Arc of Attrition - Arc 100 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 10 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 - Arc of Attrition - Arc 100 · 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 | Lizard Pointkm 17.0 | Porthlevenkm 39.7 | Penzancekm 63.7 | Porthcurnokm 81.2 | Land's Endkm 88.6 | Pendeenkm 104.7 | Lelantkm 132.3 | Godrevykm 142.9 | Portreathkm 154.7 | Porthtowankm 161.9 |
|---|---|---|---|---|---|---|---|---|---|---|
| Water | available | available | available | available | available | available | available | available | available | available |
| Hot meal | unavailable | available | available | unavailable | available | unavailable | available | unavailable | unavailable | unavailable |
| Brand products · Näak | unavailable | unavailable | unavailable | unavailable | unavailable | available | unavailable | available | unavailable | unavailable |
La feuille de ton assistance pour Arc of Attrition - Arc 100 · 2026
Ton assistance peut te voir à ces postes. Ton plan RAVIT y met tes heures, ce qu'elle te tend et la route pour y aller.
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 100: 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 32h22 to 19h48. 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 365, the overall cut-off of 36h00 is no longer reachable at the estimated pace.
| UTMB® Index | Estimated time | Night hours | Carbs | Fluid | Sodium | Cut-off margin |
|---|---|---|---|---|---|---|
| 500 | 32h22 | 10.4 | 1,942 g | 22.7 L | 16,183 mg | +3h38 |
| 550 | 29h44 | 10 | 1,784 g | 20.8 L | 14,867 mg | +6h16 |
| 600 | 27h30 | 10 | 1,650 g | 19.3 L | 13,750 mg | +8h30 |
| 650 | 25h28 | 10 | 1,528 g | 17.8 L | 12,733 mg | +10h32 |
| 700 | 22h58 | 10 | 1,378 g | 16.1 L | 11,483 mg | +13h02 |
| 750 | 21h23 | 10 | 1,283 g | 15 L | 10,692 mg | +14h37 |
| 800 | 19h48 | 10 | 1,188 g | 13.9 L | 9,900 mg | +16h12 |
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.
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- Ultra-Trail Snowdonia - Eryri 100M164 km · 9,356 m D+ · May 14, 2027
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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 100
Weather for Arc of Attrition - Arc 100
The weather for Arc of Attrition - Arc 100 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 100, hour by hour on the courseFrequently asked questions
How many checkpoints?
Arc of Attrition - Arc 100 has 10 checkpoints: 6 aid stations and 4 water points. Details are in the two tables above.
What's the longest segment without aid?
The one leading to Lelant: 27.6 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?
Arc of Attrition - Arc 100 is 162 km long with 4892 m of elevation gain.
How long to finish?
With a UTMB Index of 600 (average runner), the estimated time is around 27h30 for Arc of Attrition - Arc 100.
What's the weather forecast?
The weather for Arc of Attrition - Arc 100 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 100?
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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