The Diagonale des Yvelines returns on Saturday, April 18, 2026, offering a unique traverse of the Yvelines department. This event challenges runners to navigate the diverse landscapes of the region, starting from various historical and natural landmarks and converging at a single finish line in the picturesque village of Rochefort-en-Yvelines. As a key stage of the Challenge Natura Trail 2025–2026, it attracts both endurance specialists and nature lovers looking to discover the hidden trails of the Île-de-France.
| Race Name | Distance (Approx.) | Start Location | Key Landmark |
|---|---|---|---|
| L'Ultra Diagonale | 80 km – 100 km | Breuil-Bois-Robert | Full North-to-South traverse |
| La Diagonale | 50 km | Château de Béhoust | Historic castle start |
| Le Trail des Étangs | 20 km – 30 km | Étangs de Hollande | Natural water reserve scenery |
| Le Petit Trail | 12 km | Rochefort-en-Yvelines | Local loop around the finish village |
Course Experience and Regulations
The 2026 edition emphasizes self-sufficiency and respect for the natural environment. While aid stations are provided at specific intervals, runners on the longer distances are expected to carry mandatory safety gear, including a survival blanket, a mobile phone, and a minimum water supply. The finish line in Rochefort-en-Yvelines serves as the central hub for the event, featuring a festive atmosphere, live tracking (Suivi Live), and the final awards ceremony. For those competing in the Challenge Natura Trail, this race provides critical points toward the 2025–2026 provisional rankings.
Logistics and Registration
Registration is managed online, and participants are encouraged to consult the 2026 Official Regulations for specific medical certification requirements or the Parcours Prévention Santé (PPS) protocols. Shuttle services are typically organized to transport runners from the finish area in Rochefort-en-Yvelines to the various starting points (Breuil-Bois-Robert, Béhoust, etc.) on the morning of the race. Bib collection times and specific shuttle schedules are detailed in the "Infos Pratiques" section of the official website. Results, along with photos and videos of the traverse, will be made available shortly after the conclusion of the event.
Apr 18, 2026
Distance — 100K
Type — Running
06:00
€90.00
Apr 18, 2026
Distance — 12K
Type — Running
10:30
€18.00
Apr 18, 2026
Distance — 20K
Type — Running
10:30
€25.00
Apr 18, 2026
Distance — 50K
Type — Running
13:00
€50.00
These values represent the 3-year monthly averages for April in Breuil-Bois-Robert.
Learn more about the host city, Breuil-Bois-Robert.
Breuil-Bois-Robert is a commune in the Yvelines department in the Île-de-France region in north-central France.
Read more launchWatch highlights and course previews from previous years.
Explore other exciting events happening in this same region.
location_on Rambouillet, Centre-Val de Loire, FR
calendar_today Mar 29, 2026
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