Ultra-Trail Snowdonia - Eryri 50K 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 4 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 50K · 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 | Gwastadanas Farmkm 15.3 | Bron y Fedw Uchafkm 32.9 | Betws Garmonkm 41.0 | Llanberiskm 57.6 |
|---|---|---|---|---|
| Water | ✕ | ✕ | ✕ | ✕ |
| Brand products · Näak | ✕ | ✕ | ✕ | unavailable |
| Hot meal | unavailable | unavailable | unavailable | ✕ |
Elevation profile
The course and its aid stations
Ultra-Trail Snowdonia - Eryri 50K: 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 10h20 to 6h26, and the aid-station stop budget from 0h23 to 0h08. The longer the race, the more stops weigh: this is time you should plan to spend standing still, not only running.
Below a UTMB® Index of roughly 355, the overall cut-off of 14h00 is no longer reachable at the estimated pace.
| UTMB® Index | Estimated time | Of which stops | Night hours | Carbs | Fluid | Sodium | Cut-off margin |
|---|---|---|---|---|---|---|---|
| 500 | 10h20 | 0h23 | — | 620 g | 7.2 L | 5,163 mg | +3h40 |
| 550 | 9h22 | 0h18 | — | 562 g | 6.6 L | 4,680 mg | +4h38 |
| 600 | 8h37 | 0h15 | — | 517 g | 6 L | 4,311 mg | +5h23 |
| 650 | 8h02 | 0h13 | — | 482 g | 5.6 L | 4,017 mg | +5h58 |
| 700 | 7h23 | 0h11 | — | 443 g | 5.2 L | 3,693 mg | +6h37 |
| 750 | 6h56 | 0h09 | — | 416 g | 4.8 L | 3,463 mg | +7h04 |
| 800 | 6h26 | 0h08 | — | 386 g | 4.5 L | 3,218 mg | +7h34 |
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
- Winter 5588 km · 2,006 m D+ · December 5, 2026
- Arc of Attrition - Arc 100K83 km · 2,588 m D+ · January 23, 2027
- Arc of Attrition - Arc 50K49 km · 1,329 m D+ · January 24, 2027
- South Downs Way 50M79 km · 1,754 m D+ · April 10, 2027
- Ultra-Trail Snowdonia - Eryri 80K79 km · 2,547 m D+ · May 14, 2027
- Eryri by UTMB® - Eryri 80K®79 km · 2,547 m D+ · May 14, 2027
- Eryri by UTMB® - Eryri 50K®58 km · 3,407 m D+ · May 15, 2027
- Run Through Trails - Beat Box Hill50 km · 1,270 m D+ · October 10, 2026
- Cartmel - Lakes in a Day77 km · 3,800 m D+ · October 10, 2026
Sources and method
- Time projection — les temps par cote sont repris des passages réels des coureurs de chaque tranche sur les éditions précédentes de cette course, arrêts aux ravitaillements compris. Aucune formule n'intervient tant que ces résultats existent.
- 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 50K
Weather for Ultra-Trail Snowdonia - Eryri 50K
The weather for Ultra-Trail Snowdonia - Eryri 50K 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 50K, hour by hour on the courseFrequently asked questions
How many checkpoints?
Ultra-Trail Snowdonia - Eryri 50K has 4 checkpoints: 4 aid stations. Details are in the two tables above.
What's the longest segment without aid?
The one leading to Bron y Fedw Uchaf: 17.6 km and 1,131 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 50K is 58 km long with 3407 m of elevation gain.
How long to finish?
With a UTMB Index of 600 (average runner), the estimated time is around 8h37 for Ultra-Trail Snowdonia - Eryri 50K.
What's the weather forecast?
The weather for Ultra-Trail Snowdonia - Eryri 50K 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 50K?
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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