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Opening Date: 04.07.2025

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Events / Triathlon / Duathlon

Slateman Triathlon & Duathlon 2026

The Slateman Triathlon & Duathlon is the most iconic multi-sport adventure race in Wales. Starting in Llanberis, the heart of Eryri (Snowdonia)’s industrial heritage, this is an unparalleled race which combines stunning scenery with epic challenges. 220 Tri Magazine has listed the Slateman amongst the world's best triathlons.

Now staged in June, the warmer water temperatures and a party atmosphere all surrounded by stunning scenery will make this an event not to be missed from any athlete's calendar.

Are you up for the trio? The Slateman is also the first part of our Adventure Series of triathlons & duathlons.

Dates

14 Jun 2026

Location

Llanberis

Opening Date: 04.07.2025

Pre-register

Choose your distance

SLATEMAN BANNER 1

Slateman 2026

Sprint

14 Jun 2026

Swim: 750 Metres

Bike: 20.2Km

Run: 5.8Km

Find out more Slateman Sprint Triathlon 2026
Female Rider using TT Bars at Slateman

Slateman 2026

Standard

14 Jun 2026

Swim: 1500m

Bike: 49.9km

Run: 11.7km

Find out more Slateman Standard Triathlon 2026
Female cycle rider at Slateman Triathlon

Slateman 2026

Slateman Legend (70.3)

14 Jun 2026

Swim: 1,900 Metres

Bike: 92.6Km

Run: 23.1KM

Find out more Slateman Legend 70.3 Triathlon 2026
Slateman Ultra Full Distance Triathlon rider

Slateman 2026

Slateman Ultra

14 Jun 2026

Swim: 2.4 Miles

Bike: 180KM

Run (Chwarel Finish): 44.5KM

Run (Mynydd Finish): 49.9KM

Find out more Slateman Ultra (140.6) Triathlon 2026
Slateman 2016 sprint bike 256

Slateman 2026

Standard Duathlon

14 Jun 2026

Run 1: 5.8km

Bike: 49.9km

Run 2: 11.7km

Find out more Slateman Standard Duathlon 2026
The Slateman Triathlon is part of the Adventure Series. Enter Now.

What's Included

The event village for the XTERRA Snowdonia Trail Marathon in Llanberis, Wales

Lively Event Village

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

Family friendly vibes at Slateman Traithlon

Family Friendly Vibes

Family finishes and plenty to see and do.

Marshal wearing an orange high vis jacket

On Course Support

Brilliant marshals, signage and pick up vehicles

Slateman Slate Mockup

Unique Finisher Mementos

Beautifully designed to reflect our event locations and local history.

Slateman Llanberis Pass Bike Rider

Spectacular Scenery

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

Winner at the Slateman Triathlon

Professional Timing

Chip timing & live online results

Promo banner

"As always, a fantastic event, amazing marshals. Thank you to each & every one of you for an amazing job. I had the best weekend & all the competitors on course or in transition were so lovely & supportive. Just the best race in the calendar. Thank you, everyone"

2022 Participant

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Event Partners

Working with local communities