Race the mountains of Eryri
Events / Triathlon / Duathlon
Slateman Triathlon & Duathlon 2027
This is where adventure triathlon begins.
Swim in Llyn Padarn beneath Yr Wyddfa. Ride into the mountains of Eryri, taking on the legendary Llanberis Pass. Then leave the road behind and run through the historic Dinorwig slate quarries to a finish line in the heart of Llanberis.
From your first Sprint to the extraordinary 140.6 Ultra, every Slateman distance delivers the same thing: a race shaped by the mountains around it.
WHY SLATEMAN?
Swim beneath Yr Wyddfa
Start your race in the clear waters of Llyn Padarn, surrounded by some of the most dramatic mountain scenery in Wales.
Ride the Llanberis Pass
Take on one of Wales' great cycling climbs as your race heads deep into Eryri.
Run through history
Finish on the trails of the Dinorwig slate landscape, part of a UNESCO World Heritage Site.
Go Beyond One Race – Join the Adventure Triathlon & Duathlon Series 2027
Introducing the Adventure Triathlon & Duathlon Series, a two-event journey across North Wales’ most stunning and demanding landscapes: The Slateman and The Superfeet Sandman.
By entering both events with a Series Bundle, 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.
Dates
13 Jun 2027
Location
Llanberis
Choose your distance
Slateman 2027
Sprint
13 Jun 2027
Swim: 750 Metres
Bike: 20.2Km
Run: 5.8Km
Slateman 2027
Standard
13 Jun 2027
Swim: 1500m
Bike: 49.9km
Run: 11.7km
Slateman 2027
Slateman Legend (70.3)
13 Jun 2027
Swim: 1,900 Metres
Bike: 92.6Km
Run: 23.1KM
Slateman 2027
Slateman Ultra (140.6)
13 Jun 2027
Swim: 2.4 Miles
Bike: 180KM
Run (Chwarel Finish): 44.5KM
Run (Mynydd Finish): 49.9KM
Slateman 2027
Standard Duathlon
13 Jun 2027
Run 1: 5.8km
Bike: 49.9km
Run 2: 11.7km
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
"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
Event Information
Slateman Triathlon & Duathlon 2027
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Slateman Triathlon & Duathlon 2027
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Slateman Triathlon & Duathlon 2027
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Slateman Triathlon & Duathlon 2027
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Slateman Triathlon & Duathlon 2027
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Slateman Triathlon & Duathlon 2027
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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