RunThrough Snowdonia Sea2Sky

Barmouth, United Kingdom • 6 Sep 2025

The RunThrough Snowdonia Sea2Sky Trail Races, held in September 2025 at Barmouth, UK, offer two challenging distances: 25k and 53k. Set in the stunning landscape of Snowdonia, participants can enjoy breathtaking trail views throughout the course. The event features a chip-timed, marshalled route with water stations to support runners. Finishers receive a bespoke medal, post-race snacks, and free event photography. This trail race promises an exhilarating experience for trail running enthusiasts, combining natural beauty with well-organized race logistics. Visit the organization's website for the most recent information.

Race information

UTMB 20K UTMB 50K
53 km
53k
25 km
25k
Visit the organization's website for the most recent information.
Trail runs nearby

The MTC Hafren Ultra is a challenging 27-mile point-to-point ultra marathon held in Wales, starting at Rhyd-y-benwch picnic area and finishing at the Mid Wales Arts Centre in Caersws. The race begins with a demanding four-mile mountain trek up Plynlimon, known as Wales' most dangerous mountain due t..

The Ultra-Trail Snowdonia by UTMB is a renowned trail running event held in the rugged landscapes of North Wales. As part of the UTMB® World Series, it features challenging courses with distances ranging from 25 km to 168 km, including significant elevation gains up to 9,500 meters. The event attrac..

UTMB Index

The Black Mountains 50 is a challenging trail running event held at Longtown Village Hall, Herefordshire, serving as the gateway to the Black Mountains. It features four distances: a 50-mile ultra, 32-mile ultra, marathon, and half marathon, all requiring self-navigation with GPX files and maps prov..

SkyRun Eryri® is Wales' premier skyrunning event held in the iconic Snowdonia (Eryri) region, starting from Rhyd-Ddu. The event features four challenging races ranging from 16 km to 52 km, including the 38 km Snowdon SkyRace and the 52 km 14 Peaks Ultra. Participants experience significant elevation..

UTMB Index

Ultra Wales 50 is a challenging 50-mile mountain and trail race held in Coed-y-Brenin, Southern Snowdonia, Wales. Featuring 2,898 meters of ascent, the course includes iconic landmarks such as Cadair Idris Penygader (893m), Rhinog Fach (712m), Dolgellau, the Barmouth estuary, and the expansive Coed-..

UTMB Index

The Welsh 3000's Ultra Run is a guided mountain running event held in Snowdonia, North Wales, covering the classic 15 peaks over 3,000 feet. Spanning approximately 30 miles (50 km) with 4,000 meters of elevation gain, the route traverses the Carneddau, Glyderau, and Snowdon ranges, including the cha..