Trail du Saint Jacques - 100K - Grand Trail du Saint Jacques 2026
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 8 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.
Predicted race time based on your UTMB Index® · smoothed times achieved by runners at your level in past editions
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Cut-off times and crew - Trail du Saint Jacques - 100K - Grand Trail du Saint Jacques · 2026
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 | Saint Privat d'Allierkm 11.3 | Saint Jean Lachalmkm 20.2 | Alleyraskm 32.1 | Lac du Bouchetkm 48.2 | Bainskm 64.0 | Saint Christophe sur Dolaizonkm 70.8 | Les Chibotteskm 81.0 | Le Puy-en-Velaykm 86.6 |
|---|---|---|---|---|---|---|---|---|
| Water | available | available | available | available | available | available | available | available |
| Brand products | available | unavailable | unavailable | unavailable | unavailable | unavailable | unavailable | unavailable |
| Brand products · Näak | unavailable | available | available | unavailable | unavailable | available | available | available |
| Hot meal | unavailable | unavailable | unavailable | available | unavailable | unavailable | unavailable | unavailable |
Elevation profile
The course and its aid stations
Trail du Saint Jacques - 100K - Grand Trail du Saint Jacques: 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 14h36 to 8h34. These times include aid-station stops: they come from real durations between two timing points, and this race's timing does not measure stops separately.
SourceBelow a UTMB® Index of roughly 335, the overall cut-off of 18h00 is no longer reachable at the estimated pace.
| UTMB® Index | Estimated time | Night hours | Carbs | Fluid | Sodium | Cut-off margin |
|---|---|---|---|---|---|---|
| 500 | 14h36 | 1.3 | 876 g | 10.2 L | 7,300 mg | +3h24 |
| 550 | 13h17 | — | 797 g | 9.3 L | 6,642 mg | +4h43 |
| 600 | 12h16 | — | 736 g | 8.6 L | 6,133 mg | +5h44 |
| 650 | 11h14 | — | 674 g | 7.9 L | 5,617 mg | +6h46 |
| 700 | 10h20 | — | 620 g | 7.2 L | 5,167 mg | +7h40 |
| 750 | 9h17 | — | 557 g | 6.5 L | 4,642 mg | +8h43 |
| 800 | 8h34 | — | 514 g | 6 L | 4,283 mg | +9h26 |
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.
Measured on the 2026 edition: the field checkpoint by checkpoint
1,410 starters, 17.2% DNF rate, 8 timed checkpoints.
| Segment | km | Median | Middle half | Measured |
|---|---|---|---|---|
| Monsitrol d'Allier → Saint-Privat d'Allier | 11.3 | 1 h 25 | 1 h 17 – 1 h 32 | 1,398 |
| Saint-Privat d'Allier → Saint Jean Lachalm | 20.2 | 1 h 39 | 1 h 28 – 1 h 49 | 1,395 |
| Saint Jean Lachalm → Alleyras | 32.1 | 1 h 58 | 1 h 44 – 2 h 14 | 1,372 |
| Alleyras → Lac du Bouchet | 48.1 | 2 h 48 | 2 h 27 – 3 h 09 | 1,291 |
| Lac du Bouchet → Saint-Christophe-sur-Dolaizon | 70.7 | 3 h 52 | 3 h 23 – 4 h 19 | 1,158 |
| Saint-Christophe-sur-Dolaizon → Pont de la Roche | 74 | 36 min | 31 min – 44 min | 1,137 |
| Pont de la Roche → Les Chibottes | 81 | 1 h 09 | 1 h 02 – 1 h 21 | 1,155 |
| Les Chibottes → Le-Puy-en-Velay | 86.6 | 52 min | 45 min – 1 h 01 | 1,167 |
Where runners drop out. Lac du Bouchet (106) · Alleyras (80) · Saint Jean Lachalm (32) out of 242 total DNFs.
RAVIT record from the official timing of the 2026 edition, data from September 14, 2026.
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Trail du Saint Jacques - 100K - Grand Trail du Saint Jacques over the years
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 du Saint Jacques - 100K - Grand Trail du Saint Jacques
Weather for Trail du Saint Jacques - 100K - Grand Trail du Saint Jacques
The weather for Trail du Saint Jacques - 100K - Grand Trail du Saint Jacques 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 du Saint Jacques - 100K - Grand Trail du Saint Jacques, hour by hour on the courseFrequently asked questions
How many checkpoints?
Trail du Saint Jacques - 100K - Grand Trail du Saint Jacques has 8 checkpoints: 7 aid stations and 1 water point. Details are in the two tables above.
What's the longest segment without aid?
The one leading to Lac du Bouchet: 16.0 km and 0 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 du Saint Jacques - 100K - Grand Trail du Saint Jacques is 87 km long with 3291 m of elevation gain.
How long to finish?
With a UTMB Index of 600 (average runner), the estimated time is around 12h16 for Trail du Saint Jacques - 100K - Grand Trail du Saint Jacques.
What's the weather forecast?
The weather for Trail du Saint Jacques - 100K - Grand Trail du Saint Jacques 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 du Saint Jacques - 100K - Grand Trail du Saint Jacques?
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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