THE ORIGINAL SNOWDONIA TRAIL MARATHON ERYRI
![Snowdonia Trail Marathon Eryri XTERRA World Championship header image](/imager/images/Llandudno/512228/Website-Hero-Image_3711eab92926eb9edb3d392d1d49a849.jpeg)
Events / Trail Running
XTERRA Snowdonia Trail Marathon Eryri 2025
Welcome to the XTERRA Snowdonia Trail Marathon Eryri, a stunning Trail Marathon, Ultra Marathon, Half Marathon and 10k, starting and finishing in Wales' outdoor capital, Llanberis. Entering the XTERRA Snowdonia Trail Marathon Eryri is your ticket to compete in one of the UK's most challenging trail races.
The incredible routes explore the trails, gorgeous panoramic views and tough climbs that make Eryri (Snowdonia) National Park so popular with outdoor enthusiasts. Visiting Rhyd Ddu, Beddgelert, Nant Gwynant, Pen y Pass, and Yr Wyddfa (Snowdon), there surely can't be a more striking trail marathon route in the UK!
The Snowdonia Trail Marathon & Half Marathon Eryri are the XTERRA Trail Run World Championship
The XTERRA Trail Run World Series connects the entire trail running community through a global rankings system, regional championships, and for those who qualify - the XTERRA Trail Run World Championship.
If you have qualified for the XTERRA World Championships, you will have received an invitation from XTERRA and will enter via XTERRAPlanet.com, we will add a link here when Championship places are open. For everyone wanting to take part in the open races, chose your distances from those available on our website.
The Ultra Marathon and Marathon are also both UTMB-indexed races.
Choose your distance
XTERRA Snowdonia Trail Marathon Eryri 2025
10k
12 Jul 2025
Run: 9.8km
![Snowdonia Trail Marathon Eryri Group](/imager/images/snowdonia-trail-marathon/355397/0227_07_1998_163408_5a6840b6d7c38d1a772a2314b556e3c7.jpeg 320w, /imager/images/snowdonia-trail-marathon/355397/0227_07_1998_163408_0d849ca85634cf74a376a0cc46e13224.jpeg 640w, /imager/images/snowdonia-trail-marathon/355397/0227_07_1998_163408_ebdbc42058feb3317567b21b3e3eaf37.jpeg 960w)
XTERRA Snowdonia Trail Marathon Eryri 2025
Half Marathon
12 Jul 2025
Run: 12.9miles
![Snowdonia Trail Marathon 2023 72](/imager/images/snowdonia-trail-marathon/568626/Snowdonia_Trail_Marathon_2023_72_2690b948f554ce8c918fb00a6ad4f50a.jpeg 320w, /imager/images/snowdonia-trail-marathon/568626/Snowdonia_Trail_Marathon_2023_72_1ce6dcb068d9941ff00b5785394294b5.jpeg 640w, /imager/images/snowdonia-trail-marathon/568626/Snowdonia_Trail_Marathon_2023_72_876d92b1554c3ec8269e4c9bc06fcd15.jpeg 960w)
XTERRA Snowdonia Trail Marathon Eryri 2025
Marathon
12 Jul 2025
Run: 27.3 miles
![Snowdonia Trail Marathon 2023 42](/imager/images/723078/Snowdonia_Trail_Marathon_2023_42_2690b948f554ce8c918fb00a6ad4f50a.jpeg 320w, /imager/images/723078/Snowdonia_Trail_Marathon_2023_42_1ce6dcb068d9941ff00b5785394294b5.jpeg 640w, /imager/images/723078/Snowdonia_Trail_Marathon_2023_42_876d92b1554c3ec8269e4c9bc06fcd15.jpeg 960w)
XTERRA Snowdonia Trail Marathon Eryri 2025
Ultra Marathon
12 Jul 2025
Run: 57km
What's Included
![Red Bull tent at the Snowdonia Ultra Trail Marathon Event](/imager/images/STM/354901/XTERRA_Snowdonia_TMS_2022_29_2690b948f554ce8c918fb00a6ad4f50a.jpeg 320w, /imager/images/STM/354901/XTERRA_Snowdonia_TMS_2022_29_1ce6dcb068d9941ff00b5785394294b5.jpeg 640w, /imager/images/STM/354901/XTERRA_Snowdonia_TMS_2022_29_876d92b1554c3ec8269e4c9bc06fcd15.jpeg 960w)
Lively Event Village
Music, commentary, shopping, food, kit demos and toilets
![XTERRA Snowdonia TMS 2022 Sunday 2](/imager/images/STM/355493/XTERRA_Snowdonia_TMS_2022_Sunday_2_2690b948f554ce8c918fb00a6ad4f50a.jpeg 320w, /imager/images/STM/355493/XTERRA_Snowdonia_TMS_2022_Sunday_2_1ce6dcb068d9941ff00b5785394294b5.jpeg 640w, /imager/images/STM/355493/XTERRA_Snowdonia_TMS_2022_Sunday_2_876d92b1554c3ec8269e4c9bc06fcd15.jpeg 960w)
Family Friendly Vibes
Family finishes and plenty to see and do
![Runner & Marshal on the Snowdonia Ultra Trail Marathon route, Snowdonia](/imager/images/STM/354903/XTERRA_Snowdonia_TMS_2022_Sunday_38_2690b948f554ce8c918fb00a6ad4f50a.jpeg 320w, /imager/images/STM/354903/XTERRA_Snowdonia_TMS_2022_Sunday_38_1ce6dcb068d9941ff00b5785394294b5.jpeg 640w, /imager/images/STM/354903/XTERRA_Snowdonia_TMS_2022_Sunday_38_876d92b1554c3ec8269e4c9bc06fcd15.jpeg 960w)
On Course Support
Friendly marshals, signage, energy stations and support vehicles
![Trail Marathon slate Mockup](/imager/images/Mementos/656468/Trail-Marathon-slate-Mockup_2690b948f554ce8c918fb00a6ad4f50a.jpeg 320w, /imager/images/Mementos/656468/Trail-Marathon-slate-Mockup_1ce6dcb068d9941ff00b5785394294b5.jpeg 640w, /imager/images/Mementos/656468/Trail-Marathon-slate-Mockup_876d92b1554c3ec8269e4c9bc06fcd15.jpeg 960w)
Unique Finisher Mementos!
Beautifully designed to reflect our event locations and local history.
![XTERRA Snowdonia TMS 2022 76](/imager/images/STM/355381/XTERRA_Snowdonia_TMS_2022_76_2690b948f554ce8c918fb00a6ad4f50a.jpeg 320w, /imager/images/STM/355381/XTERRA_Snowdonia_TMS_2022_76_1ce6dcb068d9941ff00b5785394294b5.jpeg 640w, /imager/images/STM/355381/XTERRA_Snowdonia_TMS_2022_76_876d92b1554c3ec8269e4c9bc06fcd15.jpeg 960w)
Spectacular Scenery
Unbeatable views across Eryri (Snowdonia)
![XTERRA Snowdonia TMS 2022 Sunday 26](/imager/images/STM/355495/XTERRA_Snowdonia_TMS_2022_Sunday_26_2690b948f554ce8c918fb00a6ad4f50a.jpeg 320w, /imager/images/STM/355495/XTERRA_Snowdonia_TMS_2022_Sunday_26_1ce6dcb068d9941ff00b5785394294b5.jpeg 640w, /imager/images/STM/355495/XTERRA_Snowdonia_TMS_2022_Sunday_26_876d92b1554c3ec8269e4c9bc06fcd15.jpeg 960w)
Professional Timing
Chip timing, and live online results
![Snowdonia Trail Marathon 2023 97](/imager/images/snowdonia-trail-marathon/568628/Snowdonia_Trail_Marathon_2023_97_c214996d4b93018b0bcddf1fb355726c.jpeg)
'Great organisation, awesome location, amazing stewards and route, and a brilliant event village feeling. One of the best races I have ever done!'
2023 Participant
Event Information
![23](/imager/images/STM/16401/23_6981c974322621d3404e73aa26da56dc.jpeg 100w, /imager/images/STM/16401/23_408aa2c41fdab63d3ec2be4594d8f498.jpeg 200w)
XTERRA Snowdonia Trail Marathon Eryri 2025
FAQs
![Slateman AT Royal Victoria](/imager/images/Slateman/37866/SlatemanAT_RoyalVictoria_6981c974322621d3404e73aa26da56dc.jpeg 100w, /imager/images/Slateman/37866/SlatemanAT_RoyalVictoria_408aa2c41fdab63d3ec2be4594d8f498.jpeg 200w)
XTERRA Snowdonia Trail Marathon Eryri 2025
Travel & Accommodation
![DSC 0219](/imager/images/STM/16427/DSC_0219_6981c974322621d3404e73aa26da56dc.jpeg 100w, /imager/images/STM/16427/DSC_0219_408aa2c41fdab63d3ec2be4594d8f498.jpeg 200w)
XTERRA Snowdonia Trail Marathon Eryri 2025
Info for Locals
![IMG 3790](/imager/images/Sandman/7473/IMG_3790_6981c974322621d3404e73aa26da56dc.jpeg 100w, /imager/images/Sandman/7473/IMG_3790_408aa2c41fdab63d3ec2be4594d8f498.jpeg 200w)
XTERRA Snowdonia Trail Marathon Eryri 2025
Volunteer
![0110 Finish 6113](/imager/images/STM/16406/0110_Finish_6113_6981c974322621d3404e73aa26da56dc.jpeg 100w, /imager/images/STM/16406/0110_Finish_6113_408aa2c41fdab63d3ec2be4594d8f498.jpeg 200w)
XTERRA Snowdonia Trail Marathon Eryri 2025
Gallery
![DWP7034](/imager/images/STM/16392/DWP7034_6981c974322621d3404e73aa26da56dc.jpeg 100w, /imager/images/STM/16392/DWP7034_408aa2c41fdab63d3ec2be4594d8f498.jpeg 200w)
XTERRA Snowdonia Trail Marathon Eryri 2025
Race Reports
We are proud that all our events are bilingual. Signs, registration and commentary are available in English and Welsh.
Event Partners
Working with local communities
Looking after our environment
Find out more about Looking after our environmentTees for Trees
Find out more about Tees for Trees