Overview
The Grennan Loop Walk is a 6.6 km circuit that begins and ends in the centre of Thomastown, County Kilkenny. Managed by the Thomastown Community Network, this moderate trail climbs a gentle 60 metres and typically takes two hours to complete. Bright red arrows on a white background guide the way through a landscape where Norman fortifications, quiet woodlands and the River Nore intersect. The route is free to access, but please note that dogs are not permitted on the trail to protect local wildlife and preserve the historic sites.
History & Background
The Grennan landscape carries centuries of layered history. Grennan Castle sits on a low mound overlooking the river and originally began as a motte-and-bailey fortification around 1210. It was commissioned by Thomas FitzAnthony, an Anglo-Norman magnate who helped establish English control in the region. Within a decade, the wooden structure was replaced by a formidable stone keep measuring approximately 18 by 13 metres, with walls up to three metres thick. The east-side entrance was elevated for defence, and the surrounding estate grew into a self-sufficient hub complete with orchards, a water-corn mill, a forge, a bakery and even a wine cellar that shipped goods down the river.
The castle weathered turbulent periods, including seizure by Cromwell’s forces in 1650 and later passage to the Denn family. Local tradition claims King Richard II attended a banquet here in the 1390s, though historical records on the event remain scarce. By the early 1800s, the keep had fallen into disrepair, briefly serving as a cattle shed before sections of the outer wall were lost. Today, the ruins stand as a quiet testament to medieval engineering and the shifting tides of Irish history.
What to See & Do
Historic and architectural stops
- Grennan Castle – The stone keep dominates the valley, with remnants of the original earthworks still visible. Panoramic views stretch across the river and surrounding farmland.
- Sweetman Castle – A 14th-century tower now reclaimed by ivy and wildflowers, offering a glimpse of later medieval architecture.
- Thomple church ruins – An ecclesiastical site where the intact east window remains one of the most striking surviving features.
- Dysert O’Dea Castle – A fortified residence perched nearby, providing sweeping vistas of the Nore valley.
- Historic mill buildings – Former grain-processing structures line the riverbank, hinting at the area’s industrial past.
- Ollie Walsh statue – A bronze tribute to the local hurling legend, adding a contemporary cultural marker to the historic route.
Nature and interactive features
The trail follows the pebbly banks of the River Nore, where ducks, swans and sand martins can often be spotted. The surrounding deciduous woodlands host oak, birch, beech, spindle holly, wild garlic, wood anemone and bluebells. Buzzards frequently soar overhead, making it a rewarding route for casual birdwatchers.
Along the Grennan Woods section, Trail Kilkenny has installed audio points. Scanning the QR codes unlocks short narrations about the local trees, wildlife and folklore, adding an educational layer to the walk. Benches and a wooden swing at a designated viewpoint provide a natural resting spot to take in the scenery.
Practical Information
- Start point: Market Street, Thomastown town centre.
- Trail markings: Red arrows on a white background.
- Distance & time: 6.6 km loop; approximately 2 hours at a moderate pace.
- Elevation: 60 m total ascent.
- Parking: Limited on-street parking is available in Thomastown. Follow local signage and respect resident permit zones.
- Facilities: Public toilets are located in Thomastown town centre and at the nearby Inistioge visitor centre. Benches and a swing are placed along the route.
- Safety: The path is well-marked but includes modest climbs and river-edge sections. Sturdy walking shoes are recommended. The trail is not wheelchair-accessible due to uneven ground and stile crossings.
- Dog policy: Dogs are not permitted on the route.
Getting There
By car – From Kilkenny city, take the N77 south for approximately 15 km to Thomastown. Turn left onto Market Street; street parking is available near the town hall. By bus – Bus Éireann route 73 connects Kilkenny and Thomastown with several daily services. The bus stop is a short walk from Market Street. By train – Thomastown railway station sits on the Dublin–Waterford line. The trailhead is a five-minute walk from the station exit.
Nearby Attractions
- Inistioge – A riverside village known for craft shops, the historic Inistioge Bridge and the Irish Wool Centre.
- Goresbridge – Another scenic Nore-river settlement featuring a historic bridge, local cafés and additional walking paths.
- Thomastown–Inistioge route – For those seeking a longer day out, the Grennan Loop connects to this extended riverside walking trail.
Seasonal Highlights
- Spring – Woodland floors carpet with bluebells, and the air carries the distinct fragrance of wild garlic.
- Summer – Extended daylight makes the riverbank sections ideal for a relaxed pace and a packed lunch.
- Autumn – The Nore valley transforms with reds and golds, offering excellent conditions for landscape photography.
- Winter – The trail remains open year-round, but recent rain can leave sections slick and muddy. Waterproof footwear is essential.
Accessibility & Family Tips
The route works well for families with children aged seven and over who can navigate short stiles and uneven woodland paths. A stroller is not recommended due to the terrain. Bring a water bottle and a light snack, as there are no refreshment stops on the trail itself. After heavy rainfall, check the River Nore levels before setting out, as low-lying sections near the water can become waterlogged. The trailhead is clearly signposted from Market Street, and following the red arrows ensures a straightforward, self-guided experience.