Slateman Triathlon & Duathlon | Sprint Triathlon

Season Pass

Join the Adventure Triathlon & Duathlon Series 2026:

• The Slateman
• The Superfeet Sandman

Introducing the Adventure Triathlon & Duathlon Series 2026, a two-event journey across North Wales’ most stunning and demanding landscapes: The Slateman and The Superfeet Sandman.

By entering both events with a Season Pass, you’ll become part of an exclusive community of multi-sport athletes taking on the full adventure. You’ll also unlock extra benefits designed to make your season unforgettable:

• Guaranteed entry into both The Slateman & The Superfeet Sandman
• Free limited-edition Adventure Series hoodie
• Exclusive series results and rankings — see how you perform across both races
• Choice of distance: Sprint, Standard, or Legend (70.3) triathlon, plus Duathlon options

Whether you’re aiming for your first multi-race season or chasing podium glory, the Season Pass is your ticket to a complete North Wales triathlon experience — from the mountains to the sea.

Ready to double your adventure?

GPX route

The route is displayed on the map above.

Overview

This spectacular triathlon showcases the very best of North Wales, racing through landscapes shaped by slate, stone and mountain legend. You’ll swim in the clear waters of Llyn Padarn, cycle the iconic Llanberis Pass on closed roads, and finish with a tough, scenic trail run through historic quarries and forest tracks — all under the watchful presence of Yr Wyddfa (Snowdon).

Description

Swim in Llyn Padarn in the shadow of Yr Wyddfa (Snowdon) surrounded by the history of Slate Mining in the Welsh hills.

Cycle alongside Yr Wyddfa, climbing up the famous Llanberis Pass. You’ll first cycle past the historic Dinorwic Slate Quarry and on through Nant Peris; as the climb really starts to burn you’ll be able to distract your mind with the incredible mountains that surround you. You turning point is the famous Pen y Gwryd Hotel where Hilary and Tenzing trained to take on Mount Everest. There's one final uphill struggle back to the top of Pen y Pass then it's down down down all the way back to Llanberis and transition with views all the way to Anglesey. The section from Nant Peris to Pen y Gwryd and back again is all on closed roads offering a once in a lifetime opportunity to cycle on the famous pass without traffic passing.

With so much history the tough 5.8 km run will have loads to keep you motivated as your legs complain. Running on some of the best trails around, you’ll go past Vivian Quarry, and head towards Dinorwic, before taking a short section of road in the direction of Fachwen. You’ll then turn steeply downhill through beautiful forests, with glimpses of Yr Wyddfa, past the Quarry Hospital and back along the home straight through the fields and to the finish line where a warm Always Aim High welcome will greet you.

Route highlights

• Start and finish at Plas y Brenin, the National Outdoor Centre, with a lively event village atmosphere
• Iconic Snowdonia terrain, taking in the Carneddau and Glyderau mountain ranges
• Technical trails and ridgelines, including rocky, narrow and exposed sections
• Big mountain climbs and exhilarating descents throughout all distances
• Clearly marked routes supported by marshals and experienced mountain teams
• Spectacular panoramic views across the Ogwen Valley, lakes and surrounding peaks
• Memorable mountain finish, celebrating a true high-mountain running challenge

Cut off times

In the interest of athlete safety and the safety of our volunteers on the course, there will be strict cut-off times in place.

• You have a total of 35 minutes to complete your swim and exit transition.
• You have a total of 1 hour and 45 minutes to complete your bike and exit transition.
• You have a total of 1 hour and 15 minutes to complete your run.

Event HQ

Llanberis
Llanberis
Caernarfon
Gwynedd
LL55
UK

Included

• Lively Event Village

  Music, commentary, shopping, food, and chill out zones.

• Family friendly vibes

  Family finishes 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

  Eryri's awe-inspiring scenery is the backdrop to your race.

• Professional timing

  Chip timing, and live online results.

Optional extra

• Race photography

Prizes

Individual

• Overall - Top 3
• Junior U20 - Top 1
• Senior 20 - Top 1
• Senior 30 - Top 1
• Vet 40 - Top 1
• Vet 50 - Top 1
• Vet 60 - Top 1
• Vet 70 - Top 1

Included

Teams

• 1st Team

I have been racing for 30+ years and this was not only a superb setting with outstanding scenery on the bike and run but also the toughest 70:3 run I’ve ever raced. Well organised; all the marshals and team were happy and helpful, would certainly recommend as a race to do. 2025 Participant

I entered this event based on reviews and after the fantastic time I had at the Sandman Triathlon the previous September. I cannot fault any part of the event. A stunning and demanding route on both the bike and run really pushed me, and I could have kept swimming in the lake for ages. Brilliant marshal support and organisation in Llanberis meant everything worked perfectly. I would certainly recommend this event to anyone ready for a proper challenge in beautiful surroundings. I will definitely return and hope to fit in the whole adventure series next year. Helen W

My review is long and detailed because I couldn’t find any sprint-distance-specific reviews when I was researching the race. If you are thinking about entering next year — do it, but be prepared. Claire F

A choice of four triathlon distances set in the beautiful scenery of Snowdonia. Cold open-water swim with challenging hilly run and bike courses. Meirion M

Reviews thanks to RaceCheck

Entry fees