Transju'Trail
The major trail running event in the Jura Mountains — 11 races from 5 to 110 km
About Transju'Trail
La Transju'Trails is the major trail running event in the Jura Mountains, organized every year in June by the La Transju' association (the summer version of the legendary Transjurassienne, a Nordic ski race). The event mainly takes place in Les Rousses and Lamoura (Haut-Jura, 39), with starts and finishes distributed between Les Rousses, Morbier, Les Tuffes, and Prémanon depending on the format.
The weekend offers 11 events covering all runner profiles: a 110 km ultra, trails of 82 km (with relay option), 65 km, 42 km, 25 km, 15 km, 10 km, and 5 km, two hiking trails of 5 and 15 km, as well as children's races. A Transju' Vertical event (a pure uphill race) is also organized prior to the main weekend.
More than 6,500 participants are expected in 2026, making Transju'Trails one of the largest trail gatherings in the Bourgogne-Franche-Comté region. The event attracts runners from all over France, Switzerland, and Europe, drawn by the quality of the Franco-Swiss routes and the preserved landscapes of the Jura massif (Lakes of Les Rousses, Risoux forest, La Dôle, Mont Noir, viaducts of the Hirondelles line).
La Transju'Trails: trail running in the heart of the Haut-Jura
The summer version of the legendary Transjurassienne (a long-distance Nordic ski race), La Transju'Trails is the benchmark trail running event in the Jura Mountains. Organized annually in early June by the La Transju' association (based in Hauts-de-Bienne, 39), the event brings together over 6,500 runners for a full weekend of races, hikes, and activities between Les Rousses, Lamoura, Morbier, Prémanon, and Les Tuffes.
11 events for all profiles
The 2026 format offers an exceptionally comprehensive range of events, from the 5 km discovery course to the 110 km ultra-trail:
- Ultra 110 km — the flagship event for seasoned ultra-trailers
- Trail 82 km — a Franco-Swiss course with 3,740 m of positive elevation gain, reserved for experienced trail runners
- Relay 82 km — the same loop as a team
- Trail 65 km — Franco-Swiss loop with 2,870 m of D+ (limited places)
- Trail 42 km — marathon trail format, 2,200 m of D+, start Morbier → finish Les Rousses
- Trail 25 km — 1,260 m of D+, passing through Prémanon and the summit of La Dôle
- Trail 15 km — start Jason Lamy Chappuis stadium (Les Tuffes / Prémanon) → finish Les Rousses
- Trail 10 km — 350 m of D+, loop around Les Rousses
- Trail / Walk 5 km — discovery format, 80 m of D+, around the Fort des Rousses
- Hiking 15 km — walking route
- Children's races (Youth Trail) — for the youngest
A complementary Transju' Vertical event (a pure uphill race, 2.35 km) is organized on Friday, May 29, 2026, prior to the main weekend.
Franco-Swiss routes between lakes, forests, and summits
The routes crisscross the Haut-Jura and extend into the canton of Vaud on the Swiss side. Runners pass through exceptional landscapes: Lakes of Les Rousses, Bellefontaine, and Les Mortes, Risoux forest, summit of La Dôle (second highest peak in the region), ascent of Mont Noir with panoramic views of Lake Geneva and the Mont-Blanc range on clear days, viaducts of the Hirondelles line, Creux du Croue, Roche Champion. The trails alternate technical singletracks, forest sections, and high-altitude passages — including a monkey bridge at Trou Bleu on the 42 km course.
A festive event throughout the weekend
Beyond the races, La Transju'Trails is a truly festive gathering that enlivens the Jura Mountains region for an entire weekend. The Trail Show in Les Rousses (Halle de l'Omnibus) hosts bib collection, partner stands (equipment manufacturers, trail brands, institutional partners), local food, and entertainment. The atmosphere is warm and family-friendly, in the mountain spirit of the Haut-Jura.
Continuous growth
With 6,500 participants expected in 2026 (compared to 5,000 in 2025) and the expansion of the range to 11 events (including the new 110 km, 82 km, and 65 km formats), La Transju'Trails confirms its status as a benchmark trail running event in Bourgogne-Franche-Comté. The event is organized by the La Transju' association, which also organizes the Transjurassienne Nordic ski race in February and several cycling races in the Jura massif.
Transju'Trail — edition 2026
The Transju'Trails 2026 (19th edition) takes place on Saturday, June 6 and Sunday, June 7, 2026 in the Montagnes du Jura. This edition offers 11 events, from the 110 km ultra-trail to the 5 km discovery format, with two major new features compared to 2025: a 110 km ultra-trail and a 65 km intermediate format. More than 6,500 participants are expected.
2026 Edition: 19th Edition and New 110 km Format
The Transju'Trails 2026 marks the 19th edition of the event and takes place over two days, Saturday, June 6 (long-distance events) and Sunday, June 7 (intermediate events and short formats). More than 6,500 participants are expected, compared to 5,000 in 2025.
The main new features for 2026 are:
- A 110 km ultra-trail, the new flagship event
- An 82 km Trail (with team relay option)
- A 65 km Trail (limited places) in addition to the existing 42 km
- A complementary Transju' Vertical event (2.35 km uphill climb) organized on Friday, May 29, 2026
The main hub for the weekend is Les Rousses (Halle de l'Omnibus for the Trail Show and bib collection), with staggered starts in Morbier (42 km) and at the Jason Lamy Chappuis stadium in Les Tuffes/Prémanon (15 km). The long-distance routes are Franco-Swiss: Mont Noir, Creux du Croue, Risoux forest, summit of La Dôle, Les Rousses lakes, Bellefontaine and Mortes.
Programme Transju'Trail 2026
Friday, May 29, 2026 — Transju' Vertical (complementary event)
- Transju' Vertical — 2.35 km uphill climb
Saturday, June 6, 2026 — Long-distance events
- 03:00 AM — Ultra 110 km · Les Rousses → Les Rousses (new for 2026)
- 05:00 AM — Trail 82 km · 3,740 m D+ · Franco-Swiss route · Les Rousses → Les Rousses · reserved for experienced trail runners
- 06:00 AM — 82 km Relay · same route as the 82 km, in teams
- 06:00 AM — Trail 65 km · 2,870 m D+ · Franco-Swiss loop · Les Rousses → Les Rousses · limited places (new for 2026)
- 11:00 AM — Trail 42 km · 2,200 m D+ · Morbier (Stade des Marais) → Les Rousses · ascent of La Dôle, monkey bridge at Trou Bleu
- All day — Youth Trail · children's races
Sunday, June 7, 2026 — Intermediate events and short formats
- 08:00 AM — Trail 25 km · 1,260 m D+ · Les Rousses → Les Rousses · passing through Prémanon and the summit of La Dôle
- 08:30 AM — 15 km Hike · walking route
- 09:15 AM — Trail 15 km · 870 m D+ · Les Tuffes (Jason Lamy Chappuis stadium, Prémanon) → Les Rousses
- 11:00 AM — Trail 10 km · 350 m D+ · Les Rousses loop
- 12:00 PM — Trail / Walk 5 km · 80 m D+ · loop around Fort des Rousses
Highlights Transju'Trail 2026
- 19th edition on Saturday, June 6 and Sunday, June 7, 2026, in the Montagnes du Jura
- Three new features for 2026: 110 km ultra, 82 km trail, and 65 km trail — the range expands from 5 to 11 events
- More than 6,500 participants expected (compared to 5,000 in 2025)
- Franco-Swiss routes: Risoux forest, summit of La Dôle, Les Rousses lakes, Mont Noir, viaducts of the Ligne des Hirondelles
- Decreasing prices: up to −50% for early registration (before March 29, 2026)
- Trail Show at the Halle de l'Omnibus (Les Rousses) all weekend
Prices Transju'Trail 2026
Practical information — Transju'Trail
Practical Information
2026 Dates
The Transju'Trails 2026 (19th edition) takes place on Saturday, June 6 and Sunday, June 7, 2026. A complementary Transju' Vertical event is organized on Friday, May 29, 2026.
Locations
- Les Rousses (39220) — main hub: Trail Show at the Halle de l'Omnibus, bib collection, starts and finishes of most events (5, 10, 25, 65, 82, 110 km)
- Morbier — Stade des Marais — start of the 42 km Trail
- Les Tuffes / Prémanon — Stade Jason Lamy Chappuis — start of the 15 km Trail
- Lamoura (39310) — commune of Hauts-de-Bienne, accommodation and access to the massif
Bib collection (Halle de l'Omnibus, Les Rousses)
- Friday, June 5, 2026: 2 PM - 8 PM
- Saturday, June 6, 2026: 4 AM - 6 AM then 11 AM - 7 PM
- Sunday, June 7, 2026: 6:30 AM - 11:30 AM
Mandatory documents: valid official ID, registration confirmation (or QR code), sports license or medical certificate.
Registration
Registration open on the official website latransju.com. Decreasing rates depending on the registration date (until March 29, 2026: preferential rate -33% to -50% depending on the format). Group rates: -10% for 10 or more registrants, -15% for 15 or more registrants. Limited places on certain formats (especially the 65 km).
Access
- By car: Les Rousses is accessible from Lons-le-Saunier (~60 km via the N78 then the D25), from Geneva (~50 km via La Cure) or from Saint-Claude (~25 km). Organized parking at Les Gentianes (Morbier), at the central parking / tennis / Champs de Neige (Les Rousses) and at the lower parking / Balancier (Les Tuffes).
- By train: Frasne TGV station or Morez TER station, then shuttle or taxi.
- Airport: Geneva about 1 hour away.
Accommodation
Numerous accommodations (hotels, gîtes, furnished rentals, campsites, Airbnb) are available in Les Rousses, Lamoura, Prémanon, Bois d'Amont, and Morez. Very early booking recommended — the weekend brings together over 6,500 runners and their companions. See the tourist offices of Les Rousses and Haut-Jura.
Contact
Association La Transju'
18 avenue Charles de Gaulle, 39400 Hauts-de-Bienne
Tel.: 03 84 33 45 13
Email: [email protected]
Website: latransju.com
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