Course map, elevation profile & surface
Fly the course
Follow the route over 3D terrain, kilometre by kilometre.
Race-day light
For a 24:05 finish (an estimate) · starting 14:00 14 May · headlamp km 51–99. Dark means the sun below civil twilight.
Climbs
22 climbs · 8,544 m totalbiggest firstAid stations as published on the course file
| Aid station checkpoint | km | Mile |
|---|---|---|
| A Pen-y-Pass | 11.7 | 7.3 |
| A Ogwen Valley | 21.3 | 13.2 |
| A Llyn Eigiau | 36.4 | 22.6 |
| A Capel Curig | 48.5 | 30.2 |
| A Dolwyddelan | 58.5 | 36.4 |
| A Blaenau Ffestiniog | 70.9 | 44.0 |
| A Croesor | 83.0 | 51.6 |
| A Gwastadanas Farm | 96.4 | 59.9 |
| A Beddgelert | 110.3 | 68.5 |
| A Rhyd-Ddu | 124.2 | 77.2 |
| A Bron-y-Fedw Uchaf | 136.5 | 84.8 |
| A Betws Garmon | 144.6 | 89.9 |
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Conditions typical race-day weather for 14 May at the start
Typical = the median of 2016–2025 for 14 May ±3 days at the start line; a wet day has 1 mm of rain or more. Historical weather from Open-Meteo.
Race almanac the sky on race day
Next race day Fri, May 14, 2027 · 2:00 PM start
First and last light are civil twilight, the sun 6° below the horizon. The moon is lit as at midnight after the start; headlamp hours count a typical finish from the start while the sun is below civil twilight. Worked out for the start line.
Reviews what runners who have been there say
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About this course
Eryri by UTMB Eryri 100M — 2027 covers 161.2 km (100.2 mi) with 9,516 m (31,220 ft) of elevation gain. That is about 59 m per km of climbing, and 9,515 m of descent. The course tops out at 1,066 m and bottoms out at 28 m. There are 12 aid stations on course; the longest stretch between aid is 16.6 km. The profile has 22 sustained climbs; the biggest is the climb from km 0.0, +887 m over 7.0 km at 12.7% on average (steepest stretch 31%). Race day is 14 May 2027, starting at 14:00; the sun rises at 05:21 and sets at 21:06. Typical race-day weather at the start: a high of 15°C and a low of 8°C, with a 46% chance of a wet day. The interactive map above shows the full route with its elevation profile and aid stations, built from the course's GPS file.
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Course history
- Nov 1, 2026Added to the catalog
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