Highest DNF Rates

MAR

Barkley Marathons

Frozen Head State Park, United States

1 FEB 2027

Montane Yukon Arctic Ultra

Whitehorse, Canada

11 JAN 2027

The Spine Race

Edale, United Kingdom

4 MAY 2026

Cocodona 250

Black Canyon City, United States

27 SEP 2026

Spartathlon

Athens, Greece

12 JUN 2026

Tahoe 200

Homewood, United States

17 JAN 2027

HURT 100

Honolulu, United States

24 AUG 2026

PTL - Petite Trotte à Léon

Chamonix, France

22 AUG 2026

The Brutal

Llanberis, United Kingdom

JUN

Bob Graham Round

Keswick, United Kingdom

6 FEB 2027

Hong Kong Four Trails Ultra Challenge

Hong Kong, Hong Kong

12 APR 2026

Kullamannen by UTMB

Mölle, Sweden

11 APR 2026

Ultra Fiord

Puerto Natales, Chile

3 OCT 2026

Angeles Crest 100

Wrightwood, United States

16 MAY 2026

Hardrock Hundred

Silverton, United States

15 AUG 2026

Leadville Trail 100

Leadville, United States

12 APR 2026

Ronda dels Cims

Andorra la Vella, Andorra

24 AUG 2026

Self-Transcendence 3100 Mile Race

New York, United States

20 SEP 2026

Tor des Géants

Courmayeur, Italy

4 OCT 2026

Ultra Gobi

Hami, China

16 OCT 2026

Canal des Deux Mers

Toulouse, France

20 NOV 2026

Coast to Kosciuszko

Eden, Australia

14 AUG 2026

Fat Dog 120

Manning Park, Canada

5 SEP 2026

Kerry Way Ultra

Killarney, Ireland

16 SEP 2026

La Ultra - The High

Leh, India

17 AUG 2026

Ring O' Fire

Holyhead, United Kingdom

25 SEP 2026

Ultra Pirineu 100 Mile

Bagà, Spain

24 AUG 2026

Ultra-Trail du Mont-Blanc

Chamonix, France

24 APR 2026

Ultra-Trail Mt. Fuji

Kawaguchiko, Japan

16 JUL 2026

UT4M

Grenoble, France

25 JUL 2026

Andes Race

Huaraz, Peru

12 SEP 2026

Dragon's Back Race

Conwy, United Kingdom

31 MAY 2026

Grindstone 100

Swoope, United States

12 APR 2026

Istria 100

Buzet, Croatia

3 MAY 2026

Jungle Marathon

Santarém, Brazil

24 JUL 2026

Lakeland 100

Coniston, United Kingdom

16 APR 2026

Massanutten Mountain Trails 100

Harrisonburg, United States

28 FEB 2027

Rovaniemi 150

Rovaniemi, Finland

11 JUL 2026

Sinister 7 Ultra

Blairmore, Canada

11 SEP 2026

Superior 100

Gooseberry Falls, United States

30 AUG 2026

Swiss Peaks Trail

Oberwald, Switzerland

30 APR 2026

TDS

Courmayeur, Italy

26 APR 2026

Ultra Balaton

Balatonfüred, Hungary

9 APR 2026

Ultra Trail Annapurna

Pokhara, Nepal

24 APR 2026

Ultra-Trail Mt. Fuji

Kawaguchiko, Japan

6 SEP 2026

Wasatch Front 100

Kaysville, United States

25 SEP 2026

Bear 100

Logan, United States

15 MAY 2026

Ultra-Trail Snowdonia

Llanberis, United Kingdom

13 JUN 2026

Andorra Ultra Trail

Ordino, Andorra

24 MAY 2026

Cape Wrath Ultra

Fort William, United Kingdom

10 OCT 2026

Centurion Autumn 100

Goring-on-Thames, United Kingdom

12 JUN 2026

Dolomiti Extreme Trail

Feltre, Italy

21 MAR 2027

Georgia Death Race

Blairsville, United States

24 APR 2026

Madeira Island Ultra Trail

Porto Moniz, Portugal

27 NOV 2026

Oman by UTMB

Nizwa, Oman

26 NOV 2026

Oman by UTMB

Muscat, Oman

24 OCT 2026

Original Mountain Marathon Ultra

Undisclosed, United Kingdom

13 SEP 2026

Pirin Ultra

Bansko, Bulgaria

6 JUN 2026

South Downs Way 100

Winchester, United Kingdom

29 MAY 2026

Swiss Canyon Trail

Grindelwald, Switzerland

16 MAY 2026

The Track

Alice Springs, Australia

11 APR 2026

Transgrancanaria

Las Palmas, Spain

19 SEP 2026

Ultra Paine

Torres del Paine, Chile

20 JUN 2026

West Highland Way Race

Milngavie, United Kingdom

28 JUN 2026

Western States 100

Olympic Valley, United States

12 APR 2026

Eiger Ultra Trail E101

Grindelwald, Switzerland

17 MAY 2026

Gaoligong by UTMB

Tengchong, China

29 APR 2026

Innsbruck Alpine Trailrun Festival

Innsbruck, Austria

11 JUL 2026

Lakes Sky Ultra

Ambleside, United Kingdom

25 APR 2026

Patagonia Run

San Martín de los Andes, Argentina

7 NOV 2026

Pinhoti 100

Sylacauga, United States

12 APR 2026

Salomon Ultra Pirineu

Bagà, Spain

12 APR 2026

Ultra Sierra Nevada

Granada, Spain

5 JUL 2026

Val d'Aran by UTMB

Vielha, Spain

27 JUN 2026

90km du Mont-Blanc

Chamonix, France

1 MAY 2026

Badwater 135

Death Valley, United States

15 NOV 2026

Beast Runners Taiwan 100K

Nantou, Taiwan

11 APR 2026

Buffalo Stampede

Bright, Australia

2 AUG 2026

CCC - Courmayeur-Champex-Chamonix

Courmayeur, Italy

14 JUN 2026

Comrades Marathon

Durban, South Africa

15 JUL 2026

Eiger Ultra Trail

Grindelwald, Switzerland

15 NOV 2026

Everest Trail Race

Lukla, Nepal

3 OCT 2026

Kalahari Augrabies Extreme Marathon

Augrabies Falls, South Africa

24 JUN 2026

Lavaredo Ultra Trail

Cortina d'Ampezzo, Italy

10 OCT 2026

Lesotho Ultra Trail

Roma, Lesotho

15 AUG 2026

Mauerweglauf Berlin Wall 100

Berlin, Germany

16 MAY 2026

Pikes Peak Ultra

Manitou Springs, United States

12 APR 2026

Selvatica Ultra Trail

Mérida, Mexico

14 FEB 2027

Tarawera Ultramarathon 100 Mile

Rotorua, New Zealand

12 APR 2026

Tatra Ultra

Zakopane, Poland

19 APR 2026

Tenerife Bluetrail

Puerto de la Cruz, Spain

7 FEB 2027

The Coastal Challenge

Quepos, Costa Rica

18 JUL 2026

Ultra Dinarica

Ljubljana, Slovenia

17 MAY 2026

Ultra Trail Côte d'Azur

Roquebrune-Cap-Martin, France

12 SEP 2026

Ultra Trail Mount Robson

Valemount, Canada

19 SEP 2026

Ultra Trail Torres del Paine

Torres del Paine, Chile

22 NOV 2026

Ultra-Trail Cape Town

Cape Town, South Africa

22 MAY 2026

Ultra-Trail Transylvania

Bran, Romania

15 AUG 2026

Waldo 100K

Oakridge, United States

18 JUN 2026

Zugspitz Ultratrail

Grainau, Germany

23 MAY 2026

Corfu Mountain Trail

Corfu Town, Greece

12 APR 2026

Doi Inthanon Thailand Ultra

Chom Thong, Thailand

17 JAN 2027

Hong Kong 100 Ultra Trail Race

Hong Kong, Hong Kong

15 NOV 2026

Kailas Fansipan Mountain Trail

Sapa, Vietnam

23 MAY 2026

Mozart 100

Salzburg, Austria

18 APR 2026

Penyagolosa Trails MiM

Castellón de la Plana, Spain

13 JUN 2026

Rio do Rastro Ultra

Urubici, Brazil

3 MAY 2026

Thailand by UTMB

Chiang Mai, Thailand

1 MAY 2026

Ultra Trail Serra da Estrela

Seia, Portugal

17 MAY 2026

Ultra-Trail Australia

Katoomba, Australia

13 MAY 2026

Atacama Crossing (4 Deserts)

San Pedro de Atacama, Chile

4 AUG 2026

Australian 24 Hour Championships

Adelaide, Australia

4 APR 2027

Blackwater 50

Davis, United States

17 OCT 2026

Cappadocia Ultra-Trail

Ürgüp, Turkey

1 AUG 2026

Centurion North Downs Way 50

Farnham, United Kingdom

20 SEP 2026

Copenhagen 100

Copenhagen, Denmark

31 MAY 2026

Copper Canyon Ultra Marathon

Urique, Mexico

14 MAR 2027

Dalat Ultra Trail

Dalat, Vietnam

10 MAY 2026

Ecuador Volcano Ultra

Quito, Ecuador

12 AUG 2026

Fjällräven Classic Ultra

Nikkaluokta, Sweden

27 JUN 2026

Gobi Desert 100

Dunhuang, China

27 JUN 2026

Gobi March

Hami, China

27 JUN 2026

Gobi March (4 Deserts)

Jiayuguan, China

20 JUN 2026

Golden Ring Ultra-Trail

Suzdal, Russia

1 NOV 2026

Javelina Jundred

Fountain Hills, United States

1 AUG 2026

Kilimanjaro Stage Run

Moshi, Tanzania

20 JUN 2026

Namibia Ultra Marathon

Sossusvlei, Namibia

14 NOV 2026

Niger Ultra

Agadez, Niger

25 OCT 2026

Sahara Race (4 Deserts)

Merzouga, Morocco

20 JUN 2026

Salomon Ring of Steall Skyrace

Kinlochleven, United Kingdom

10 MAY 2026

Sardinia Trail

Dorgali, Italy

6 MAY 2026

Shiga Kogen Extreme Trail

Shiga Kogen, Japan

7 FEB 2027

The Coastal Challenge

Quepos, Costa Rica

28 AUG 2026

Transalpine Run

Garmisch-Partenkirchen, Germany

12 APR 2026

Transgrancanaria HG 50K

Las Palmas, Spain

9 MAY 2026

Transvulcania Ultramarathon

Los Llanos de Aridane, Spain

16 SEP 2026

Ultra Selvagem

Chapada dos Veadeiros, Brazil

7 MAR 2027

Ultra Trail Bogotá

Bogotá, Colombia

23 APR 2026

Ultra-Trail Drakensberg

Underberg, South Africa

2 MAY 2026

Ultra-Trail Mt. Aso Round Trail

Aso, Japan

4 APR 2027

Umstead 100

Raleigh, United States

30 MAY 2026

EcoTrail Oslo

Oslo, Norway

8 AUG 2026

Karhunkierros Trail Ultra

Ruka, Finland

28 JUN 2026

Lake Saroma 100km Ultramarathon

Saroma, Japan

13 APR 2026

Marathon des Sables

Ouarzazate, Morocco

14 NOV 2026

Oxfam Trailwalker Hong Kong

Hong Kong, Hong Kong

25 JUL 2026

Swiss Alpine Marathon

Davos, Switzerland

14 MAR 2027

Ultra Africa Race

Kigali, Rwanda

14 MAR 2027

Ultra-Trail Cape Epic

Stellenbosch, South Africa

12 APR 2026

Adidas Infinite Trails

Bad Gastein, Austria

8 AUG 2026

Amsterdam 100

Amsterdam, Netherlands

1 JUN 2026

Antarctic Ice Marathon

Union Glacier, Antarctica

12 APR 2026

Chaski Challenge

Cusco, Peru

2 JUL 2026

Cordillera Mountain Ultra

Baguio, Philippines

17 JAN 2027

Country to Capital Ultra

Wendover, United Kingdom

12 AUG 2026

El Cruce Columbia

Villa La Angostura, Argentina

9 MAY 2026

Great Wall Marathon Ultra

Huangyaguan, China

20 MAR 2027

Jordan Ultra

Dana, Jordan

4 JUL 2026

Kepler Challenge

Te Anau, New Zealand

18 JUL 2026

Laugavegur Ultra Marathon

Landmannalaugar, Iceland

25 JUN 2026

Marathon du Mont-Blanc

Chamonix, France

18 JUL 2026

Mongolia Sunrise to Sunset Ultra

Ulaanbaatar, Mongolia

18 OCT 2026

Mount Kinabalu International Climbathon

Kundasang, Malaysia

15 JAN 2027

Run the Rann

Kutch, India

22 NOV 2026

Sani Stagger

Underberg, South Africa

20 JUN 2026

Tromsø Midnight Sun Ultra

Tromsø, Norway

17 MAY 2026

Ultra-Trail Australia 50K

Katoomba, Australia

7 FEB 2027

Vibram Hong Kong 50K

Hong Kong, Hong Kong

14 MAR 2027

Wadi Rum Ultra Marathon

Wadi Rum, Jordan

8 MAY 2026

Bandera 50K

Bandera, United States

11 APR 2026

Brazos Bend 50

Needville, United States

12 JUL 2026

Colombia Ultra Trail

Salento, Colombia

14 JUN 2026

Comrades Marathon

Durban, South Africa

19 APR 2026

Connemara Ultra

Clifden, Ireland

14 MAR 2027

Hut2Hut Trail Run

Great Ocean Road, Australia

10 MAY 2026

Jeju Trail Running 50K

Seogwipo, South Korea

21 NOV 2026

JFK 50 Mile

Boonsboro, United States

15 APR 2026

Sri Lanka Ultra

Nuwara Eliya, Sri Lanka

20 JUN 2026

Tromsø Midnight Sun Marathon Ultra

Tromsø, Norway

30 JAN 2027

Waldo 50K

Oakridge, United States

12 APR 2026

Gorge Waterfalls 50K

Cascade Locks, United States

13 JUN 2026

Big Five Marathon

Entabeni, South Africa

8 AUG 2026

Big Red Run

Birdsville, Australia

4 MAY 2026

Comrades Marathon Qualifier 50K

Pietermaritzburg, South Africa

5 SEP 2026

Jungfrau Marathon Ultra

Interlaken, Switzerland

8 AUG 2026

Sierre-Zinal

Sierre, Switzerland

13 SEP 2026

Stockholm Trail Run 50K

Stockholm, Sweden

14 FEB 2027

Tarawera Ultramarathon 50K

Rotorua, New Zealand

6 JUN 2026

Uganda Marathon Ultra

Masaka, Uganda

7 MAR 2027

Way Too Cool 50K

Cool, United States