Articles

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Snowdonia Trail Marathon Eryri

Name: Snowdonia Trail Marathon Eryri
Start: 2026-07-12
End: 2026-07-12
Location: Llanberis

Llanberis, United Kingdom • 12 Jul 2026

Snowdonia Trail Marathon Eryri 2026, organized by Always Aim High Events, is staged in Snowdonia National Park with the start and finish in Llanberis. Participants can choose Ultra Marathon, Marathon, Half Marathon, or 10k. The course threads mountain trails, forest paths, and rugged climbs through iconic Welsh landscapes, taking in Rhyd Ddu, Beddgelert, Nant Gwynant, Pen y Pass, and Yr Wyddfa (Mount Snowdon) — Wales’ highest peak. Billed as one of the UK’s most scenic and challenging trail races, the event offers a mix of awe-inspiring scenery, varied terrain, and a welcoming, adventure-focused atmosphere that attracts trail runners from around the world. Visit the organization's website for the most recent information.

United Kingdom Wales Llanberis

Race information

Website Registration

UTMB 20K UTMB 50K

42 km

Marathon

21 km

Half Marathon

10 km

10k

Ultra Marathon

Visit the organization's website for the most recent information.

Trail runs nearby

Saturday Sep 20

Abersoch Half Marathon

Abersoch - 25 mi from Llanberis

13 mi

The 361° Abersoch Half Marathon takes place in the seaside village of Abersoch on Wales’ Llyn Peninsula. The 13.1-mile course is predominantly road-based, with a final kilometer along Abersoch Beach to a lively finish crowd. Runners pass through Llanengan, Llangian and Sarn Bach, with drink stations..

Saturday Sep 20

The Brutal Extreme Triathlon

Llanberis

0 km

The Brutal Extreme Triathlon takes place in Llanberis, North Wales, starting at Lake Padarn. The event offers Canol (Half), Mawr (Full), Cawr (Double), and Triple distances, with a 1.25 km swim in Llyn Padarn, a 28-mile bike loop through dramatic Welsh scenery, and lake laps totaling about 5 miles,..

Sunday Nov 9

Anglesey Trail Half Marathon

Llanfairpwllgwyngyll - 8 mi from Llanberis

10 km

21 km

Anglesey Trail Half Marathon & 10k 2025 takes place in Newborough Forest and Traeth Llanddwyn on Anglesey, UK. The event offers two trail distances: a 10-kilometre route and a half-marathon (21.1km). Runners traverse forest trails, single-track paths, and sandy sections with views of the Llyn Penins..

Sat - Sun Nov 15-16

Slate Trail Ultra

Bangor - 7 mi from Llanberis

88 km

145 km

The Slate Trail Ultra, organized by APEX Running, is a challenging trail running event set in the scenic Snowdonia region of Wales. It offers two main distances: a 145km (90mi) ultra with 3,900m+ elevation gain and an 88km (55mi) Ultra Tour of the Quarries with 2,700m+ elevation gain. The course fol..

UTMB Index

Sunday Nov 16

Guided Trail Run - Dolwyddelan

Dolwyddelan - 11 mi from Llanberis

10 km

The Guided Trail Run in Dolwyddelan offers participants a scenic 10km route beginning in the charming village. The run features a leisurely start along the river, followed by a climb to Ty Mawr, where runners can enjoy stunning views of the village below. The course winds through beautiful forested..

Saturday Mar 14

Beast Of The Blacks

Llanbedr - 20 mi from Llanberis

10 mi

20 mi

40 mi

The Beast of the Blacks is a trail running event held on Saturday 14 March 2026 from Llanbedr Hall, Nr Crickhowell, Powys (NP8 1SR). The event offers three marked routes with GPX files available: 11 miles / 17 km 20 miles / 32.5 km 40 miles / 65 km Minimum age to enter is 17. Entry fees listed ar..