France · Île-de-France
Distance
84 km
Date
Entry fee
€145
€ / km
€1.73
EcoTrail Paris 84km is one of the flattest ultramarathons in Europe — ranked 366th most mountainous out of 390 European trail races, with just 1,300m of ascent over its 84km point-to-point route from Château de Rambouillet to the foot of the Eiffel Tower. Starting in the royal grounds of Rambouillet and winding through the forests and hillsides of the Chevreuse Valley, 95% of the course runs on natural terrain before delivering runners into the heart of Paris for an iconic Trocadéro finish.
The biggest single climb rises just 83m; the biggest descent drops just 93m at an average gradient of −2.4%. This is a race defined by distance, not elevation — ideal for road-to-trail runners making the ultra leap, or anyone who wants the EcoTrail Paris experience without the 2,000m+ of gain the 122km demands. Sold out for 2026, with entry at €140 (€1.67/km). First held in 2008, it has been the gateway race of the Île-de-France trail scene ever since.
Total Meters
1,300m
D+/KM
15.5m/km
For context, the Tor des Géants 330 loop has 73 D+/km.
Avg Uphill Gradient
6.9%
Avg Downhill Gradient
-6.7%
| 2–5% | 7.1 km | |
|---|---|---|
| 5–10% | 4.3 km | |
| 10–15% | 2.2 km | |
| 15–20% | 0.9 km | |
| 20%+ | 0.3 km |
| 17.8% | Uphill |
|---|---|
| 61.7% | Flat |
| 20.6% | Downhill |
| 1 | 2.0 km · 93 m gain starts km 59 · avg 4.7% · max 24.9% |
|---|---|
| 2 | 2.8 km · 72 m gain starts km 37 · avg 2.5% · max 14.1% |
| 3 | 1.4 km · 64 m gain starts km 30 · avg 4.4% · max 14.7% |
| 1 | 1.1 km · 93 m drop starts km 58 · avg -8.8% · max -15.7% |
|---|---|
| 2 | 3.5 km · 83 m drop starts km 68 · avg -2.4% · max -12.0% |
| 3 | 0.9 km · 72 m drop starts km 36 · avg -8.0% · max -20.4% |
Yes — the 2026 edition sold out and registrations are closed, though a waitlist is available via the official site. Entry for 2026 was €140 (€1.67/km). New slots may open if the organiser releases additional places for future editions.
Approximately 1,300m of D+ over 84km, giving a D+/km ratio of around 15.5m/km — one of the lowest in European ultra trail running. It ranks 355th most vertical out of 390 courses in the DiscoverTrailRaces database.
The race starts at Château de Rambouillet and finishes at Pont d'Iéna at the foot of the Eiffel Tower in Paris, running point-to-point through the forests and valleys of western Île-de-France including the Chevreuse Valley.
It ranks 366th most mountainous out of 390 European trail races — meaning only 24 are flatter in the DiscoverTrailRaces database. The biggest single climb is just 83m, the biggest descent drops only 93m, and average descent gradient is the 44th gentlest in the database. This is extremely runnable terrain, well-suited to road runners transitioning to ultra distances.
Rambouillet is accessible by RER C train from central Paris in approximately 1 hour. The finish at the Eiffel Tower is in the heart of Paris, making EcoTrail Paris one of the most logistics-friendly ultras in Europe for international runners.
Nearest airport
Paris CDG (CDG) / Paris Orly (ORY)
Notes
Start: <1 hr / Public transport: Excellent (metro/RER)
Ibiza Trail Maratón 48 km
Exclusive Discount - use ITMF-DISCOVERTRAIL26 CODE for 50% at checkout
