Distance
77 KM
Elevation Gain
2575 M+
Start Date
Friday 15th May 2026
Race Start
Caernarfon - 20:00
Max Allowed Race Time
16 Hours
Go from sea to mountains in this unique trail race ending in Eryri (Snowdonia) National Park
A new 80K race joins the Ultra-Trail Snowdonia by UTMB programme, offering a tough and rewarding journey from coast to mountains. The 77km route climbs 2,575m, starting at sea level in Caernarfon before heading inland into the mountains in the heart of Eryri. The course links coastal paths, remote trails and high mountain ground, capturing the scale and variety of North Wales.
The race starts at 8pm on Friday 15 May, sending runners out from the coast and into the night as they work their way towards the mountains. Finishers will earn 3 Running Stones, making them eligible for the Hoka UTMBB Mont-Blanc lottery. Built for experienced trail runners, this is a race that demands steady effort, good judgement and respect for the terrain. A true test from the shoreline to the high peaks.
The top 3 runners will not get automatic qualification to UTMB World Series Finals.
MANDATORY KIT
Your mandatory kit (clothing and equipment) will be checked when you arrive at registration to collect your race bib and at the start of your race. You will be asked to show all of the kit requirements for your competition and have these items inspected by a member of the Event Team.
If you do not have an item of clothing or equipment which is mandatory for your race, you will not receive your race bib, will not be allowed to compete, and will be disqualified from the race.
As dusk falls, the race unfolds beneath the shadow of Caernarfon Castle, its ancient walls watching as runners move from the edge of the sea toward the mountains beyond. A fast, runnable opening encourages an early rhythm before the terrain begins to rise and the route draws you into the heart of Eryri (Snowdonia).
The course passes through landscapes shaped by slate mining heritage, following historic paths and quarry tracks deeper into the mountains. The climb to Yr Wyddfa (Snowdon) is the defining test; steep, exposed, and unforgettable.
From the high point, the route weaves past tranquil llyns and through ancient woodland, demanding focus as runners through the night and fatigue sets in. The final miles release into a fast descent, carrying runners toward a powerful finish in Llanberis, completing a true journey from coast to summit and through the mountains of Eryri (Snowdonia).
Aid stations are available at strategic locations and regular intervals along the course. These provide basic food and drink options and shelter from the elements.
Larger aid stations will be well stocked with hot food options, hot drinks and a selection of other snacks including cold drinks, water, cola and Näak Energy products.
There are toilet facilities at all locations (including women's toilets and toilets with period products). Most larger aid stations are located in existing buildings or marquees, are warm, and will have seating and rest areas.
UTS 80K is a semi-autonomous / self-sufficient event with aid stations and medical cover at strategic locations on the course. However, due to the extent of the course we strongly advise you to have your own support crew. Your support crew will be able to provide you with personal assistance at designated locations. Due to the remote nature of some aid stations, and the lack of easily accessible car parking, we have to be very selective of which locations we can allow personal assistance.
We strongly advise you to have a supporter to drive you home after the event. Due to the fatigue of completing Ultra-Trail Snowdonia by UTMB, runners should not attempt to drive themselves home.