The Snowdonia Slate Trail Ultra is not just another race. Covering 145km of rugged beauty, it’s a unique opportunity to run through living history, exploring the quieter corners of Snowdonia while honouring its rich slate heritage. For anyone seeking a race that blends physical challenge with cultural depth, this one stands apart.
From Community Vision to World-Class Trail
The Snowdonia Slate Trail was officially launched in 2017, the culmination of four years of voluntary work by the Cwm Community Action Group. Based in Cwm Penmachno a village once home to 500 slate workers, now reduced to just 70 residents the group’s mission was simple but ambitious: create a long-distance trail that would revive business opportunities for former slate villages while showcasing the world-renowned slate landscape to a wider audience.
Much of the trail’s development is thanks to Aled Owen, author of the Snowdonia Slate Trail Guidebook. Born and raised near Bethesda, Aled designed the route to bring attention to Snowdonia’s slate heritage and to lead people into its less-visited areas.
Their vision succeeded. Today, the 145km loop not only draws hikers and trail runners but also highlights the slate industry’s cultural and historical significance, recently recognised by UNESCO as a World Heritage Site.
Aled is also a keen runner, and seeing the Slate Trail Ultra thrive is a source of great pride. He hopes the race will continue to grow under its new organisers and that future participants will be inspired to test themselves against the course records.
The Race: Runnable, Relentless, and Rewarding
At first glance, the Slate Trail Ultra looks deceptively runnable. The paths are generally non-technical, and the gradients are not extreme compared to other UK ultras. But therein lies the challenge: the sustained effort of running over 145km can take a heavy toll.
Early pacing mistakes often come back to haunt runners as hip flexors tighten, blisters worsen, and fatigue bites. What begins as a smooth, flowing course can quickly become a battle of attrition.
Add in Snowdonia’s famously unpredictable weather; heavy rain, swirling winds, sudden temperature drops and you have an event where resilience, strategy, and humility matter as much as fitness. There are no “bad weather” route options. You must be ready for anything, in daylight and in darkness.
Not a Vetted Race, But Not for Beginners
The Slate Trail Ultra is not a vetted race. Entrants are trusted to assess their own readiness, but organisers strongly recommend arriving fully trained and experienced in real-world trail running.
This is not a race where a fast 50km or road marathon result will carry you through. Success depends on a combination of endurance, navigation confidence, weather resilience, and mental toughness. Underestimate it, and you risk a DNF or worse; putting additional strain on the event safety team.
If you bring the right preparation, however, you’ll be rewarded with an unforgettable experience.
More Than Just a Race
Ultimately, the Slate Trail Ultra is about more than distance. It’s about connection; to the landscapes of Snowdonia, to the communities that built its slate legacy, and to the runners who share the journey with you.
Every checkpoint passed, every slate village crossed, is a reminder of the lives and labours that shaped this part of Wales. By taking part, you’re not only testing your limits but also supporting the very communities the trail was created to serve.
Enter the Snowdonia Slate Trail Ultra
Entries are open for the 2025 edition of the Snowdonia Slate Trail Ultra – hurry though, as prices increase at the end of September. If you’re looking for a race that blends endurance with heritage, runnable trails with mountain weather, and history with hard miles, this is the one.
