Slateman Triathlon & Duathlon | Standard Duathlon

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 brutal and beautiful Slateman route delivers a true test of endurance through the heart of Eryri (Snowdonia). You’ll tackle a tough opening trail run, an iconic mountain bike leg that almost circumnavigates Yr Wyddfa, and a final run that plunges deep into slate quarry history before a hard-earned finish in Llanberis. Every section is demanding, scenic and packed with character.

Description

With so much history, your first tough 5.8 km run will have loads to keep you motivated as your legs complain. Starting under the finish arch to run 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 (Snowdon), past the Quarry Hospital and back the way you’ve come and diverting towards transition.

The cycle route takes in some of the most iconic views in North Wales. Begin the cycle by turning right out of transition and heading towards Caernarfon. As you flow around the course towards Beddgelert, make sure you keep an eye out on your left because you’re circumnavigating Yr Wyddfa! Once you’re through the beautiful, quaint village of Beddgelert, you’ve got one last challenge to come. You must now cycle up the narrow and winding Nant Gwynant Pass and return to the top of Pen y Pass. Make sure you take in some of the most spectacular views in the country before you descend back to Llanberis and transition.

The final run starts relatively easy but no less beautiful than the rest of the route, taking in the historic Dolbadarn Castle, but as you run past Llyn Peris at the foot of the Dinorwic Slate Quarry, don’t lose your nerve when you see what is to come. A 2km climb up the zig zags through the quarry takes your legs and your breath away. Carrying on through this most awesome man-made landscape for another 1.5km, you then come to the descent into the forest. Head towards Fachwen and a short section of road, followed by a steep descent once more into the trees. You will then make your way along the beautiful trails of Parc Padarn and past the Old Quarry Hospital as you make your final descent down to the field and the final straight to the finish line. You may, by now, have some idea of what it was like to be a real Slateman.

Route highlights

First run | Trail

• Start beneath the finish arch and head straight onto high-quality trail
• Pass Vivian Quarry and run towards Dinorwic
• Short road section towards Fachwen
• Steep forest descent with glimpses of Yr Wyddfa (Snowdon)
• Run past the Old Quarry Hospital
• Loop back and divert towards transition

Cycle | Snowdonia classic

• Turn right out of transition and head towards Caernarfon
• Flowing roads as you circle towards Beddgelert
• Constant views as you circumnavigate Yr Wyddfa
• Pass through the picturesque village of Beddgelert
• Major challenge: climb the narrow, winding Nant Gwynant Pass
• Reach the top of Pen y Pass
• Fast, scenic descent back to Llanberis and transition

Final Run | Quarry & forest challenge

• Early flatter section past Dolbadarn Castle
• Run alongside Llyn Peris beneath Dinorwic Slate Quarry
• Relentless 2km zig-zag climb through the quarry
• Continue across dramatic slate landscapes for another 1.5km
• Descend into forest trails towards Fachwen
• Short road section followed by a steep forest drop
• Flowing trails through Parc Padarn
• Pass the Old Quarry Hospital
• Final descent to the field and fast run-in to the finish

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 55 minutes to complete your Run 1 and exit transition.
• You have a total of 3 hours and 5 minutes to complete your bike and exit transition.
• You have a total of 2 hours 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

• 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