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
Sri Chinmoy Self-Transcendence 3100 Mile Race
Jamaica, Queens, New York City, New York, USA
Fixed-Distance
Follow organizer updates ↗Started · Through
Hainesport Endurance Run
Hainesport, New Jersey, USA
48-Hour
Follow organizer updates ↗Started · Through
Heartland 100
Cassoday, Kansas, USA
Fixed-Distance
Follow organizer updates ↗
Next 30 days
17 racesStarting after today, through Nov 10, 2026.
Diagonale des Fous
Saint-Pierre to Saint-Denis, Réunion
Fixed-Distance
Pony Express Trail 100
Faust to Simpson Springs, Utah, USA
Fixed-Distance
Albi 24 Heures
Albi, France
24-Hour
Dutch Backyard Ultra
Zeewolde, Netherlands
Backyard Ultra
Latest results
Oil Creek 100 Trail Runs — 100 Mile
Steven Larick won the 2026 Oil Creek 100 in 19:58:03, ahead of Clinton Hepler (21:53:11) and Dan McDaniel (23:17:09). Danica Williams was the first woman in 25:13:18, 10th overall. RunSignup lists 32 finishers and 25 DNFs.
Read results →48 Heures de Royan
Rodrigo Freeman Lopez won the 2026 48 Heures de Royan with 301.4 km (264 laps), ahead of Said Bourjila with 272.8 km. Beatrice Bourlon was the first woman and third overall with 269.4 km. In the 24-hour race, Christophe Pubert led with 191.7 km and Sophie Boiron was the first woman with 167.8 km.
Read results →Kodiak 100M
Cody Poskin won the 2026 Kodiak 100M in 16:46:21, ahead of Alex Proctor (17:23:05) and Max Jolliffe (18:15:45). Nichole Abma of Canada was the first woman in 20:43:40, 11th overall. 279 of 428 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.