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
16 listedStarted
Cobb & Co Backyard Ultra
Tandur, Queensland, Australia
Backyard Ultra
Follow organizer updates ↗Started
God’s Own Backyard Ultra
Hunters Greave, Hawksworth, Leeds, England, United Kingdom
Backyard Ultra
Follow organizer updates ↗Started
Roosters Backyard Ultra
Rohr Park, Bonita (Chula Vista), California, USA
Backyard Ultra
Follow organizer updates ↗
Next 30 days
29 racesStarting after today, through Dec 14, 2026.
Beyond the Ultimate Desert Ultra
Namib Desert, Namibia
Stage Race
Authentic Phidippides Run
Athens to Sparta and back, Greece
200+ Mile
Backyard Ultra Villa Carlos Paz
Villa Carlos Paz, Córdoba, Argentina
Backyard Ultra
Bariloche by UTMB
San Carlos de Bariloche, Patagonia, Argentina
Fixed-Distance
Latest results
Antarctic Ice Ultra
Yusheng Ni of China won the 100 miles at the 2026 Antarctic Ice Ultra in 17:02:24, taking more than five and a half hours off his own Antarctic record. Stephanie Case of Canada ran 17:31:39, the first women’s 100-mile finish at the race.
Read results →Arrowtown Backyard Ultra
Krisztian Kormos won Arrowtown 2026 with 35 laps (234.85 km). Glenn Sutton completed 34 laps (228.14 km), the assist; Ethan De Rose completed 32.
Read results →Big Tex Backyard Ultra
Kelly Swanson won the 2026 Big Tex Backyard Ultra outright; RunSignup’s official results credit her with 37 laps (154.17 miles), far past the old course record of 28. Abby Bandi was the assist with 36 laps, and Nicole Cruz and Jerry Hanna each completed 30.
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.
Selected guides
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.