Altigraph · Race profiles · Salomon EcoTrail Paris, 20 km trail 2027
Salomon EcoTrail Paris, 20 km trail 2027: elevation profile, climbs and gradients
Trail from Saint-Cloud to Meudon on 21 March 2027: 21.8 km with 531 m of climbing and 406 m of descent, according to the course published by the organiser. Here is where it climbs, how steep, and where the race is decided.
The profile
The three numbers to read first
- 24.2 metres climbed per km. Hilly course: the climbs decide the race, hold an even effort.
- Where the climbing sits. 10 climbs in all. The biggest runs from km 8.4 to km 9.5: 1.08 km at +8.5 % on average (+92 m, peak +16.0 %). The last real climb tops out at km 21.7, 0.28 km from the finish: that is where you can finally commit. The climbing is spread along the course: a steady effort from start to finish is the plan.
- The steepest 100 m. The steepest 100 m are at km 19.8, at +17.3 %: steep enough that a brisk walk may be as fast as a run there.
Open this course in Altigraph. The interactive version: hover the profile, see the map coloured by gradient, download or share the image.
The sections that matter
Sections longer than 200 m at 2 % or more, or with at least 10 m of elevation change. Everything else is flat or false flat. Max = the steepest 100 m of the section.
| Where | What | Length | Altitude | Avg | Max |
|---|---|---|---|---|---|
| km 0.8 → 2.131 → 104 m | climb | 1,340 m | 31 → 104 m | +5.4 % | +12.1 % |
| km 2.5 → 3.5101 → 131 m | climb | 1,000 m | 101 → 131 m | +3.0 % | +5.5 % |
| km 3.7 → 4.6124 → 144 m | climb | 860 m | 124 → 144 m | +2.3 % | +7.2 % |
| km 5.3 → 6.3140 → 165 m | climb | 1,010 m | 140 → 165 m | +2.4 % | +10.2 % |
| km 6.3 → 7.1164 → 122 m | descent | 710 m | 164 → 122 m | -6.0 % | -16.5 % |
| km 7.1 → 7.5122 → 154 m | climb | 400 m | 122 → 154 m | +8.1 % | +11.6 % |
| km 7.5 → 8.4154 → 76 m | descent | 900 m | 154 → 76 m | -8.7 % | -17.4 % |
| km 8.4 → 9.576 → 168 m | climb | 1,080 m | 76 → 168 m | +8.5 % | +16.0 % |
| km 9.5 → 9.9168 → 110 m | descent | 470 m | 168 → 110 m | -12.3 % | -18.0 % |
| km 10.0 → 10.5111 → 142 m | climb | 540 m | 111 → 142 m | +5.8 % | +12.2 % |
| km 10.5 → 11.2142 → 118 m | descent | 680 m | 142 → 118 m | -3.5 % | -8.0 % |
| km 11.6 → 11.9120 → 132 m | climb | 290 m | 120 → 132 m | +4.3 % | +6.7 % |
| km 12.9 → 13.8132 → 105 m | descent | 910 m | 132 → 105 m | -3.0 % | -7.2 % |
| km 14.0 → 14.7105 → 136 m | climb | 670 m | 105 → 136 m | +4.7 % | +11.8 % |
| km 14.7 → 14.9136 → 127 m | descent | 210 m | 136 → 127 m | -4.2 % | -6.7 % |
| km 14.9 → 16.2127 → 176 m | climb | 1,330 m | 127 → 176 m | +3.7 % | +9.4 % |
| km 18.5 → 19.0175 → 162 m | descent | 450 m | 175 → 162 m | -3.0 % | -5.3 % |
| km 19.6 → 20.2165 → 131 m | descent | 650 m | 165 → 131 m | -5.2 % | +17.3 % |
| km 20.4 → 20.9133 → 115 m | descent | 550 m | 133 → 115 m | -3.3 % | -5.0 % |
| km 20.9 → 21.7115 → 154 m | climb | 750 m | 115 → 154 m | +5.2 % | +12.3 % |
The steepest stretches
-18.0 % · at km 9.6steepest descent over 100 m
-15.2 % · at km 9.6steepest descent over 250 m
-11.6 % · at km 9.4steepest descent over 500 m
-7.6 % · at km 7.4steepest descent over 1000 m
Where the numbers come from
The course is the public Strava route published by the organiser (« Salomon EcoTrail Paris Printemps 2027 - Trail 20km... »), read without an account through its public embed. Altigraph shows the computed profile and links to the original route; the track itself is not redistributed.
The organiser quotes 550 m of climbing; Altigraph computes 531 m after smoothing the altitude over 50 m, which removes GPS jitter (3 % less here). Adding up every rise of the same track without any smoothing gives 604 m: that raw sum is usually the figure race brochures quote. Both figures describe the same course: the smoothed one is the better estimate of what your legs will feel, the raw one counts every bump. The organiser's figure.
Method: the track is resampled every 10 m, altitude is smoothed over 50 m either side, the local gradient is measured over 100 m, then the course is cut into climbs (over 1.5 %), descents (under -1.5 %) and flat parts. The thresholds are the same as on the home page.
Open this course in Altigraph. The interactive version: hover the profile, see the map coloured by gradient, download or share the image.
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Profile computed on 21 September 2026 from the organiser's course. A course can change until race day: the organiser's page is the reference.