:55. Finley Johnson won the women’s race in 23:52:22, seventh overall.
Read results →Midstate Massive Ultra Trail 100M
Nick Schroeder leads the published preliminary 100-mile results in 19:58:53. Alexandria Leveille is the first woman in 26:11:16, 14th overall.
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.