Slateman Triathlon & Duathlon | Slateman Ultra (140.6) 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

The Slateman Ultra is the ultimate endurance test in North Wales, delivering huge distances, relentless climbing and world-class mountain scenery. Set beneath Yr Wyddfa (Snowdon), this iconic course demands exceptional fitness, resilience and determination. From a long open-water swim to repeated mountain bike loops and a punishing lap-based run, this is a race where strategy, grit and time management are just as important as strength.

Route highlights

Swim | Llyn Padarn

• Long freshwater swim beneath Yr Wyddfa
• Set within a dramatic landscape shaped by Wales’ slate-mining history
• A serious opening challenge before heading onto the bike

Cycle – Ultra Mountain Loop

• Climb the iconic Llanberis Pass straight out of transition
• Reach Pen y Pass, riding alongside Yr Wyddfa
• Turn towards Capel Curig, home of Plas y Brenin
• Pass Llyn Mymbyr and Moel Siabod with spectacular open views
• Ride through the Ogwen Valley, surrounded by Tryfan, Glyder Fach and Glyder Fawr, and the start of the Carneddau mountain range
• Turn towards Tregarth, riding the lower but still demanding mountain flanks
• Join the Standard route near Llanrug, circling towards Y Waenfawr
• Flow through to Beddgelert, circumnavigating Yr Wyddfa
• Final major climb up the narrow Nant Gwynant Pass
• Return to Pen y Pass, then descend back to Llanberis
• Sting in the tail: turn around and complete the entire loop again

Run – Slateman Ultra

• Scenic start past Dolbadarn Castle
• Run alongside Llyn Peris at the base of Dinorwic Slate Quarry
• Brutal 2km zig-zag climb through the quarry
• Continue across dramatic, man-altered slate landscapes
• Descend into forest trails towards Fachwen
• Short road section followed by another steep forest descent
• Flowing trails through Parc Padarn
• Pass the Old Quarry Hospital
• Return to the lap point — and repeat

Finish options and awards

• Mynydd Finish | Complete three run loops by 6:30pm to earn the chance to ascend Yr Wyddfa (Snowdon) as your final challenge
• Chwarel Finish | Complete four full quarry run loops
• Llechan Finish | Awarded to anyone completing at least two run loops

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

• Overall - Top 3 

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