Arc of Attrition - Arc 25 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 3 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 25 · 2026
| Aid station | Cum. km | Cum. D+ | Seg. km | Seg. D+ | Seg. D- | Crew | Cut-off | Access |
|---|---|---|---|---|---|---|---|---|
| Godrevy | 17.9 | 0 m | 17.9 | 279 m | 277 m | Forbidden | Sun 01:45 PM | — |
| Portreath | 29.6 | 0 m | 11.7 | 298 m | 296 m | Forbidden | Sun 04:00 PM | — |
| Finish/ Porthtowan | 42.0 | 0 m | 12.4 | 471 m | 379 m | — | — | — |
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 | Godrevykm 17.9 | Portreathkm 29.6 | Finish/ Porthtowankm 42.0 |
|---|---|---|---|
| Water | available | available | available |
| Brand products · Näak | available | unavailable | unavailable |
La feuille de ton assistance pour Arc of Attrition - Arc 25 · 2026
L'assistance n'est autorisée sur aucun poste de cette course.
Elevation profile
The course and its aid stations
Arc of Attrition - Arc 25: 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 4h53 to 3h01. 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 | 4h53 | — | 293 g | 3.4 L | 2,442 mg | +3h07 |
| 550 | 4h33 | — | 273 g | 3.2 L | 2,275 mg | +3h27 |
| 600 | 4h14 | — | 254 g | 3 L | 2,117 mg | +3h46 |
| 650 | 3h41 | — | 221 g | 2.6 L | 1,842 mg | +4h19 |
| 700 | 3h31 | — | 211 g | 2.5 L | 1,758 mg | +4h29 |
| 750 | 3h14 | — | 194 g | 2.3 L | 1,617 mg | +4h46 |
| 800 | 3h01 | — | 181 g | 2.1 L | 1,508 mg | +4h59 |
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
852 starters, 1.9% DNF rate, 3 timed checkpoints.
| Segment | km | Median | Middle half | Measured | Median passage | Still ranked |
|---|---|---|---|---|---|---|
| St yves → Godrevy | 18.2 | 1 h 58 | 1 h 45 – 2 h 11 | 839 | 1 h 58 | 848 |
| Godrevy → Portreath | 29.4 | 1 h 40 | 1 h 24 – 1 h 53 | 830 | 3 h 38 | 842 |
| Portreath → Porthtowan | 42.1 | 2 h 00 | 1 h 44 – 2 h 15 | 828 | 5 h 40 | 836 |
“Median passage” is elapsed time from the start, not a clock time: the clock time depends on the edition.
Where runners drop out. Portreath (6) · Godrevy (6) · St yves (4) out of 16 total DNFs.
RAVIT record from the official timing of the 2026 edition, data from September 22, 2026.
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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 25
Weather for Arc of Attrition - Arc 25
The weather for Arc of Attrition - Arc 25 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 25, hour by hour on the courseFrequently asked questions
How many checkpoints?
Arc of Attrition - Arc 25 has 3 checkpoints: 1 aid station and 2 water points. Details are in the two tables above.
What's the longest segment without aid?
The one leading to Godrevy: 17.9 km and 0 m elevation gain. That's the one to load up for first.
What distance and elevation gain?
Arc of Attrition - Arc 25 is 42 km long with 1044 m of elevation gain.
How long to finish?
With a UTMB Index of 600 (average runner), the estimated time is around 4h14 for Arc of Attrition - Arc 25.
What's the weather forecast?
The weather for Arc of Attrition - Arc 25 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 25?
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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