10K
Sat 11 Jul 2026 Caernarfon, Gwynedd, UK Early bird

Snowdonia Trail Eryri 10K

A beautiful 10K with something for all runners on a mixture of road, track and trail and takes in the beautiful lower slopes of Yr Wyddfa (Snowdon), with a stunning downhill to the finish line.

Enter now
  • Sat 11 Jul 2026
  • Early bird
Llanberis, Caernarfon
10K

Early bird on now

09:30

Age 17 & over

£31.99-£37.99

  • 9.8 km trail running + 1335 ft ascent

Event overview

This epic event starts and finishes in Llanberis, Wales’ outdoor capital, and offers Trail Marathon, Ultra Marathon, Half Marathon, 10K and 24-hour options.

runners

The route explores rugged mountain trails, soaring panoramic views and relentless climbs — everything that makes Snowdonia legendary among outdoor enthusiasts. You’ll run through iconic locations including Rhyd Ddu, Beddgelert, Nant Gwynant, Pen y Pass and the slopes of Yr Wyddfa (Snowdon), creating what many consider one of the UK’s most striking trail marathon routes.

Highlights

  • One of the UK's most challenging trail races

    The Ultra Marathon and Marathon are both ITRA & UTMB-indexed races.

  • Spectacular scenery

    Unbeatable views across Eryri (Snowdonia).

  • Lively event village

    Music, commentary, shopping, food, kit demos and toilets.

  • Family friendly vibes

    Family finishes and plenty to see and do.

  • Support and fuel

    Friendly marshals, signage, energy stations and support vehicles.

  • Unique finisher mementos

    Beautifully designed to reflect our event locations and local history.

  • Professional timing

    Chip timing, live tracker and online results.

This event is part of Snowdonia Trail Marathon Eryri Events.

Event community

Laura C.

Laura C.

  • Average fitness
  • Beginner-friendly
  • Dogs allowed at venue
  • Event expo
  • Event village
  • Families
  • Free venue entry
  • Spectators
  • Teams
  • Traders at event

Kit

A list of compulsory and advisable kit is readily available.

Walking poles

You are permitted to carry and use walking poles if you wish to.

Families

The event village is family-friendly and is at a location with lots on offer for families. There'll be a great atmosphere for spectators who can track the person they are supporting using an app so they don't miss them at key points.

  • Bone conducting headphones only
  • Cut off time
  • First aid
  • Hilly
  • Marshals
  • Mass start
  • No cut off time
  • Out and back
  • Sweeper
  • Toilets
  • Water stations
  • GPX available

GPX route

The route is displayed on the map above.

Introduction

It’s your chance to run at your pace, soak in the mountain air, and enjoy a more open course experience than ever before.

The race is curated for trail runners of all abilities, offering outstanding mountain views, woodland sections, and race-day atmosphere without the need to reach ultra distances. It's an achievable adventure with world-class scenery.

Make a weekend of it! You can bring friends or family for their 10K challenge on Saturday, then stay to cheer on the marathoners and ultra runners on Sunday. It’s the perfect weekend to run, support, and enjoy the vibrant event village in Llanberis.

overview

This beautiful 10k has something for all runners. The first 5.5k has a mixture of road, track and trail and takes in the beautiful lower slopes of Yr Wyddfa (Snowdon). It then passes across the valley, dipping into the beautiful woodlands around Dolbadarn Castle, before taking on the gruelling zig-zags that take you to the top of Vivian Quarry. Once here, it's downhill on stunning forest trails all the way to the finish line.

Feed stations

Water and High 5 energy drink and gels will be available at 2 miles/3.2km and 4 miles/ 6.4km.

Cut off

2 hours and 30 minutes.

  • Cafe
  • Mountains
  • Music
  • Paid parking
  • Secure bag storage
  • Toilets

Event HQ

Llanberis
Llanberis
Caernarfon
Gwynedd
LL55
UK

Llanberis, North Wales has superb transport links and is incredibly easy to find.

Registration

Registration is located on the event field in Llanberis situated next to the Community Centre - LL55 4UR.

location

Parking

Parking information is included in your Final Instructions email. Please be considerate to local residents when parking and use official event parking or pay and display car parks.

By car

There’s quick, straightforward access from the North West along the M56 and A55. Motorway links with the Midlands are good too, and the same roads – the M6, M5 and M1 – also bring Snowdonia within easy reach of the South of England

By rail

Direct services (including direct trains from London to Bangor) take you to the popular North Wales coastal destinations from most parts of Britain.

The closest station to Llanberis is Bangor, which is just under 10 miles away. A taxi from here will cost approximately £25. The Sherpa S2 bus will take you from the station and cost between £3-£5. It is possible to cycle.

By sea

Irish Ferries and Stena Line operate regular and high-speed services to Holyhead from Dublin.

By air

Transfers from the international gateways of Manchester, Liverpool and Birmingham take less than two hours.

Accommodation

Llanberis and the surrounding areas offer a wide range of hotels, bed and breakfast, campsites and hostels.

The Royal Victoria Hotel is recommended.

  • Chip timing
  • Eco medal
  • Event app

Included

  • Lively Event Village

    Music, commentary, shopping, food, kit demos & toilets.

  • Family friendly vibes

    Family finishes, signage, energy stations and plenty to see and do.

  • On course support

    Brilliant marshals, signage, and pick up vehicles.

  • Unique finisher mementos

    Beautifully designed to reflect our event locations and local history.

  • Spectacular scenery

    Unbeatable views across Eryri (Snowdonia).

  • Professional timing

    Chip timing, and live online results.

Optional extra

  • Race photography

Prizes

There will be a prize-giving ceremony after the races. Prizes are not sent out after the event, so make sure you attend the ceremony and receive your big Welsh cheer!

Prize Categories for the Snowdonia Trail 10K are (for both men and women).

  • Overall Top 3*
  • Senior 1st runner
  • V40 1st runner
  • V50 1st runner
  • V60 1st runner
  • V70 1st runner

* If any runner places in Overall and Vet then a drop down system will occur.

If you are looking for a challenge, the Snowdonia Trail Race is up there with the toughest in the U.K. A punishing and beautiful experience in equal measure, ensure this one is on your bucket list. Luke Royle (2019) RaceCheck

Absolutely AMAZING day - so well signposted, not the slightest chance of getting lost and wonderful camaraderie amongst all runners. I met some really wonderful people at various points on the course and it really keeps you going strong!!! Anonymous post-event feedback 2023

Loved running the marathon - many thanks for what was the best organised trail event I’ve done. The Marshalls were brilliant.  Post event feedback 2023

 

 

My first trail marathon and what can I say but 'WOW’. Adam Gurney, Racecheck

Race village, route marking, feed stations, marshals, views and sense of achievement at the very highest standard. Do it! Matt Hall (2022) RaceCheck

  • Bring your own cup
  • Plastic bottle free
  • Plastic-free event
  • Public transport links
  • Recycling
  • Reusable cups
  • Sustainability policy

As a local Welsh company the organiser's goal is to showcase the beautiful natural environment without causing harm. Event since their first race in 2011, they have avoided plastic bottles, offered locally-sourced Welsh slate finisher mementoes and have lead on sustainability in events.

  • Age 17 & over
  • Entries open
  • Enter online

If you opted for a postal entry there is no need to register in person before the event. Your Final Instructions will be printed on the back of your bib, and they will also be available on the website 10 days prior to the race.

If your bib is not being posted you will need to collect it from registration. Registration will take place on Saturday afternoon and before the race on Sunday morning. We will confirm specific times in your Final Instructions.

Entry fees

Entry fee

£31.99

Valid to 31/12/2025

Entry fee

£33.99

Valid 31/12/2025 - 05/07/2026

Entry fee

£37.99

Valid 05/07/2026 - 09/07/2026

Enter now

Other races at event

  • Sun 12 Jul 2026
  • #2 of 5
Llanberis, Caernarfon
Half Marathon

09:00

Age 17 & over

£44.99-£49.99

  • 12.9 miles trail running + 3959 ft ascent
  • Sun 12 Jul 2026
  • #3 of 5
Llanberis, Caernarfon
Marathon

08:30

Age 18 & over

£59.99-£64.99

  • 27.3 miles trail running + 1685 m ascent
  • Sun 12 Jul 2026
  • #4 of 5
Llanberis, Caernarfon
Ultra Marathon

06:30

Age 20 & over

£97.99-£104.99

  • 57 km trail running + 2199 m ascent
  • Sat 11 - Sun 12 Jul 2026
  • #5 of 5
Llanberis, Caernarfon
Black Diamond Yr Wyddfa | Snowdon24

10:00

Age 18 & over

£129.99-£319.99

  • 24 hrs trail running + 3182 ft ascent

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