TRAIL NATURA SIOULE - 53 KM 2027
The forecast arrives five days before the start.
Here you'll find the elevation profile, an estimated finish time based on your UTMB Index and details of the 5 aid stations to plan your nutrition and hydration segment by segment.
What's your time based on your UTMB?
Times estimated by the RAVIT model, learned from real ultra-trail finish times. Enter your UTMB Index (utmb.world) to get a personalized estimate.
Cut-off times and crew - TRAIL NATURA SIOULE - 53 KM · 2027
Data from the official race rules, checked for every edition. The race rules prevail. Positions are interpolated along the GPX track and are a guide, not official course marking.
What you'll find at each aid station
| Product | km 8.8km 8.8 | km 20.7km 20.7 | km 33km 33.0 | km 47.2km 47.2 | Arrivéekm 53.4 |
|---|---|---|---|---|---|
| Water | available | available | available | available | available |
| Brand products | available | available | available | available | available |
La feuille de ton assistance pour TRAIL NATURA SIOULE - 53 KM · 2027
Les règles d'assistance de cette course ne sont pas encore connues : tu marqueras tes rendez-vous toi-même.
Recto, verso et planche d'étiquettes, en PDF : l'exemple d'une coureuse de l'UTMB.
Elevation profile
The course and its aid stations
TRAIL NATURA SIOULE - 53 KM: times, aid-station stops and fuelling needs by UTMB® Index
Between a UTMB® Index of 500 and 800, the estimated finish time on this race runs from 7h48 to 4h43, and the aid-station stop budget from 0h17 to 0h06. The longer the race, the more stops weigh: this is time you should plan to spend standing still, not only running.
Source
Below a UTMB® Index of roughly 390, the overall cut-off of 10h00 is no longer reachable at the estimated pace.
| UTMB® Index | Estimated time | Of which stops | Night hours | Carbs | Fluid | Sodium | Cut-off margin |
|---|---|---|---|---|---|---|---|
| 500 | 7h48 | 0h17 | — | 468 g | 5.5 L | 3,904 mg | +2h12 |
| 550 | 7h08 | 0h14 | — | 428 g | 5 L | 3,570 mg | +2h52 |
| 600 | 6h33 | 0h11 | — | 393 g | 4.6 L | 3,271 mg | +3h27 |
| 650 | 6h02 | 0h10 | — | 362 g | 4.2 L | 3,018 mg | +3h58 |
| 700 | 5h29 | 0h08 | — | 329 g | 3.8 L | 2,739 mg | +4h31 |
| 750 | 5h05 | 0h07 | — | 305 g | 3.6 L | 2,538 mg | +4h55 |
| 800 | 4h43 | 0h06 | — | 283 g | 3.3 L | 2,357 mg | +5h17 |
Figures based on 60 g of carbohydrate, 700 mL of fluid and 500 mg of sodium per hour, "average" preparation and mild conditions (15–25 °C). Above 25 °C, count on roughly 900 mL/h and 700 mg/h. Carbohydrate intake is trained: 60 g/h is a floor, 90 g/h assumes a glucose-fructose blend and a gut used to it.
In the 2027 ranking
TRAIL NATURA SIOULE - 53 KM is 53 km and 2,130 m of elevation gain, that's 74 km-effort: category S, among 163 races in 2027. Its time limit of 10 h requires a minimum speed of 5.3 km/h: rank 115 out of 145 of the widest cut-off times in S.
S trails 2027: 45 to 74 km-effort
Similar effort in 2027
- Malaysia Ultra-Trail - MALAYSIA50 · 74 km-effort
- Stoos-Trail - ST46 · 74 km-effort
- Trail du Saint Jacques - 50K - Monistrail · 74 km-effort
Other trails worth preparing for
- Moontrail by RCBJ - Tour du plateau36 km · 1,081 m D+ · October 31, 2026
- Eco Valet'Trail - 34 Km34 km · 1,454 m D+ · November 1, 2026
- Urban Trail des 3 Panoramas de Rouen - UT3PR 72 KM71 km · 1,438 m D+ · November 1, 2026
- Moulidars - 41km41 km · 1,100 m D+ · November 1, 2026
- Urban Trail des 3 Panoramas de Rouen - UT3PR 42,2 KM MARATRAIL42 km · 1,082 m D+ · November 1, 2026
- Liévin - 36km-night35 km · 594 m D+ · November 7, 2026
- Trail du Lac de Villerest - Le Tour du Lac42 km · 1,196 m D+ · November 7, 2026
- Veni Vici 52k53 km · 1,286 m D+ · November 7, 2026
- Liévin - 61km-night60 km · 952 m D+ · November 7, 2026
Sources and method
- Time projection — times by UTMB Index are taken from the actual splits of runners in each level band on previous editions of this race, aid station stops included. No formula is used as long as these results exist.
- Trail nutrition — hourly targets for carbohydrate, fluid and sodium follow the commonly accepted ultra-endurance guidance. La Clinique du Coureur — Fuelling in trail running
- Course, aid stations and cut-offs — taken from the event's official rules, which prevail in case of any discrepancy. Official site — TRAIL NATURA SIOULE - 53 KM
Weather for TRAIL NATURA SIOULE - 53 KM
The weather for TRAIL NATURA SIOULE - 53 KM will appear here as soon as the forecast models reach that date, around five days before the start: feels-like temperature, rain, snow, wind and storms, section by section and at your passage time.
Detailed weather for TRAIL NATURA SIOULE - 53 KM, hour by hour on the courseFrequently asked questions
How many checkpoints?
TRAIL NATURA SIOULE - 53 KM has 5 checkpoints: 5 aid stations. Details are in the two tables above.
What's the longest segment without aid?
The one leading to Ravitaillement km 47.2: 14.1 km and 452 m elevation gain. That's the one to load up for first.
How do I find the exact location of an aid station?
The Google Maps icon in the “Access” column opens the aid station's location: handy for planning your crew's routes.
What distance and elevation gain?
TRAIL NATURA SIOULE - 53 KM is 53 km long with 2130 m of elevation gain.
How long to finish?
With a UTMB Index of 600 (average runner), the estimated time is around 6h33 for TRAIL NATURA SIOULE - 53 KM.
What's the weather forecast?
The weather for TRAIL NATURA SIOULE - 53 KM will be published on this page around five days before the start, once the forecast models reach the race date. It will be detailed section by section: feels-like temperature, rain, snow, wind and storms.
Want to stack the odds in your favor for TRAIL NATURA SIOULE - 53 KM?
In 2 minutes, RAVIT generates your complete plan: segment-by-segment time, carbs, water and sodium at every aid station, printable roadbook.
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