Arc of Attrition - Arc 12 2026
The forecast arrives five days before the start.
Here you'll find the elevation profile and an estimated finish time based on your UTMB Index.
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 - Arc of Attrition - Arc 12 · 2026
| Aid station | Cum. km | Cum. D+ | Seg. km | Seg. D+ | Seg. D- | Crew | Cut-off | Access |
|---|---|---|---|---|---|---|---|---|
| Portreath | 11.6 | 0 m | 11.6 | 322 m | 321 m | — | Mon 09:30 PM | — |
| Porthtowan | 24.3 | 0 m | 12.7 | 497 m | 405 m | — | Mon 09:30 PM | — |
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
Aid station contents not documented.
La feuille de ton assistance pour Arc of Attrition - Arc 12 · 2026
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
Arc of Attrition - Arc 12: 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 2h39 to 1h33. 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.
Source| UTMB® Index | Estimated time | Night hours | Carbs | Fluid | Sodium | Cut-off margin |
|---|---|---|---|---|---|---|
| 500 | 2h39 | — | 159 g | 1.9 L | 1,325 mg | +707h51 |
| 550 | 2h24 | — | 144 g | 1.7 L | 1,200 mg | +708h06 |
| 600 | 2h09 | — | 129 g | 1.5 L | 1,075 mg | +708h21 |
| 650 | 1h59 | — | 119 g | 1.4 L | 992 mg | +708h31 |
| 700 | 1h49 | — | 109 g | 1.3 L | 908 mg | +708h41 |
| 750 | 1h40 | — | 100 g | 1.2 L | 833 mg | +708h50 |
| 800 | 1h33 | — | 93 g | 1.1 L | 775 mg | +708h57 |
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.
Other trails worth preparing for in France
- Arc of Attrition - Arc 20K22 km · 722 m D+ · January 24, 2027
- Ultra-Trail Snowdonia - ERYRI 25K (NEW ROUTE)25 km · 1,347 m D+ · May 16, 2027
- Eryri by UTMB® - Eryri 25K®25 km · 1,347 m D+ · May 16, 2027
- Skyline Scotland by UTMB® - Aonach Mòr Anarchy®21 km · 938 m D+ · September 19, 2027
- Cartmel - Lakes in a Day Half33 km · 950 m D+ · October 10, 2026
- Kinlochleven - Ben Nevis Skyline28 km · 1,650 m D+ · September 19, 2026
- Kinlochleven - Trail Half Marathon22 km · 386 m D+ · September 19, 2026
- Arc 1224 km · 766 m D+ · January 25, 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 — Arc of Attrition - Arc 12
Weather for Arc of Attrition - Arc 12
The weather for Arc of Attrition - Arc 12 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 Arc of Attrition - Arc 12, hour by hour on the courseFrequently asked questions
How many checkpoints?
Arc of Attrition - Arc 12 has 2 checkpoints: 2 checkpoints with undocumented contents. Details are in the two tables above.
What distance and elevation gain?
Arc of Attrition - Arc 12 is 24 km long with 819 m of elevation gain.
How long to finish?
With a UTMB Index of 600 (average runner), the estimated time is around 2h09 for Arc of Attrition - Arc 12.
What's the weather forecast?
The weather for Arc of Attrition - Arc 12 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 Arc of Attrition - Arc 12?
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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