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About RaceIndexOur methodologyData coverageCyclingTriathlon
  • Half Marathon
  • 20.8 km
  • Llanberis
  • Event dates –
  • Entry from £47
  • Past event

Snowdonia Trail Marathon Eryri Half Marathon

This race edition

Race date
Date not confirmed for this distance
Race timezone
Timezone not confirmed
Edition status
Status not confirmed

Entry options

2026 edition

Entry options are not yet confirmed for this edition. Check the organiser before making plans.

true cost £177

Official event website ↗
Plan my trainingPlan my paceData current as of

Decision summary

Snowdonia Trail Marathon Eryri Half Marathon at a glance

Entry fee
£47

Lower than 24% of comparable known fees

Typical conditions
67/100

Historical race-date favourability, not a forecast

Evidence depth
29 verified facts

Source facts available

Route details

Known course facts at a glance

Methodology →

Snowdonia Trail Marathon Eryri Half Marathon has known course details for its half marathon race. The summary below keeps the focus on what is confirmed for the course.

Official distance
20.8 km
Terrain
Trail
Scenery
Countryside, Mountain, Parkland, Forest, Lakeside, Moorland, Historic

Quick answers

What runners ask first

Where can I find the Snowdonia Trail Marathon Eryri Half Marathon route map?

Use the official course links on this page for the organiser route page, map PDF or route download.

Official course links

How hilly is the Snowdonia Trail Marathon Eryri Half Marathon?

The Snowdonia Trail Marathon Eryri Half Marathon is described as mountainous. The course listing puts the climb at 1,192 m.

Where does the Snowdonia Trail Marathon Eryri Half Marathon route go?

Underfoot, expect mountain and forest trails, stone paths, slate quarry tracks. It passes Snowdon Ranger Path, Yr Wyddfa (Snowdon), Finger Stone, Llanberis Path and Dolbadarn Castle. Described as probably the biggest trail marathon in the UK. a bilingual (English/Welsh) trail running festival across four distances over two days.

What should runners know on race day for the Snowdonia Trail Marathon Eryri Half Marathon?

A bilingual (English/Welsh) trail running festival across four distances over two days.

Race character

Scenery

  • Countryside
  • Mountain
  • Parkland
  • Forest
  • Lakeside
  • Moorland
  • Historic

Atmosphere

  • Wilderness
  • Scenic Tour
  • Festival

Terrain

  • Trail
Elevation character
Mountainous
Source-stated ascent
1,192 m

Entry, logistics and records

Entry requirements

Entry status
Past event: The listed edition date has passed.

Race day logistics

Race village
Event village with music, commentary, shopping, food, kit demos and toilets.
Medal
Finishers receive beautifully designed slate mementos reflecting the event's locations and local history.

Course facts

Surface
Mountain and forest trails, stone paths, slate quarry tracks.
Landmarks
Snowdon Ranger Path, Yr Wyddfa (Snowdon), Finger Stone, Llanberis Path, Dolbadarn Castle, Zig Zag path
Notable features
  • Described as probably the biggest trail marathon in the UK
  • a bilingual (English/Welsh) trail running festival across four distances over two days

What does it really cost to run?

Estimated cost to the start line from National Average
Entry fee£47
Travel (modelled)£40
Accommodation (modelled)£90
Estimated total£177
Entry fee is a sourced fact. Travel and accommodation are modelled estimates for a typical runner from this region, not quoted prices.

What are typical race-day conditions?

  • 15°CTypical temperature
  • 20 kphTypical wind
  • 4 mmTypical rainfall
  • 67Favourability /100
Typical conditions for the race date and locality, warmer than the endurance-optimal window. These are climatological norms, not a forecast, and are shared across every distance at this event.

More race details

How much does the Snowdonia Trail Marathon Eryri Half Marathon cost?

The adult entry fee is £47, and the estimated true cost to the start line is about £177 including modelled travel and accommodation.

How we calculated this

Published facts and derived model outputs on this page are tied to stored sources or a published, version-locked methodology. We show the provenance so runners, coaches and organisers can check it. Data on this page is current as of .

Derived numbers use scoring-methodology-v1.0.

Sources used on this page (2)

Read the full methodology →