Eryri by UTMB takes place on Fri, May 14, 2027 in Llanberis, United Kingdom. The main route is 56 km.
- Date
- Fri, May 14, 2027
- Start
- Llanberis 🇬🇧
- Distance
- 56 km
- Climbing
- 3,400 m
- Level
- Open to all
Eryri by UTMB is an alpine-scale mountain ultra-trail running event featuring technical trails and rugged peaks through the landscape of Snowdonia National Park in North Wales.
Official event pageWhat this race demands
Eryri by UTMB demands sustained alpine-scale climbing and technical mountain running proficiency across 56 kilometers and 3400 meters of elevation gain.
Climbing volume
The course accumulates 3400 meters of elevation gain over 56 kilometers, requiring continuous uphill output and muscular endurance on steep mountain grades.
Technical footwork
Navigating rugged peaks and technical trails through Snowdonia National Park demands high concentration and durable lower legs for uneven terrain.
Endurance capacity
An ultra-trail distance of 56 kilometers requires a deep aerobic base and efficient pacing to sustain forward motion over many hours.
A race duration exceeding several hours requires an intake of 60 to 90 grams of carbohydrates per hour to maintain energy levels.
Estimated finish times
Estimates by level, not promises. Your own number depends on your fitness on the day.
Your road to race day
Race day at Eryri by UTMB is 38 weeks away. This is how a coach divides that time. The first phase starts now.
01Base26 weeks · Aug 22, 2026 – Feb 19, 2027
Aerobic foundation: mostly steady endurance work that grows the aerobic engine and the durability the later phases stand on.
02Build6 weeks · Feb 20, 2027 – Apr 2, 2027
Progressive overload: training load climbs in waves, with harder weeks stacked on the base and planned recovery weeks that let the gains land.
03Peak3 weeks · Apr 3, 2027 – Apr 23, 2027
The hardest weeks of the plan: race-specific intensity at nearly full training load, sharpening exactly what this race asks for.
04Taper2 weeks · Apr 24, 2027 – May 7, 2027
Volume drops while intensity stays: short, sharp efforts keep the legs awake as fatigue drains away.
05Race week1 week · May 8, 2027 – May 14, 2027
Openers, rest and logistics. The work is done; the job now is arriving fresh.
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