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Routes
Mountain biking trails
United Kingdom
Wales
North Wales
Gwynedd
Llanfihangel-Y-Pennant

Cadair Idris Trail

Hard

5.0

(5)

126

riders

Cadair Idris Trail

02:46

25.8km

930m

Mountain biking

This difficult 16.0-mile mountain biking route on Cadair Idris offers technical terrain and stunning views in Eryri (Snowdonia) National Par

Last updated: February 26, 2026

Tips

Includes very steep uphill segments

You may need to push your bike.

After 8.17 km for 1.03 km

After 10.0 km for 2.75 km

Waypoints

A

Start point

Parking

Get Directions

1

523 m

Abergynolwyn to Post Ystumanner Trail

Highlight (Segment) • Forest

This trail is a load of fun ridden in either direction.

The climbs aren't too steep, there's an entertaining amount of exposure with the river falling steeply off to one …

Tip by

2

12.8 km

Complex and striking, Cadair Idris is the Yr Wyddfa (Snowdon) of southern Eryri (Snowdonia): a honeypot mountain renowned for its imperious cliffs, enticing ridges and pretty tarns. It is a …

Tip by

3

13.0 km

Descent from Cadair Idris Summit

Highlight (Segment) • Summit

This is an hideous carry/push along the plateau to the summit, but if you like it slatey and rocky and technical, you'll find much to enjoy here on the way …

Tip by

B

25.8 km

End point

Parking

Loading

Way Types & Surfaces

Way Types

10.3 km

9.24 km

6.23 km

< 100 m

Surfaces

11.5 km

10.2 km

3.59 km

381 m

< 100 m

< 100 m

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Elevation

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Highest point (850 m)

Lowest point (20 m)

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Weather

Powered by Foreca

Tuesday 5 May

13°C

5°C

16 %

Additional weather tips

Max wind speed: 2.0 km/h

to get more detailed weather forecasts along your route

This route was planned by komoot.

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Frequently Asked Questions

Is mountain biking Cadair Idris suitable for beginners?

No, this trail is generally considered difficult and is not suitable for novices. It's best suited for intermediate-plus riders who are comfortable with technical natural riding. You'll encounter steep, rocky climbs, technical descents, and likely some 'hike-a-bike' sections where you'll need to push or carry your bike.

What is the terrain like for mountain biking on Cadair Idris?

The terrain is varied and technical. Expect steep, rocky climbs, often requiring you to push your bike. Some sections, like near the Pony Path, are described as 'steep, rocky, boulder fields'. The path can have 'paved' sections of igneous rock, which can be challenging with sharp edges. Descents are fast and technical, over bedrock, boulder, and shale. Short grass can be very slippery, even with slight moisture, leading to unpredictable grip.

What is the most legitimate mountain biking route to the summit of Cadair Idris?

The most legitimate route for mountain bikers to reach the summit and descend is via the bridleway from Llanfihangel-y-Pennant. Other routes are generally footpaths and not suitable for bikes.

What kind of views can I expect while mountain biking Cadair Idris?

You can expect stunning panoramic scenery throughout the ride. The mountain itself is striking, with imperious cliffs, enticing ridges, and pretty tarns. From higher elevations, there are spectacular views out to the sea and of the mountain's northern face. A circuit around Cadair Idris offers 'jaw-dropping' views, especially from the high bwlch (col) of Esgair Berfa.

What highlights or landmarks can I see along the mountain biking route?

The route offers several notable highlights. You'll pass through the Abergynolwyn to Post Ystumanner Trail, experience the challenge of reaching the Penygadair summit, Cadair Idris, and navigate the thrilling Descent from Cadair Idris Summit.

When is the best time of year to mountain bike Cadair Idris?

The best time to mountain bike Cadair Idris is typically during the drier months, from late spring to early autumn (May to September). This avoids the worst of winter weather and potentially very slippery conditions. Always check the weather forecast before you go, as conditions can change rapidly on the mountain.

Are there any specific regulations or permits needed for mountain biking in Eryri (Snowdonia) National Park?

Generally, you do not need a specific permit to mountain bike on designated bridleways within Eryri (Snowdonia) National Park. However, it's crucial to stick to bridleways and public rights of way where cycling is permitted. Always follow the Countryside Code, respect the environment, and be mindful of other trail users. There are no entrance fees for the National Park itself.

Is Cadair Idris mountain biking dog-friendly?

While dogs are generally welcome in Eryri (Snowdonia) National Park, mountain biking on Cadair Idris is a challenging and technical route. If you choose to bring your dog, ensure they are fit enough for long, strenuous climbs and descents, and that they are kept under close control, preferably on a lead, especially around livestock and other trail users. Consider the rocky and potentially sharp terrain on their paws.

Where is the best place to park for mountain biking Cadair Idris?

For the most legitimate mountain biking route to the summit, parking near Llanfihangel-y-Pennant would be appropriate to access the bridleway. Specific parking areas can vary, so it's advisable to check local signage or online resources for designated parking spots before your visit.

What makes Cadair Idris a unique mountain biking experience?

Cadair Idris offers a true 'big mountain' experience, distinct from dedicated trail centers, with wilder, natural trails. It's often seen as a good 'starter mountain' for riders looking to progress to larger mountain ascents and descents like Snowdon, as the hardest technical sections are at the top. Its combination of significant climbs, technical descents, and hike-a-bike sections makes it a unique and iconic challenge in Mid Wales.

Does this trail intersect other well-known paths?

Yes, the route also passes through sections of the Cambrian Way, the Mynydd Moel-Tyrrau Mawr ridge walk, and the Pony Path.

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