Segly has pre-computed a strategy for every race format. Customize it to your level and start with a plan built around the official aid stations.
The flagship race. 180 km and 10,200 m D+ across the entire island of Réunion, from Saint-Philippe to Saint-Denis. France's most grueling ultra trail.
Analyze with Segly →106 km and 6,200 m D+. A demanding ultra trail through the wild landscapes of Réunion Island.
Analyze with Segly →74 km and 3,800 m D+ on Réunion Island. A committed long trail on the island's iconic paths.
Analyze with Segly →51 km and 2,500 m D+. An accessible trail to discover the paths of Réunion as part of the Grand Raid.
Analyze with Segly →160 km and 8,460 m D+ as a relay with a team of four. Start in front of Saint-Joseph's town hall on Thursday Oct 15 at 17h. 4 legs: 37 + 35 + 49 + 39 km.
Analyze with Segly →The Templiers ultra. 99.5 km and 4,304 m D+ across the Grands Causses. Start Friday Oct 16 at 04h00.
Analyze with Segly →The founding Templiers race. 80.7 km and 3,443 m D+ on the Causses — the race that invented trail running in France.
Analyze with Segly →62 km and 2,695 m D+ across the Aveyron causses. Intermediate format between marathon and ultra.
Analyze with Segly →The Causses trail marathon. ~35 km and 1,578 m D+ on the limestone paths of the Aveyron gorges.
Analyze with Segly →48.3 km and 1,813 m D+ on the Aveyron causses. A challenging trail at the heart of the Templiers festival.
Analyze with Segly →48.5 km and 2,224 m D+ on the Aveyron causses. A technical and demanding trail at the Templiers programme.
Analyze with Segly →The flagship distance of La Veni Vici. 87 km from Uzès via the Pont du Gard to Nîmes through the ancient landscapes of the Gard.
Analyse with Segly →52 km from the Pont du Gard to Nîmes. A semi-ultra starting from the most iconic Roman monument in the Gard.
Analyse with Segly →33 km from Uzès to the Pont du Gard. Accessible trail through garrigue, vineyards and ancient Roman heritage.
Analyse with Segly →18 km loop around the Pont du Gard. A discovery distance at the heart of the UNESCO-listed Roman heritage site.
Analyse with Segly →The Lyon ↔ Saint-Étienne return ultra. 160 km, rankings based on the return leg. Start Lyon on Saturday Nov 28 at 9h.
The flagship race — 80 km by night from Saint-Étienne to Lyon. 8,000 runners expected. Start Sat Nov 28 at 23h30.
Same course as the Solo run as a relay. Multiple relay formats to tackle the SaintéLyon as a team.
Intermediate SaintéLyon format. 44 km from Sainte-Catherine to Lyon on the night of Nov 28-29.
24 km night run from Soucieu-en-Jarrest. A short format to experience the unique SaintéLyon atmosphere.
The gateway to the SaintéLyon. 13 km from Chaponost to discover France's most iconic night race.
Find Segly analyses from previous editions — plans remain accessible to train or prepare for the next edition.
The extreme GRF event. ~300 km without markings as a relay or solo. Full GPS navigation — start on 17 September at midnight.
166 km of GPS navigation along the Breton coastline. Solo or relay of 2 or 4. Start on 18 September at midnight.
Analyse with Segly →GRF's intermediate distance. 92 km along the Crozon Peninsula coastline, between cliffs and pine forests.
Analyse with Segly →GRF's accessible distance. 54-56 km along the coastal paths of the Crozon Peninsula.
Analyse with Segly →GRF's discovery distance. 18 km to get started with GPS navigation on the Crozon Peninsula.
Analyse with Segly →The flagship distance of the Nice metropolis. 165 km and 8,900m D+ between sea and mountains, finishing on the Promenade des Anglais.
Analyse with Segly →109 km from Roubion to Nice. A demanding 100K through the Alpes-Maritimes finishing on the Côte d'Azur.
Analyse with Segly →39 km from Levens to Nice. An accessible distance to discover the trails of the Nice hinterland.
Analyse with Segly →50 km from Eze to Nice. Panoramic views over the Mediterranean and ridgeline trails in the Alpes-Maritimes.
Analyse with Segly →23 km from Saint-Jean-Cap-Ferrat. The discovery distance of race week, with a spectacular seaside finish in Nice.
Analyse with Segly →205 km and 10,000 m elevation gain through the Vosges massif — the ultimate challenge of the event.
Analyze with Segly →131 km and 6,000 m D+ in the Vosges. A demanding long ultra at the heart of the massif.
Analyze with Segly →104 km and 4,500 m D+. The 100K format of the Infernal.
Analyze with Segly →74 km and 2,850 m D+. A demanding long trail at the heart of the Vosges.
Analyze with Segly →53 km and 1,800 m D+. An accessible trail to discover the Vosges paths.
Analyze with Segly →32 km and 1,000 m D+. An accessible trail format for runners of all levels.
Analyze with Segly →16 km and 420 m D+. The discovery format of the Infernal.
Analyze with Segly →The flagship race of the Vercors. 84 km and 4,200 m D+ across the ridges and alpine meadows. Night start.
Analyze with Segly →Same course as the Ultra Solo, run as a relay team of 4.
Analyze with Segly →Intermediate format. 49 km and 2,400 m D+ across the four iconic summits of the Vercors.
Analyze with Segly →Youth format for junior runners. An introduction to the Vercors over 8-9 km and 300 m D+.
Analyze with Segly →The legendary race. Tour of Mont-Blanc across 3 countries. Start and finish in Chamonix. UTMB World Series 100M final.
Analyze with Segly →Controlled finisher plan. Passing under the time barriers at every aid station, with time to rest at both life bases and planned stops to refuel.
Analyze with Segly →The extreme self-sufficient event. 300 km, 25,000 m elevation gain. Teams of 2 or 3. No fixed route.
Analyze with Segly →Courmayeur → Chamonix via Beaufortain. Highly committing event, outside the World Series circuit.
Analyze with Segly →Courmayeur → Champex → Chamonix. UTMB World Series 100K final. Friday morning start.
Analyze with Segly →Orsières → Champex → Chamonix. UTMB World Series 50K final. Intense pace.
Analyze with Segly →Martigny-Combe → Chamonix. Accessible format to discover the UTMB atmosphere. 2026 lottery entry.
Analyze with Segly →Short and intense trail format around Chamonix. Technical course on the slopes of Mont-Blanc.
Analyze with Segly →The UTMB week youth race. A dynamic 15 km format for young runners around Chamonix.
Analyze with Segly →The legendary Montcalm race. France-Andorra crossing, sections above 3,000 m altitude. A Pyrenean legend since 1990.
Analyze with Segly →The little sister of the PicaPica. Same route over 70 km, same high-mountain Ariège spirit.
Analyze with Segly →The roof of Ariège and Catalonia. A demanding challenge taking you to the massif's finest summits.
Analyze with Segly →Discover the beautiful villages of the Ariège valley. An accessible format for a first big mountain distance.
Analyze with Segly →The discovery format of the Montcalm. Accessible Pyrenean scenery and a guaranteed friendly atmosphere.
Analyze with Segly →The flagship GRP format. 15 aid stations, 2 life bases with support crew access. Pic du Midi de Bigorre at 2,877 m.
Analyze with Segly →Cirques of Gavarnie and Estaubé. Start in Piau-Engaly. Very technical and committing.
Analyze with Segly →High-altitude lakes and the Néouvielle massif. Accessible but demanding format.
Analyze with Segly →Moudang valley. Long trail, ideal for a first big distance.
Analyze with Segly →Technical mountain trail. Rocky paths and panoramic views.
Analyze with Segly →Steep elevation over a short distance. Ideal for trail runners seeking intensity.
Analyze with Segly →The most accessible GRP format. Néouvielle massif and its mountain lakes.
Analyze with Segly →Full crossing Vizille → Aiguebelle. 15 passes, 30 mountain lakes. Solo or pair. Belledonne's ultimate challenge.
Analyze with Segly →Fond-de-France → Aiguebelle. Wild, little-traveled trails of the northern Belledonne massif.
Analyze with Segly →Allevard → Aiguebelle. Panoramic ridges and the Maurienne side. Very technical.
Analyze with Segly →Valgelon-La Rochette → Aiguebelle. All-Savoie trail route with views of Mont-Blanc.
Analyze with Segly →Fond-de-France loop. Ascent of the Rocher Blanc at 2,928 m. Intense skyrunning format.
Analyze with Segly →Big mountain trails share extremely variable profiles — large temperature swings, high-altitude sections, night segments, spaced-out aid stations. These are exactly the conditions where a precise race plan makes all the difference.
Segly splits your track at each format's official aid stations, calculates your passage times based on your actual level, and shows the forecast weather segment by segment up to 10 days before the start. Sodium, water, carbs and clothing are then automatically adjusted based on each section's conditions.
Each "Analyze with Segly" link opens a pre-configured analysis with the race's official split at the aid stations, a fatigue factor set to 15% (the standard for top ultra-trail runners) and a reference time based on an average runner.
You just need to enter your own level (ITRA, UTMB Index or Be Trail) to get a personalized estimate. You can also adjust the fatigue factor to match your strategy — a more cautious start (negative FF) or a dynamic start (positive FF).
This page is updated regularly with new trail and ultra-trail events. Races are added as the calendar unfolds — each time with the official aid-station split and a pre-computed analysis ready to customize.
Running an event that isn't listed yet? You can import your own GPX track and build your personalized analysis from scratch in minutes.
Import your own GPX track and create your personalized analysis in minutes.
Analyze my GPX track →
SEGLY