Trail Running in Snowdonia
Where the trails are as tough as they are beautiful.
1 Adventures
Where the trails are as tough as they are beautiful.
Snowdonia. The name itself conjures images of jagged peaks, demanding climbs, and weather that can turn on a dime. It's precisely these elements that make it a mecca for trail running. Forget your manicured forest trails – this is where you test yourself against the mountain.
Snowdonia isn't for the faint of heart. We're talking proper mountain running, often over technical terrain. Expect steep ascents, rocky descents, and the ever-present possibility of navigating in low visibility. But the rewards are immense. The views are breathtaking, the sense of accomplishment is unparalleled, and the camaraderie amongst runners is strong. From the iconic Snowdon Race route to the wild traverse of the Carneddau, the challenge is real.
Whether you're a seasoned skyrunner chasing vertical gain or a confident road runner looking to take your first steps into the mountains, Snowdonia offers a spectrum of routes. Start with gentler loops in Coed y Brenin before tackling the bigger peaks. Respect the mountains, prepare properly, and you'll discover some of the most rewarding trail running in the UK. Be warned though; these routes are not always well-marked, and navigation skills are essential, especially in poor weather. The key to enjoying trail running snowdonia is to go prepared, know your limits, and respect the mountain.
Best Spots for Trail Running in Snowdonia
8 spots ranked by our team. Each one researched, visited, and honestly reviewed.
Snowdon Summit Race Route
The classic. Starting in Llanberis, this relentlessly steep route climbs directly to the summit of Snowdon. The terrain is a mix of paved road, rocky paths, and loose scree near the top. It's brutal but iconic, and on a clear day, the views are unmatched. Be prepared for crowds, especially during peak season.
Best for: Experienced trail runners seeking a challenging climb and iconic views.
Llanberis has several car parks (e.g. Coed y Glyn, Station Road), but they fill up very early. Expect to pay £5-10. Arrive before 7am in summer or park further out and walk in.
Get directions to Llanberis High StreetInsider tip: For a quieter (but longer) ascent, try the Llanberis Path early or late in the day.
Moel Siabod Circuit
A less crowded alternative to Snowdon, Moel Siabod offers stunning views and varied terrain. This circuit involves some scrambling (Grade 1), especially on the descent, so confidence with hands-on rock is essential. The views from the summit are exceptional, encompassing the Glyderau and Snowdon.
Best for: Experienced trail runners comfortable with scrambling.
Small car park near Bryn Glo Cafe (limited spaces). Arrive early or park in Capel Curig and run to the trailhead (adds distance).
Get directions to Bryn Glo Cafe, Capel CurigInsider tip: The scrambling section is much easier to ascend than descend. Consider doing the route in reverse if you're unsure of your scrambling ability.
Glyderau Ridge Run
A classic Snowdonia traverse, this route takes you along the dramatic Glyderau ridge, including Glyder Fawr and Glyder Fach. Expect technical terrain, exposed sections, and stunning views (if the weather cooperates!). Navigation skills are crucial, especially in poor visibility. Don't underestimate the 'Cannon Stone'.
Best for: Very experienced mountain runners with excellent navigation skills.
Ogwen Cottage car park (very popular, fills up quickly). Alternatively, park along the A5 and walk in.
Get directions to Ogwen CottageInsider tip: Check the weather forecast religiously. This ridge is extremely exposed and dangerous in strong winds or rain. Carry a bothy bag for emergencies.
Carneddau Traverse
A remote and challenging traverse of the Carneddau range. This route offers a true mountain experience, with fewer crowds and wilder terrain than Snowdon. Expect long distances, significant elevation gain, and complex navigation. It's a serious undertaking.
Best for: Experienced mountain runners seeking a remote and challenging adventure.
Several parking spots available along the A5 near Bethesda or in Gerlan. Check for restrictions.
Get directions to GerlanInsider tip: Carry extra food and water. There are no facilities along the route. Download offline maps to your phone/GPS device as signal is patchy.
Coed y Brenin Trail Runs
A network of purpose-built trails through the forest, Coed y Brenin offers a variety of options for all abilities. Marked trails, smooth surfaces, and less exposure make it a great place to start trail running or for an easier day out. Check out the 'Dragons Back' for a challenging but rewarding run.
Best for: Beginners, families, and those looking for well-maintained trails.
Coed y Brenin Visitor Centre (parking charges apply).
Get directions to Coed y Brenin Visitor CentreInsider tip: Download a map of the trails before you go. While they're well-marked, it's easy to get turned around. The cafe at the visitor center is excellent for post-run refueling.
Nant Gwynant Loops
Beautiful valley scenery with a range of trail options. You can combine sections of the Watkin Path with valley trails for varied loops. The valley floor offers relatively gentle running, while the Watkin Path provides a challenging ascent towards Snowdon.
Best for: Runners looking for a mix of valley and mountain running.
Limited parking available along the road in Nant Gwynant. Be respectful of residents and avoid blocking access.
Get directions to Nant GwynantInsider tip: Combine a run with a dip in Llyn Gwynant for a refreshing post-run treat (if you're brave enough!).
Cwm Idwal to Devil's Kitchen
A stunning run into the heart of Cwm Idwal, a classic glacial cirque. The path climbs steeply to the Devil's Kitchen (Twll Du), a dramatic cleft in the cliffs. The terrain is rocky and uneven, but the scenery is spectacular. Be prepared for strong winds in the cirque.
Best for: Experienced trail runners seeking dramatic scenery and a challenging climb.
Ogwen Cottage car park (very popular, fills up quickly). Alternatively, park along the A5 and walk in.
Get directions to Ogwen CottageInsider tip: Take a moment to appreciate the unique geology of Cwm Idwal, a National Nature Reserve. Look out for rare arctic-alpine plants.
Aber Falls Trail
A relatively easy and accessible trail leading to the impressive Aber Falls. The path is well-maintained and offers beautiful views of the valley. It's a good option for a shorter run or for those looking for a less challenging route.
Best for: Beginners, families, and those looking for a scenic and accessible trail run.
Aber Falls car park (small charge applies).
Get directions to Aber Falls Car ParkInsider tip: Visit after heavy rain for the most impressive display from the falls. Extend the run by exploring the trails further up the valley.
Need to Know
Weather
Snowdonia's weather is notoriously unpredictable. Conditions can change rapidly from sunshine to rain, wind, and even snow, especially at higher elevations. Check the mountain forecast before you go and be prepared for all eventualities. Strong winds and low visibility can make navigation extremely difficult and dangerous.
Gear Checklist
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Local Gear Shops
Joe Brown's
Menai Hall, Llanberis, Gwynedd LL55 4EN
An iconic mountaineering shop with a wide range of equipment and clothing. Known for its expert advice and historical significance.
V12 Outdoor
45 High St, Llanberis, Caernarfon LL55 4EU
Another excellent outdoor shop in Llanberis, offering a wide selection of trail running gear and clothing. Friendly staff and a good range of brands.
Run Wales
Unit 1 Cibyn Industrial Estate, Caernarfon LL55 2BD
Specialising in running gear. Excellent knowledge of running shoes and form.
Events & Races
Snowdon Race
July • race • £45
An iconic fell race from Llanberis to the summit of Snowdon and back. A challenging and prestigious event.
More info →Mynydd Du Mountain Marathon
June • race • £55
A challenging mountain marathon in the Carneddau range.
More info →Frequently Asked Questions
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About Trail Running
What to Expect
Trail Running offers an incredible way to explore the natural beauty of Snowdonia.
Requirements
Most trail running experiences are suitable for beginners, but a reasonable level of fitness is recommended.