Events / Triathlon / Duathlon

Slateman Triathlon & Duathlon 2025

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.


08 Jun 2025



Opening Date: 19.07.2024


Choose your distance


Slateman 2025


08 Jun 2025

Swim: 750 Metres

Bike: 20Km

Run: 5.8Km

Find out more Slateman 2025 Sprint Triathlon
Female Rider using TT Bars at Slateman

Slateman 2025


08 Jun 2025

Swim: 1500m

Bike: 49.9km

Run: 11.9km

Find out more Slateman Standard Triathlon 2025
Female cycle rider at Slateman Triathlon

Slateman 2025

Slateman Legend (70.3)

08 Jun 2025

Swim: 1,900 Metres

Bike: 89.9Km

Run: 23.1Km

Find out more Slateman Legend 70.3 Triathlon 2025
Slateman 2016 sprint bike 256

Slateman 2025

Standard Duathlon

08 Jun 2025

Run 1: 5.8km

Bike: 49.9km

Run 2: 11.5km

Find out more Slateman Standard Duathlon 2025

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 just so lovely & supportive Just the best race in the calendar. Thank you, everyone"

2022 Participant

Read all our reviews

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