Ultra-Trail Snowdonia - ERYRI 25K (NEW ROUTE) 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 2 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 - Ultra-Trail Snowdonia - ERYRI 25K (NEW ROUTE) · 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 | Tan Yr Wyddfakm 13.7 | Llanberiskm 24.7 |
|---|---|---|
| Water | available | available |
| Brand products · Näak | available | available |
La feuille de ton assistance pour Ultra-Trail Snowdonia - ERYRI 25K (NEW ROUTE) · 2027
L'assistance n'est autorisée sur aucun poste de cette course.
Elevation profile
The course and its aid stations
Ultra-Trail Snowdonia - ERYRI 25K (NEW ROUTE): 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 3h20 to 2h14, and the aid-station stop budget from 0h04 to 0h01. The longer the race, the more stops weigh: this is time you should plan to spend standing still, not only running.
Source
| UTMB® Index | Estimated time | Of which stops | Night hours | Carbs | Fluid | Sodium | Cut-off margin |
|---|---|---|---|---|---|---|---|
| 500 | 3h20 | 0h04 | — | 200 g | 2.3 L | 1,664 mg | +2h10 |
| 550 | 3h04 | 0h03 | — | 184 g | 2.2 L | 1,536 mg | +2h26 |
| 600 | 2h52 | 0h03 | — | 172 g | 2 L | 1,435 mg | +2h38 |
| 650 | 2h41 | 0h02 | — | 161 g | 1.9 L | 1,343 mg | +2h49 |
| 700 | 2h31 | 0h02 | — | 151 g | 1.8 L | 1,257 mg | +2h59 |
| 750 | 2h22 | 0h02 | — | 142 g | 1.7 L | 1,185 mg | +3h08 |
| 800 | 2h14 | 0h01 | — | 134 g | 1.6 L | 1,119 mg | +3h16 |
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
- Arc of Attrition - Arc 20K22 km · 722 m D+ · January 24, 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
- Arc of Attrition - Arc 1224 km · 819 m D+ · January 25, 2026
Ultra-Trail Snowdonia - ERYRI 25K (NEW ROUTE) 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 — Ultra-Trail Snowdonia - ERYRI 25K (NEW ROUTE)
Weather for Ultra-Trail Snowdonia - ERYRI 25K (NEW ROUTE)
The weather for Ultra-Trail Snowdonia - ERYRI 25K (NEW ROUTE) 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 Ultra-Trail Snowdonia - ERYRI 25K (NEW ROUTE), hour by hour on the courseFrequently asked questions
How many checkpoints?
Ultra-Trail Snowdonia - ERYRI 25K (NEW ROUTE) has 2 checkpoints: 2 aid stations. Details are in the two tables above.
What's the longest segment without aid?
The one leading to Tan Yr Wyddfa: 13.7 km and 969 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?
Ultra-Trail Snowdonia - ERYRI 25K (NEW ROUTE) is 25 km long with 1347 m of elevation gain.
How long to finish?
With a UTMB Index of 600 (average runner), the estimated time is around 2h52 for Ultra-Trail Snowdonia - ERYRI 25K (NEW ROUTE).
What's the weather forecast?
The weather for Ultra-Trail Snowdonia - ERYRI 25K (NEW ROUTE) 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 Ultra-Trail Snowdonia - ERYRI 25K (NEW ROUTE)?
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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