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South Wales
Cardiff

Llanishen Reservoir

The best dog-friendly hikes and walks around Llanishen Reservoir

4.5

(641)

10,488

hikers

35

hikes

Dog friendly hiking trails around Llanishen Reservoir offer diverse landscapes across 110 acres of green and blue space in North Cardiff. The area features approximately 5 km of circular paths around the reservoirs, providing waterside views and varied habitats including grassland, woodland, and scrub. While generally considered easy, some sections can be steep or muddy, especially after rain. The reservoir is also designated as a Site of Special Scientific Interest due to its ecological value.

Best dog friendly hiking trails around Llanishen Reservoir

  • The most popular dog friendly hiking route is Cefn Onn Quarry – Coed Cefn-onn Woodland Path loop from Lisvane and Thornhill, a 6.7 miles (10.8 km) trail that takes 3 hours 7 minutes to complete. This moderate route explores woodland paths and offers varied scenery.
  • Another top favourite among local hikers is Graig Hill – Coed Cefn-onn Woodland Path loop from Lisvane, a moderate 6.6 miles (10.6 km) path. This route features a mix of open areas and woodland, providing diverse terrain for hikers and their dogs.
  • Local hikers also love the Coed Cefn-onn Woodland Path – Cefn Onn Quarry loop from Rudry, a 5.7 miles (9.1 km) trail leading through woodland and quarry areas, often completed in about 2 hours 42 minutes.
  • Hiking around Llanishen Reservoir is defined by circular waterside paths, varied woodlands, and open grasslands. The network offers options for different ability levels, from easy strolls to more moderate excursions.
  • The routes in Llanishen Reservoir are highly rated by the komoot community with an average score of 4.6 stars from over 590 reviews. More than 10,000 hikers have used komoot to explore Llanishen Reservoir's varied terrain.

Last updated: May 17, 2026

4.9

(21)

92

hikers

#1.

Coed Cefn-onn Woodland Path – Forest Descent Path loop from Lisvane and Thornhill

10.4km

03:01

280m

280m

Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

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Moderate

Hard hike. Very good fitness required. Easily-accessible paths. Suitable for all skill levels.

Hard
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Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

Moderate

Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

Moderate

Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

Moderate
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Tips from the Community

Luke Jones
March 9, 2026, Craig Llysfaen Gate

Can't miss. Right next to the road.

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This is a stunning walk along the ridge with clear views right across Cardiff and the Severn estuary. Highly recommend.

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Lovely woodland walk, can be a bit boggy in places. The dog absolutely loved it. Little streams for the dog to splash in.

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An iron bridge constructed in 1829 as a part of Lord Tredegar's estate.

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Craig Llysfaen is a hill in South Wales that stands tall at 265 m above sea level. The view from the top is spectacular and looks over Cardiff, Newport, and on a day with good visibility, north all the way to Pen-y-fan and the Brecon Beacons and east toward Flat Holm island and the Severn crossing.

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Cefn Onn Quarry is a former slate quarry in Cardiff. It is situated next to Coed Tranch-yr-Hebog and Wern Ddu forests. Enjoy some lovely views from here over the surrounding Vale of Glamorgan and nearby towns.

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Craig Llysfaen, also known as Lisvane Graig, is a prominent hill of 265 m above sea level, overlooking Cardiff, some 7 miles north of the city centre.

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Built in 1626 by Sir Thomas Morgan, Steward to the Earl of Pembroke, it was one of the first of the 'mock' castles to be built in Wales.  In 2022 Cadw designated the castle gardens and park Grade II on the Cadw/ICOMOS Register of Parks and Gardens of Special Historic Interest in Wales.

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Frequently Asked Questions

How many dog-friendly hiking trails are available around Llanishen Reservoir?

There are over 35 dog-friendly hiking trails around Llanishen Reservoir, ranging from easy strolls to more challenging routes. This variety ensures there's something suitable for every dog and owner.

Are there any easy, circular dog walks around Llanishen Reservoir?

Yes, the reservoir itself offers approximately 5km of circular paths that are generally easy and suitable for dogs. While specific easy routes aren't listed here, many of the paths around the reservoir are flat and well-maintained, perfect for a leisurely walk with your dog. Some sections are even accessible for wheelchairs and pushchairs, though certain areas can be steep or muddy after rain.

What are the rules for dogs when hiking around Llanishen Reservoir?

Llanishen Reservoir is very dog-friendly, but it's important to keep your dog under control, especially given the area's significant ecological value as a Site of Special Scientific Interest (SSSI). Always keep dogs on a lead around wildlife, particularly near bird nesting areas and where other animals like grass snakes or otters might be present. Be mindful of other visitors and ensure you clean up after your dog.

Are there any longer, more challenging dog-friendly hikes in the area?

For those seeking a longer challenge, consider the difficult 21.7 km route, Cefn Onn Quarry – Coed Cefn-onn Woodland Path loop from Rhiwbina. This trail features significant elevation gain and offers a more extensive exploration of the surrounding landscape.

What kind of landscapes can I expect on dog-friendly trails near Llanishen Reservoir?

The trails around Llanishen Reservoir offer a diverse mix of landscapes. You'll find peaceful waterside views, open grasslands, woodlands, and scrub habitats. The area is known for its ecological richness, including diverse fungi and various bird species, providing varied scenery for you and your dog to enjoy.

Are there any dog-friendly cafes or pubs near Llanishen Reservoir?

Yes, a modern two-story visitor centre with a cafe is located at Llanishen Reservoir, offering spectacular views. While specific dog policies for the indoor cafe aren't detailed, many visitor centres and cafes in outdoor areas are becoming more dog-friendly, often with outdoor seating options. It's always a good idea to check directly with the venue before your visit.

What do other hikers enjoy most about hiking with their dogs in Llanishen Reservoir?

The area is highly rated by the komoot community, with an average score of 4.56 stars from over 590 ratings. Reviewers often praise the peaceful waterside paths, the varied natural scenery, and the overall accessibility for walks with their dogs.

Are there any moderate-difficulty dog walks available?

Yes, there are several moderate-difficulty routes. For example, the Cefn Onn Quarry – Coed Cefn-onn Woodland Path loop from Lisvane and Thornhill is a 10.7 km moderate hike, offering a good balance of distance and elevation for you and your dog.

Can I find trails with good viewpoints for me and my dog?

Many trails in the broader area offer excellent viewpoints. For a route that includes notable views, consider the Craig Llysfaen Summit View – Coed Cefn-onn Woodland Path loop from Rudry, a 7.6 km moderate hike that will lead you to scenic spots.

What is the best time of year to visit Llanishen Reservoir with my dog?

Llanishen Reservoir is enjoyable year-round. Spring and autumn offer pleasant temperatures and beautiful foliage. Summer is great for longer days, but remember to bring plenty of water for your dog. Winter walks can be peaceful, but be prepared for potentially muddy conditions, especially after rain, and ensure your dog is comfortable with colder weather.

Are there any dog-friendly routes that incorporate woodland paths?

Absolutely. Many of the routes in the area feature beautiful woodland sections. The Graig Hill – Coed Cefn-onn Woodland Path loop from Lisvane, a 10.5 km moderate hike, is a great option that takes you through lovely wooded areas, perfect for dogs who enjoy sniffing around trees.

Is there parking available for dog walkers at Llanishen Reservoir?

Yes, parking facilities are available at Llanishen Reservoir, making it convenient for dog walkers to access the trails. The visitor centre area provides dedicated parking, though it's always advisable to check for any potential fees or capacity during peak times.

Most popular routes around Llanishen Reservoir

Hiking around Llanishen Reservoir

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