The Ultimate Ultra Trail Endurance Race
![Runner ascending Snowdon with Llyn Du'r Arddu in the background](/imager/images/snowdon24/354900/XTERRA_Snowdonia_TMS_2022_95_3711eab92926eb9edb3d392d1d49a849.jpeg)
Events / Trail Running
Black Diamond Yr Wyddfa | Snowdon24 2025
Yr Wyddfa (Snowdon), is the highest mountain in Eryri (Snowdonia), and also the whole of England and Wales. It peaks at an impressive 1,085 m (3,560 feet).
Starting and finishing at the foot of this iconic mountain, you will be challenged as an individual, or part of a team, to ascend and descend Yr Wyddfa as many times as possible in 24 hours.
Categories for solo runners, pair relay and team (up to 5) relay. Pair and team entries receive one timing chip, meaning only one person will be running at one time.
Being UTMB Indexed, this is also a great qualifying or preparation race for UTMB Mont Blanc. The individual challenges mean that there is a 50k, 100k and 100m mile UTMB indexed challenge.
Race and Route Information
Black Diamond Yr Wyddfa | Snowdon24 Ultra Trail 2025
24 hour
12 Jul - 13 Jul 2025
Run: As far as you can!
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
Toilets, food, shopping, music and commentary during daylight hours.
![XTERRA Snowdonia TMS 2022 Saturday 125](/imager/images/STM/354902/XTERRA_Snowdonia_TMS_2022_Saturday_125_2690b948f554ce8c918fb00a6ad4f50a.jpeg 320w, /imager/images/STM/354902/XTERRA_Snowdonia_TMS_2022_Saturday_125_1ce6dcb068d9941ff00b5785394294b5.jpeg 640w, /imager/images/STM/354902/XTERRA_Snowdonia_TMS_2022_Saturday_125_876d92b1554c3ec8269e4c9bc06fcd15.jpeg 960w)
Rest Areas
Silent respite area, tent pitches and chill out zone
![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 and Mountain Leader support.
![Yr Wyddfa24 Slate Mockup](/imager/images/Mementos/656536/Yr-Wyddfa24-Slate-Mockup_2690b948f554ce8c918fb00a6ad4f50a.jpeg 320w, /imager/images/Mementos/656536/Yr-Wyddfa24-Slate-Mockup_1ce6dcb068d9941ff00b5785394294b5.jpeg 640w, /imager/images/Mementos/656536/Yr-Wyddfa24-Slate-Mockup_876d92b1554c3ec8269e4c9bc06fcd15.jpeg 960w)
Unique Finisher Mementos!
Beautifully designed to reflect our event locations and local history.
![Runner on the Ultra Trail in Snowdonia, going uphill.](/imager/images/STM/354904/XTERRA_Snowdonia_TMS_2022_94_2690b948f554ce8c918fb00a6ad4f50a.jpeg 320w, /imager/images/STM/354904/XTERRA_Snowdonia_TMS_2022_94_1ce6dcb068d9941ff00b5785394294b5.jpeg 640w, /imager/images/STM/354904/XTERRA_Snowdonia_TMS_2022_94_876d92b1554c3ec8269e4c9bc06fcd15.jpeg 960w)
Spectacular Scenery
Unbeatable views across Eryri (Snowdonia)
![Finish line photograph from the Snowdonia Trail Marathon & Snowdon24 Ultra Trail Challenge](/imager/images/STM/354905/XTERRA_Snowdonia_TMS_2022_Sunday_101_2690b948f554ce8c918fb00a6ad4f50a.jpeg 320w, /imager/images/STM/354905/XTERRA_Snowdonia_TMS_2022_Sunday_101_1ce6dcb068d9941ff00b5785394294b5.jpeg 640w, /imager/images/STM/354905/XTERRA_Snowdonia_TMS_2022_Sunday_101_876d92b1554c3ec8269e4c9bc06fcd15.jpeg 960w)
Professional Timing
Chip timing, tracking and online results
![Charity runners on the Snowdon24 ultra trail snowdon challenge.](/imager/images/snowdon24/439304/XTERRA_Snowdonia_TMS_2022_72_6bc054a4389b344baa47bc10d4c5fd32.jpeg)
If you are looking for a challenge, as a team or as an individual and want to see how far your mind and body can go, this is a must-do race to add to the bucket list!
2022 Participant
Event Information
![XTERRA Snowdonia TMS 2022 40](/imager/images/STM/355232/XTERRA_Snowdonia_TMS_2022_40_2022-07-12-142101_kkkx_6981c974322621d3404e73aa26da56dc.jpeg 100w, /imager/images/STM/355232/XTERRA_Snowdonia_TMS_2022_40_2022-07-12-142101_kkkx_408aa2c41fdab63d3ec2be4594d8f498.jpeg 200w)
Black Diamond Yr Wyddfa | Snowdon24 2025
FAQs
![Slateman AT Royal Victoria](/imager/images/Slateman/37866/SlatemanAT_RoyalVictoria_6981c974322621d3404e73aa26da56dc.jpeg 100w, /imager/images/Slateman/37866/SlatemanAT_RoyalVictoria_408aa2c41fdab63d3ec2be4594d8f498.jpeg 200w)
Black Diamond Yr Wyddfa | Snowdon24 2025
Travel & Accommodation
![DSC 0219](/imager/images/STM/16427/DSC_0219_6981c974322621d3404e73aa26da56dc.jpeg 100w, /imager/images/STM/16427/DSC_0219_408aa2c41fdab63d3ec2be4594d8f498.jpeg 200w)
Black Diamond Yr Wyddfa | Snowdon24 2025
Info for Locals
![IMG 3790](/imager/images/Sandman/7473/IMG_3790_6981c974322621d3404e73aa26da56dc.jpeg 100w, /imager/images/Sandman/7473/IMG_3790_408aa2c41fdab63d3ec2be4594d8f498.jpeg 200w)
Black Diamond Yr Wyddfa | Snowdon24 2025
Volunteer
![XTERRA Snowdonia TMS 2022 76](/imager/images/STM/355381/XTERRA_Snowdonia_TMS_2022_76_6981c974322621d3404e73aa26da56dc.jpeg 100w, /imager/images/STM/355381/XTERRA_Snowdonia_TMS_2022_76_408aa2c41fdab63d3ec2be4594d8f498.jpeg 200w)
Black Diamond Yr Wyddfa | Snowdon24 2025
Gallery
![Snowdonia Trail Marathon Eryri Group](/imager/images/snowdonia-trail-marathon/355397/0227_07_1998_163408_cde842c4dd89da3f8adb2ba4a0579caf.jpeg 100w, /imager/images/snowdonia-trail-marathon/355397/0227_07_1998_163408_6989cfeab78b726cd91b3430efe8d5da.jpeg 200w)
Black Diamond Yr Wyddfa | Snowdon24 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
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