Overview
Lugduff (Irish: An Log Dubh, translating to “the black hollow”) rises to 653.2 metres in the southern sector of the Wicklow Mountains. It ranks as the 154th-highest summit on the Arderin list and sits firmly within the protected landscape of the national park. The peak forms part of a broad horseshoe ridge that wraps around the Upper Lake of the Glendalough valley. Its most striking feature is the western face, where a distinctive corrugated ridge line drops sharply into the deep glacial trough of Glenmalure. On the eastern side, the slopes ease down toward the hanging valley of Fraughan Rock Glen, creating a terrain shaped by ancient granite intrusions and millennia of glacial carving.
The mountain’s name reflects the dark, hollow-like character of its upper reaches, a feature that has long drawn hill-walkers and peak-baggers to the area. Lugduff sits on the boundary of several classic Wicklow ranges, including Mullacor, Conavalla, and Camaderry, creating a dramatic backdrop for the valley floor below.
Walking the Spinc Trail
The most accessible route to Lugduff is via the Spinc White Trail, a well-maintained 8-kilometre circuit that skirts the Upper Lake. The path is built on elevated wooden boardwalks, designed to protect the fragile bog ecology while keeping walkers dry. The trail climbs steadily, passing the rushing cascade of Poulanass Waterfall before a steep section of roughly 600 wooden steps brings you to a raised viewing platform.
From the platform, the boardwalk continues for about 1.7 kilometres before branching toward the summit of Lugduff. The walk is popular throughout the year, offering a relatively gentle approach to a peak that can otherwise be tackled via more rugged off-trail routes. Early mornings are recommended to avoid the midday crowds and to catch the valley shrouded in mist. The boardwalk is open year-round, but winter weather can make the higher sections icy, so timing your visit for late morning when the sun has warmed the timber is a sensible strategy.
Summit & Views
Reaching the top of Lugduff rewards you with a sweeping panorama of the heart of the Wicklow Mountains. To the west, you look down the dramatic plunge into Glenmalure, where the glacial valley stretches out toward the coast. On clear days, the distant, rounded bulk of Lugnaquilla dominates the skyline, while the rugged shoulders of Scarr and the smooth dome of Tonelagee frame the eastern horizon. The summit itself is marked by a modest cairn and a trig point, quiet enough to hear the wind moving across the heather and granite.
The western wall provides a particularly dramatic perspective of the deep glacial trough that carves the landscape. It is a favourite vantage point for photographers capturing the contrast between the dark, corrugated rock face and the lush greenery of the valley floor.
Practical Information & Getting There
Access to Lugduff is free, and the trailhead begins at the main Glendalough car park. There is ample free parking, though it fills quickly on weekends and during school holidays.
Getting There by Public Transport: Bus Éireann route 133 runs regularly from Dublin City Centre (Busáres) to Glendalough, dropping passengers right at the visitor centre and car park. The journey takes roughly 90 minutes. Getting There by Car: Take the N11 south from Dublin, exit at Roundwood, and follow the R756 through the Avonmore Valley. Turn onto the R755 (Glendalough Road) and follow signs to the national park entrance.
The nearest major towns are Wicklow (about 20 km north) and Bray to the south, both offering train and bus connections.
Safety & Seasonal Tips
While the boardwalk makes the approach manageable, Lugduff is classified as a moderate-to-hard hill-walk due to the elevation gain and exposed summit ridge. The western slopes can become boggy and slippery after heavy rain, so waterproof hiking boots are essential. Mobile phone reception is unreliable across the upper reaches of the park, so carry a physical map or download a GPS track before setting out.
Winter visitors should be aware that the higher sections can freeze overnight, and the boardwalk steps may become icy. The National Park Service occasionally runs free Dawn-Chorus Guided Walks in spring and early summer, departing from the Glendalough car park. These guided sessions explore the lower slopes and highlight the area’s birdlife, offering a practical way to experience the landscape with an expert. For trail updates and weather advice, stop by the Glendalough Visitor Centre before heading out. Check the official park website or consult the MountainViews database for detailed route logs and current conditions before planning your ascent.