Caernarfon
Trail Running Calendar near Caernarfon 2026-2027
Explore the top trail runs near Caernarfon for 2026-2027! We've gathered 35 exciting trail runs in the area. Check out our detailed list below to find your next local trail run.
August 2026
A very short but steep mountain race on Tryfan near Bethesda, with exposed rocky terrain and expert navigation required. Minimum age over 18 and a £1 entry fee supports Ogwen Mountain Rescue.
A hill race near Porthmadog covering 7.2 km with 564 m of ascent, partially marked and requiring navigational skills and experience. Entry is day only for £5 and teams may enter free.
A 9 mile fell race with about 2,800 ft of ascent visiting Tal y Fan and Moel Lus, featuring five ordered checkpoints and a cut off at CP2. Entry is limited to 100 and online registration opens 1/6/26.
September 2026
Coastal ultra events on Anglesey offering a 130-mile clockwise island circumnavigation and a separate ~47-mile coastal route along the Isle of Anglesey Coastal Path.
A 102 mile self navigation ultramarathon across Snowdonia Eryri with 5,172 m of ascent, 11 checkpoints and a 42 hour cut off. Entrants need prior 50 mile ultramarathon experience, mandatory mountain kit and GPS tracking.
A 45 mile mountain ultramarathon around Snowdonia based at Betws y Coed with ridge trails, five staffed checkpoints and live GPS tracking. Entry for 2026 is full and participants must meet qualifying criteria and carry mandatory mountain kit.
A six day, 380 km mountain ultra across Wales with mandatory navigation, GPS tracking and overnight camps along a single routed course.
Guided run over the 15 Welsh 3,000 ft peaks in Snowdonia, covering about 30 miles and 4,000 m ascent with support and catering.
An 8 km mountain race over the three peaks of the Eifl near Pwllheli with about 490 m of ascent. Main race for over 16s with entry on the day £10; junior races are held with a £3 entry.
Coastal trail races in Abersoch on the Llyn Peninsula offering 20K and 10K routes plus beach runs, chip timing, drink stations and a beach finish with music and prizes.
Multi-distance triathlons around Llyn Padarn with a mountain section on Snowdon. Solo and team entries available, with mandatory support crew for double and triple distances and compulsory safety kit for all athletes.
Ras Pedol Peris is an AL Welsh fell race in Eryri near Llanberis with full 28 km and half 14 km routes over several mountain summits on 19 September 2026.
A multi day 286 km mountain race across Wales with solo and team entries, five indoor checkpoints and a 108 hours time limit.
A fully waymarked, supported sea to summit ultramarathon from Caernarfon Castle to Bron y Feds Uchaf covering 29 miles and 5600 ft of ascent.
October 2026
Bike and run events on Harlech Beach with sand-surface courses, relay options, and distances from short runs to combined bike-run races on 18 October 2026.
A guided 13 km loop around Llyn Trawsfynydd in Southern Snowdonia on runnable trails with limited ascent and regular regrouping stops.
November 2026
Trail running in Newborough Forest and Llanddwyn Island with 10k and half marathon options, chip timing and on course support.
A winter coast to coast ultra on the Llŷn Peninsula on 7 November 2026, with solo 37.5 mile and team of four entry options, organised by Pen Llŷn Ultras and offering age 16 plus eligibility and several entry extras.
Held in Porth Penrhyn, Bangor on 14-15 November 2026, Slate Trail Ultra offers two trail races of 147 km and 80 km along the Snowdonia Slate Trail with substantial elevation gain and organised aid stations.