Slateman Triathlon 2027

Llanberis, Snowdonia, Wales

13 June 2027 Triathlon Sprint · Standard · Legend (70.3) Adventure triathlonSnowdoniaCold swim

The original Welsh adventure triathlon. A cold swim in Llyn Padarn under Snowdon, a mountain bike leg on closed roads, and a run out onto the slate trails.

Terrain

Mixed

Mountain roads and slate trail running

Elevation

Hilly

· Snowdonia, so genuinely mountainous

Swim

Lake

Llyn Padarn, cold glacial lake water

Wetsuit

Wetsuit compulsory

usually 12-15°C

Region

Wales

Llanberis, Snowdonia, Wales

Your runway

44 weeks to race day: base season

Plenty of runway. This far out, the win is a boring, consistent base rhythm: aerobic volume, strength, technique. The structured 12-week block starts later; what you do now decides how high it can climb.

Recover

Fix the nervous system first. Sleep, HRV, and the noise out.

Align

Fit the plan to your actual life, not the one you wish you had.

Condition

Minimum effective dose. The right sessions, done fresh.

Execute

Race-week protocol, pacing, contingency. Nothing new on race day.

Predict your finish time The 70.3 training plan

Building for this one? 70.3 training plan covers the sessions, the weekly shape and how the block is paced. The R.A.C.E. Framework explains why it is built that way.

“A proper mountain triathlon and one of the best days out in British racing. The lake is genuinely cold in June, so do your open water prep in cold water, not a heated pool.”

Abraham Spring: founder, Unbroken

The race

Slateman is what British triathlon looks like when it stops pretending to be flat. The swim is in Llyn Padarn, glacial and cold enough that wetsuits are compulsory. The bike climbs into the Snowdonia passes. The run heads up onto the old slate quarry trails above Llanberis, so it is part trail race. Sprint, Standard and the Legend 70.3 all run across the weekend.

Questions, answered

When is Slateman Triathlon 2027?

Slateman Triathlon takes place on 13 June 2027.

What distances can I race at Slateman Triathlon?

Sprint · Standard · Legend (70.3). Pick the distance that fits your training runway, not your ego: the right distance is the one you can arrive at fresh.

How hard is the course?

Mixed terrain, hilly profile. Snowdonia, so genuinely mountainous

What is the swim like?

Llyn Padarn, cold glacial lake water. Wetsuit compulsory, usually 12-15°C. Practise open water before race week, not during it.

How long do I need to train for it?

From today you have 44 weeks. A full 12-week recovery-led block fits comfortably: start it in the app and it anchors to this exact date.

How do I enter?

Entries are handled by the organiser. Use the Register button above: it goes straight to the official site.

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Photograph of Llanberis, Snowdonia, Wales: Klr45pmp, CC0, via Wikimedia Commons. Not official race photography.

This listing is for information only. Unbroken is not affiliated with, endorsed by, or sponsored by Slateman Triathlon or its organiser. Details are based on publicly available information; names are used descriptively to identify the event. For accurate, up-to-date information and to enter, always use the official event website.

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