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Hiking trails & Routes
South Wales
Tongwynlais

Castle Coch and Craig Yr Allt loop

Routes
Hiking trails & Routes
South Wales
Tongwynlais

Castle Coch and Craig Yr Allt loop

Moderate

3.8

(22)

123

hikers

Castle Coch and Craig Yr Allt loop

02:44

9.18km

290m

Hiking

Hike the moderate 5.7-mile Castle Coch and Craig Yr Allt loop, exploring a fairytale castle, Fforest Fawr woodlands, and panoramic views.

Last updated: February 26, 2026

Waypoints

A

Start point

Parking

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1

943 m

Castell Coch

Highlight • Castle

Castell Coch is a 19th-century castle overlooking the village of Tongwynlais. Whilst there has been a castle on the site since the Norman period, architect William Burges transformed the crumbling …

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2

5.18 km

Craig yr Allt

Highlight • Trail

Craig yr Allt is a hill in South Wales with an unmarked summit overlooking Caerphilly to the east and the villages of Nantgarw and Taff's Well to the west. The …

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B

9.18 km

End point

Parking

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Way Types & Surfaces

Way Types

3.82 km

3.20 km

1.20 km

739 m

229 m

Surfaces

3.16 km

2.27 km

1.69 km

1.49 km

326 m

261 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 (240 m)

Lowest point (80 m)

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Weather

Powered by Foreca

Wednesday 6 May

14°C

7°C

36 %

Additional weather tips

Max wind speed: 13.0 km/h

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This route was planned by komoot.

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Frequently Asked Questions

What is the overall difficulty and terrain like on this loop?

This loop is generally considered a moderate hike, requiring a good level of fitness due to its various ascents and descents. The terrain is quite varied, featuring natural paths, forestry tracks, woodland trails, and some paved or gravel sections. You'll encounter grassy trails and heather-strewn hillsides, especially on Craig yr Allt. Be prepared for numerous short, strenuous climbs and descents, and some paths may be muddy or overgrown after rain. There are also stiles to cross, some with dog gates, and short stretches of road walking.

What are the main points of interest and views along the route?

The trail offers a wonderful blend of historical and natural beauty. It starts and ends at the enchanting Castell Coch, a 'fairytale 19th-century castle'. You'll walk through extensive woodlands like Fforest Fawr, and local nature reserves. Upon reaching the summit of Craig yr Allt, you'll be rewarded with expansive views stretching south to Cardiff and the Bristol Channel, west towards Garth Mountain, and overlooking undulating hills and scattered settlements, including Caerphilly to the north and east.

Is the Castle Coch and Craig Yr Allt loop dog-friendly?

Yes, the trail is generally dog-friendly. You'll find stiles along the route, some of which are equipped with dog gates, making it easier for your canine companion. However, please keep dogs under control, especially in areas with livestock or wildlife, and be mindful of other hikers.

Where can I park to access the trailhead, and is there public transport available?

The loop typically starts and ends near Castell Coch. Parking is usually available in the vicinity of the castle. For public transport, you would need to check local bus routes that serve Tongwynlais or the area around Castell Coch, as it's a popular attraction.

What is the best time of year to hike this trail?

The trail can be enjoyed year-round, but spring and autumn are particularly beautiful. In spring, you might spot bluebells and wild garlic in the woodlands. Autumn offers stunning foliage colours. Summer is also pleasant, though some sections might be overgrown. Winter hiking is possible, but be prepared for potentially muddy and slippery conditions, especially on steeper sections.

Are there any permits or entrance fees required for this hike or for Fforest Fawr?

No, there are no specific permits or entrance fees required to hike the Castle Coch and Craig Yr Allt loop itself, nor for accessing the general Fforest Fawr woodland area. However, if you wish to enter and explore the interior of Castell Coch, there will be an admission fee.

Does this trail intersect with any other well-known paths?

Yes, this route incorporates sections of several other well-known paths. You'll find yourself on parts of the Taff Trail, the Cambrian Way, and Lôn Las Cymru (South). It also forms part of the longer Taff Ely Ridgeway Walk, offering opportunities to extend your hike if desired.

What should I bring for a hike on this loop?

Given the moderate difficulty and varied terrain, we recommend sturdy hiking boots, appropriate clothing for the weather (layers are always a good idea), and plenty of water. Walking poles can be advisable, especially for the steeper and potentially slippery sections. Don't forget a map or GPS device, as well as snacks.

Is this a good trail for families with children?

Despite its moderate rating and climbs, the Craig yr Allt section is often recommended for families thanks to its accessible paths and rewarding scenery. However, be aware of the elevation changes and varied terrain. It's best suited for families with children who are accustomed to hiking and have a good level of fitness.

Are there any facilities like cafes or pubs near the trail?

Yes, as the trail starts and ends near Castell Coch and passes through populated areas, you can find amenities such as cafes and pubs in the nearby villages, particularly in Tongwynlais. These can be great spots for refreshments before or after your hike.

What kind of wildlife or plants might I encounter?

The trail winds through significant woodlands and nature reserves like Fforest Fawr, Fforestganol, and Cwm Nofydd. Depending on the season, you might spot bluebells and wild garlic. The diverse habitats support various bird species and small mammals. Keep an eye out for local flora and fauna as you explore the tranquil environments.

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