Mourne Mountains: Hiking Guide

By NorthernIreland.org

Walks & Outdoors
#mourne mountains#mourne mountains hiking#mournes northern ireland#slieve donard#walking#outdoors

Mourne Mountains: Hiking Guide

The Mournes arrive suddenly. You’re driving south from Belfast — see our guide to the best things to do in Belfast — through rolling farmland and then, somewhere past Ballynahinch, the horizon lifts. A granite skyline appears — sharp, dark, and much bigger than you expected. Northern Ireland is a small place, and it’s easy to assume it doesn’t have room for proper mountains. The Mournes prove otherwise.

This compact range in County Down — designated an Area of Outstanding Natural Beauty — covers roughly 15 by 8 kilometres of high ground between Newcastle and Kilkeel. Twelve peaks exceed 600 metres. The highest, Slieve Donard, reaches 850 metres and is the tallest point in Northern Ireland. On a clear day from the summit, you can see England, Scotland, Wales, the Republic of Ireland, and nearby Strangford Lough simultaneously. That fact alone is worth the walk up.

C.S. Lewis, who grew up in Belfast, could see the Mournes from his childhood home. He later said they were part of the inspiration for the landscapes of Narnia. Tollymore Forest Park at the foot of the mountains also served as a Game of Thrones filming location — those mysterious, ancient-feeling mountains visible on the horizon, always suggesting something beyond. Walk among them and you’ll understand what he meant. There’s a quality to the light and silence up here that feels older than the rock itself.

The Key Peaks

Slieve Donard (850m)

The big one. Northern Ireland’s highest point and the peak most visitors come for. The summit cairn sits on the remains of an ancient stone cell, traditionally associated with St Donard, who is said to have prayed here in the fifth century. The views in every direction are exceptional — the Irish Sea below, the Cooley Mountains across Carlingford Lough, and on those rare perfectly clear days, the mountains of Snowdonia.

Slieve Commedagh (767m)

Donard’s neighbour to the west and the second-highest peak. Less visited, which is part of its appeal. The saddle between Donard and Commedagh is crossed by the Mourne Wall (more on that below), and the views across the Silent Valley from Commedagh’s summit are among the finest in the range.

Slieve Binnian (747m)

Many experienced walkers consider Binnian the best mountain in the Mournes. The summit ridge is topped with dramatic granite tors — weathered rock formations that look like a giant’s abandoned building blocks. The north tor is particularly striking. Below, the Blue Lough sits dark and still in its corrie. Binnian feels wilder and more remote than Donard, despite being only a few kilometres away.

Slieve Bearnagh (739m)

The most visually distinctive peak, crowned with enormous granite tors that are visible from miles around. The scramble through the tors to reach the true summit is the closest thing to rock climbing you’ll find on a Mourne hillwalk. Not technically difficult, but exhilarating.

Slieve Donard from Donard Park

Distance: 9 km return | Ascent: 850m | Time: 4–5 hours

The classic Mourne walk. Start from Donard Park car park on the edge of Newcastle. The path follows the Glen River through beautiful oak and birch woodland — a gentle, sheltered start that gives no hint of what’s above. After about 2 km, the trees thin and you emerge onto open mountainside. The path steepens and follows the saddle wall up to the col between Donard and Commedagh, then turns right along the Mourne Wall to the summit.

The final section is steep and rocky but straightforward. The summit has a large stone cairn and a trig point. On busy weekends in summer, expect company at the top.

Trassey Track to Hare’s Gap

Distance: 8 km return | Ascent: 400m | Time: 3–4 hours

An easier walk that takes you into the heart of the mountains without requiring a summit push. Start from the Trassey Track car park (signposted off the Trassey Road near Bryansford). The broad track leads gradually uphill through farmland and moorland into the dramatic U-shaped valley of Hare’s Gap — a natural pass between Slieve Bearnagh and Slievenaglogh.

Hare’s Gap is a striking spot. The path narrows and steepens in the final approach, with rocky ground and big views opening up. From here, you can turn back or extend the walk — left to Slieve Bearnagh’s summit, right towards the Brandy Pad.

This is an excellent introductory walk for the Mournes. Manageable distance, genuine mountain scenery, and the option to extend if you’re feeling strong.

The Brandy Pad

Distance: Varies — typically 12–14 km as part of a circuit | Ascent: 500–700m | Time: 5–7 hours

An old smugglers’ path that traverses the central Mournes, running roughly between Hare’s Gap and the Bloody Bridge on the coast south of Newcastle. The name comes from its original purpose — smugglers used it to carry brandy and other contraband from ships in the coves below to the interior.

The Brandy Pad is not a summit walk but a mountain traverse, and it’s one of the finest ridge-level walks in Ireland. The path contours across the steep flanks of Slieve Commedagh and the Ben Crom valley with views that constantly change. Combine it with the Trassey Track and the Glen River path to create a superb circular walk.

The Mourne Wall

The Mourne Wall runs for 35 kilometres over fifteen summits, enclosing the catchment area of the Silent Valley Reservoir. Built between 1904 and 1922 by hand using local granite, it’s a remarkable piece of engineering — dry stone construction, roughly 1.5 metres high, crossing the highest and roughest ground in the range without a single break. The workers carried their tools up the mountains each day and worked in all conditions for eighteen years.

Walking the full wall in a single day — the Mourne Wall Challenge — is a popular endurance event for experienced hillwalkers (35 km, 2,800m+ ascent, 10–14 hours). Most walkers tackle sections rather than the whole thing. But it’s there if you want it.

When to Go

May to September offers the longest days, the warmest temperatures, and the best chance of clear skies. June is statistically the driest month, and the long daylight hours (sunrise before 5 a.m., sunset after 10 p.m. in midsummer) give plenty of time for longer walks.

Winter (December to March) brings snow to the higher peaks regularly, and conditions can be genuinely serious — ice, high winds, limited visibility. Magnificent but requires proper experience and equipment. The Mournes are not the Alps, but people have died up here in winter conditions.

Weather caveat: This is Northern Ireland. Rain is possible on any day of the year. Cloud can descend quickly. Check the forecast, but don’t expect it to be entirely accurate.

What to Bring

The Mournes are real mountains that demand real preparation, even on shorter walks.

  • Waterproof jacket and trousers — non-negotiable, any time of year
  • Walking boots with ankle support and good grip — the ground is rocky and often wet
  • Map and compass — the Ordnance Survey of Northern Ireland 1:25,000 Activity Map (The Mournes) is the one to get. Don’t rely solely on your phone; batteries die, screens freeze, and signals drop
  • Warm layers — temperature drops roughly 1°C per 150m of altitude gain. A warm day in Newcastle can be bitterly cold on Donard’s summit
  • Food and water — there’s nothing to buy once you leave the car park
  • Hat and gloves — even in summer, just in case

Parking and Access

Main Car Parks

  • Donard Park, Newcastle — the most popular starting point, right at the edge of town. Free, but fills up early on weekends and bank holidays. Arrive before 9 a.m. in summer.
  • Trassey Track — smaller car park off Trassey Road near Bryansford. The start point for Hare’s Gap and approaches to Bearnagh and the central Mournes.
  • Carrick Little — a small roadside car park on the south side of the mountains, giving access to Slieve Binnian and the Annalong Valley.
  • Silent Valley — a reservoir with a car park and visitor facilities (small parking charge). Good access to the southern Mournes and the Ben Crom area.
  • Bloody Bridge — a layby on the A2 coast road south of Newcastle. Start point for the Brandy Pad and an alternative approach to Donard.

For transport to the area, see our guide on getting to Northern Ireland.

Access Notes

The Mournes are a mix of public land, water authority land, and private farmland. Access for walkers is generally permitted and well-established, but there’s no universal legal right to roam as in Scotland. Stick to established paths where they exist. Close gates behind you. Don’t disturb livestock. The relationship between walkers and landowners here is built on courtesy, and it works — help keep it that way.

Newcastle: The Gateway Town

Newcastle sits at the foot of Slieve Donard where the mountains meet the sea. It’s the natural base for exploring the Mournes and a pleasant small town in its own right. The long sandy beach, the Slieve Donard Resort (a grand Victorian railway hotel), and a decent selection of cafés, pubs, and restaurants make it a comfortable place to recover after a day on the hills.

Pick up supplies, dry out your boots, and eat well — our Northern Ireland food guide has recommendations for post-hike refuelling. For another great walking experience in Northern Ireland, consider the Causeway Coast Way. And if you’re a hiker who likes to explore trails around the world, the coastal walks around Jervis Bay in Australia offer a striking contrast — clifftop paths above turquoise water, beach-to-beach trails through banksia woodland, and wildlife encounters at every turn. Tomorrow there’s another mountain.