A verified calendar of the world's major trail races and ultra-trail events. Every entry links to the official organizer, states the established recurring pattern, and honestly flags whether the next edition date has been officially announced. We never invent event dates.
Ultra-trail (or ultra-trail running) is the sport of running distances longer than a marathon (42.2 km) on off-road mountain trails — anything from 50 km to 330 km, with anything from 2,000 m to 24,000 m of cumulative ascent. It grew out of alpine mountain running in the early 2000s and is now a global sport with a structured qualifying system (the UTMB World Series) and professional fields.
The defining challenge is not just distance but the combination of distance, altitude, technical terrain and self-sufficiency. Cut-off times are generous enough to allow a mix of running and fast hiking, but the mountains, the weather and the cumulative fatigue make every ultra-trail a serious undertaking. Many of the races on this page are as much a test of mountain judgement and self-management as of running speed.
Start with distance and terrain you can already manage comfortably. If you have run a road marathon, your first ultra-trail should be a 50–55 km race with moderate elevation (Transvulcania's Half Marathon, the Mont Blanc Marathon 23K or 42K) — not a 100-miler. Build trail-running specificity (technical descents, runnable climbs, fueling on the move) before adding distance.
Then consider the race's character. Some ultras are runnable (Transvulcania, Mont Blanc Marathon) with fast trail and moderate technicality; others are mountain expeditions (UTMB, Tor des Géants, Hardrock) with high altitude, technical terrain and cut-offs that demand fast hiking as much as running. Match the race to your mountain experience, not just your running fitness.
The biggest races use qualification and lottery systems because demand far exceeds places. UTMB Mont-Blanc requires a valid UTMB Index (earned via UTMB World Series qualifying races) plus selection through a lottery. Western States 100 requires completing a qualifying 100-mile/100km race, then entering a lottery with roughly 1-in-7 odds. Hardrock 100 requires a qualifying 100-mile finish and has a small, competitive lottery.
Other races (Transvulcania, Mont Blanc Marathon, Marathon des Sables) use direct entry that sells out fast — register early on the official website. Tor des Géants requires qualifying points and a medical certificate. Always check the official race website for the current year's qualification thresholds and entry rules, which change year to year.
| Race | Country | Flagship distance | Elevation gain | Typical month | Entry system |
|---|---|---|---|---|---|
| UTMB Mont-Blanc | France/Italy/Switzerland | ~171 km | ~10,000 m | Late August | UTMB Index + lottery |
| Marathon des Sables | Morocco | ~250 km (6 stages) | Modest (heat/sand) | April | Direct entry |
| Western States 100 | USA | 100 miles (~161 km) | ~5,500 m ascent | Late June | Qualifying race + lottery |
| Tor des Géants | Italy | ~330 km | ~24,000 m | September | Qualifying points + medical |
| Hardrock 100 | USA (Colorado) | 100 miles (~161 km) | ~10,000 m | July | Qualifying race + lottery |
| Transvulcania | Spain (La Palma) | ~73 km | ~4,400 m | May | Direct entry |
| Dragon's Back Race | United Kingdom | ~315 km (5 stages) | ~16,000 m | September | Direct entry (experience) |
| Mont Blanc Marathon | France | 90 km | ~6,500 m | Late June | Direct entry |
These races are run in a single push — one continuous effort from start to finish, with aid stations but no overnight stops. They range from the runnable (Transvulcania, Mont Blanc Marathon) to the extreme (Tor des Géants at ~330 km).
These races unfold over multiple consecutive days, each day a self-contained stage. Marathon des Sables is self-sufficient (you carry all food and gear); the Dragon's Back Race is self-supported between checkpoints. They test multi-day endurance and recovery as much as running speed.
The ultra-trail calendar is concentrated in the European and North American summer. May: Transvulcania (La Palma). Late June: Western States 100 (California), Mont Blanc Marathon (Chamonix). July: Hardrock 100 (Colorado). Late August: UTMB Mont-Blanc (Chamonix). September: Tor des Géants (Aosta Valley), Dragon's Back Race (Wales). April: Marathon des Sables (Moroccan Sahara).
Qualification and training must work back from these dates. UTMB World Series qualifying races run throughout the year; most runners target a qualifying race 6–12 months before their goal event. Marathon des Sables registration opens well in advance and places fill months ahead. Always check the official race website for confirmed dates — we display the established recurring pattern and flag honestly when the next edition date has not been officially announced.
Ultra-trail training combines running volume, vertical gain and time-on-feet. For a 100 km race, expect 12–16 weeks of specific training with weekly long runs, regular vertical (1,000–3,000 m of climb per week), and back-to-back long days to build fatigue resistance. For a 100-miler, allow 16–24 weeks. Test your nutrition, hydration and gear in long training runs — race-day fueling is a skill, not an afterthought.
For multi-stage self-sufficient races (Marathon des Sables), add heat acclimatisation, multi-day back-to-back long runs, and a full rehearsal of your pack, food and daily routine. Foot care is a defining skill — many withdrawals are foot-related. For high-altitude races (Hardrock, UTMB), arrive early to acclimatise if you live at low elevation.
Every ultra-trail enforces a mandatory kit list: waterproof jacket, headlamp, survival blanket, whistle, minimum water and food, and often a bandage and self-adhesive tape. Mountain races (UTMB, Tor, Hardrock) require more — full waterproofs, warm layers, a second headlamp. Kit checks are enforced at registration; missing kit means no start.
Many races require a medical certificate and ECG (Tor des Géants, Marathon des Sables, UTMB for some nationalities). Arrange these with your doctor well before the race — they cannot be done at the last minute. Carry your own insurance that covers mountain rescue in the race country.