Epic racing in the heart of Eryri
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.
Choose your distance
Slateman 2025
Sprint
08 Jun 2025
Swim: 750 Metres
Bike: 20Km
Run: 5.8Km
Slateman 2025
Standard
08 Jun 2025
Swim: 1500m
Bike: 49.9km
Run: 11.9km
Slateman 2025
Slateman Legend (70.3)
08 Jun 2025
Swim: 1,900 Metres
Bike: 89.9Km
Run: 23.1Km
Slateman 2025
Standard Duathlon
08 Jun 2025
Run 1: 5.8km
Bike: 49.9km
Run 2: 11.5km
What's 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 & live online results
"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
Event Information
Slateman Triathlon & Duathlon 2025
FAQs
Slateman Triathlon & Duathlon 2025
Travel & Accommodation
Slateman Triathlon & Duathlon 2025
Info for Locals
Slateman Triathlon & Duathlon 2025
Volunteer
Slateman Triathlon & Duathlon 2025
Gallery
Slateman Triathlon & Duathlon 2025
Race Reports
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We are proud that all our events are bilingual. Signs, registration and commentary are available in English and Welsh.
Event Partners
Working with local communities
Looking after our environment
Find out more about Looking after our environment
Tees for Trees
Find out more about Tees for Trees