The Snowdonia Sea2Sky is a spectacular annual trail running event held in the heart of North Wales, where participants race from the sea level to the summit of the famous Snowdon mountain. With race distances including a 10K, half marathon, and marathon, the event offers runners of all levels the opportunity to tackle challenging courses through some of the most breathtaking landscapes in the UK. The routes take participants through rugged trails, steep ascents, and panoramic views of both the coastline and the majestic mountains of Snowdonia National Park. Known for its awe-inspiring scenery and tough terrain, the Snowdonia Sea2Sky is a true test of endurance and a must-do for trail running enthusiasts.
Races
53km
25km
Race Date:
06 September, 2025
The Snowdonia Sea2Sky 53km ultra-marathon features a demanding 1,632-meter elevation gain, guiding runners from the golden sands of Barmouth Beach to the rugged summit of Cadair Idris and back. Organized by RunThrough Trails, this race on September 6, 2025, offers an unparalleled trail running experience through some of Wales’ most breathtaking terrains.
Weather based on historical averages.
FAQs
What is the Snowdonia Sea2Sky?
How long is the Snowdonia Sea2Sky?
Where does the Snowdonia Sea2Sky take place?
What is the elevation gain of the Snowdonia Sea2Sky?
How can I prepare for the Snowdonia Sea2Sky?
How do I choose the right training plan for the Snowdonia Sea2Sky?
The Snowdonia Sea2Sky 53km ultra-marathon features a demanding 1,632-meter elevation gain, guiding runners from the golden sands of Barmouth Beach to the rugged summit of Cadair Idris and back. Organized by RunThrough Trails, this race on September 6, 2025, offers an unparalleled trail running experience through some of Wales’ most breathtaking terrains.
The Snowdonia Sea2Sky is 53km long.
The Snowdonia Sea2Sky takes place in Barmouth, Gwynedd, Wales, UK.
The Snowdonia Sea2Sky elevation gain is 1632 metres, which Runna classifies as a Hilly race.
The best way to train for the next race is to use a personalised training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalised training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Snowdonia Sea2Sky?
The Snowdonia Sea2Sky 53km ultra-marathon features a demanding 1,632-meter elevation gain, guiding runners from the golden sands of Barmouth Beach to the rugged summit of Cadair Idris and back. Organized by RunThrough Trails, this race on September 6, 2025, offers an unparalleled trail running experience through some of Wales’ most breathtaking terrains.
How long is the Snowdonia Sea2Sky?
The Snowdonia Sea2Sky is 53km long.
Where does the Snowdonia Sea2Sky take place?
The Snowdonia Sea2Sky takes place in Barmouth, Gwynedd, Wales, UK.
What is the elevation gain of the Snowdonia Sea2Sky?
The Snowdonia Sea2Sky elevation gain is 1632 metres, which Runna classifies as a Hilly race.
How can I prepare for the Snowdonia Sea2Sky?
The best way to train for the next race is to use a personalised training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the Snowdonia Sea2Sky?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalised training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
More
Sport:
Running
Tags:
Coastal
This event listing is for informational purposes only. Runna is not affiliated with, endorsed by, or sponsored by Snowdonia Sea2Sky 2025 or RunThrough. All event details are based on publicly available information and are provided solely to help users discover running events. Runna does not use any official logos, images, or proprietary content from this event or its organiser. Any trademarks or names mentioned are used descriptively to identify the event in a factual manner. For the most accurate and up to date information (including to register or purchase an entry to the event), please visit the Snowdonia Sea2Sky 2025 website.
