The Cooley & Mourne Mountains
Two granite mountain ranges separated by Carlingford Lough and connected by a ferry crossing — where the Cooley Mountains of County Louth meet the Mournes of County Down in a single, cross-border walking adventure.
About The Cooley & Mourne Mountains
Your guide to walking in this stunning region
The Cooley and Mourne Mountains offer one of Ireland's most distinctive hiking journeys. Two ranges. Two jurisdictions. One unforgettable crossing.
You begin in Dundalk, cross the Cooley Mountains into medieval Carlingford, and continue north into County Down. The route climbs through Rostrevor and into the high Mournes, finishing in Newcastle on the shores of the Irish Sea.
The Mourne Wall, a 35km drystone structure linking fifteen summits, guides you across the high ground. C.S. Lewis spent childhood summers in these mountains. He built Narnia from what he found here.
The Cooley Peninsula juts into the Irish Sea between Dundalk Bay and Carlingford Lough, crowned by Slieve Foy at 589 metres. These hills carry the weight of Irish mythology. The Táin, the great cattle raid of Irish legend, unfolded here. Cú Chulainn defended the ford against an entire army on these slopes.
Carlingford is one of Ireland's best-preserved medieval towns. King John's Castle commands the lough. The narrow streets and small harbour, where oysters have been farmed since the 1970s, replaced a herring fishery that sustained generations of coastal families on both shores.
Crossing into County Down, the landscape shifts. Rostrevor, a Victorian village sheltered beneath the first Mourne slopes, eases you into what comes next.
The Mournes are higher, rockier and more austere. The Mourne Wall, built between 1904 and 1922 by the Belfast Water Commissioners, links fifteen summits across the high plateau. Slieve Donard at 852 metres is the highest peak in Northern Ireland. On clear days the view reaches Snowdonia and the Isle of Man.
The journey ends in Newcastle, where the mountains of Mourne sweep down to the sea.
info Walking Area Quick Facts
Difficulty
Duration
5–8 days
Season
From May to September
Accommodation
B&B & Guesthouses
Walking Tours
6 tours available
Included in Every Tour
- ✓Accommodation: Welcoming en-suite B&B rooms
- ✓Breakfast: Full Irish breakfast every morning
- ✓Luggage Transfer: Daily transfer of your main bag between accommodations
- ✓Personalised itinerary and route app for your smartphone
- ✓Support: 24/7 emergency support throughout your holiday
- ✓Pre-Departure Pack: Information pack sent before you travel
Not Included
- ✗Flights: Travel to Ireland is not included
- ✗Insurance: You'll need travel and walking holiday insurance
- ✗Meals: Lunches and dinners are not included
Walking Tours in The Cooley & Mourne Mountains
Self-guided walking holidays with accommodation and luggage transfers included
The Landscape
The Cooley peaks are rounded and forested, shaped by glaciation. The Mournes are rockier and sharper, with granite summits that feel genuinely remote. Carlingford Lough lies between them, a sheltered sea inlet framed by mountains on both shores.
Lower slopes carry oak, birch and ash woodland. Higher ground opens to bare granite, alpine grasses and purple heather blooming in late summer. The Mourne Wall runs across the high plateau like a spine.
Red grouse work the heather. Peregrine falcons hunt the cliff faces. Sika deer cross the open moorland at dawn and dusk.
Culture & Heritage
The Cooley and Mournes sit at the intersection of ancient mythology, mediaeval history, literary inspiration and cross-border identity. Few walking routes in Ireland carry this much layered meaning.
The Táin Bó Cúailnge, the great epic cycle of Irish mythology, unfolds across the Cooley hills. Cú Chulainn defended the ford against an entire army on these slopes. Walking here with that story in your pocket changes how the landscape feels beneath your feet.
Carlingford is the historical anchor. A mediaeval Norman stronghold with King John's Castle, intact gate towers and narrow streets that have changed little in centuries. The town's oysters are celebrated for their clean, mineral taste, farmed in the lough since the 1970s after the old herring fishery that sustained generations of coastal families finally faded.
C.S. Lewis spent childhood summers in the Mournes. The view from Rostrevor across the lough was, by his own account, the direct inspiration for Narnia. Percy French immortalised these mountains in his 1896 song, which is one of the most recognised Irish songs ever written.
For food, look out for Carlingford oysters, fresh seafood from the fishing port of Kilkeel, and the seafront restaurants of Newcastle at the journey's end. A fine walk deserves a fine finish.
Points of Interest
Key highlights you'll discover in The Cooley & Mourne Mountains
Carlingford
A mediaeval Norman port town on the southern shore of Carlingford Lough, with King John's Castle, intact gate towers and narrow streets that have changed little in centuries. One of the most intact mediaeval towns in Ireland and the natural starting point for the journey.
Slieve Donard
t 852 metres, the highest peak in Northern Ireland and the high point of the entire route. The summit cairn sits on the remains of a Neolithic passage tomb, and on clear days the view stretches to Scotland, the Isle of Man and the Welsh mountains.
The Mourne Wall
A 35km drystone structure built between 1904 and 1922, linking fifteen summits across the high Mournes. Walking sections of it is one of the great ridge experiences in Ireland, a piece of extraordinary mountain engineering that took nearly two decades to complete.
Rostrevor
A Victorian seaside village sheltered beneath the first Mourne slopes, with views back across the lough to the Cooley Mountains. C.S. Lewis described the view from here as the most beautiful in the world. It is easy to see why.
Things to Do in The Cooley & Mourne Mountains
Top activities and experiences in the area
Walking the Cooley and Mourne Mountains
A multi-day hiking and walking journey from Dundalk through mediaeval Carlingford, across the Cooley Peninsula and into the high Mournes, finishing in Newcastle on the shores of the Irish Sea. Two ranges, two jurisdictions, one unforgettable crossing.
Summiting Slieve Donard
The highest peak in Northern Ireland at 852 metres, with a ridge approach that rewards experienced mountain walkers with views stretching to four countries on a clear day. The path follows the Mourne Wall for much of the ascent.
Exploring Mediaeval Carlingford
King John's Castle, the Dominican friary, Taaffe's Castle and the old gate towers sit within a few minutes' walk of each other. An evening in Carlingford, with fresh oysters and a slow walk along the waterfront, sets the tone for the entire journey.
The Táin Trail and Cooley Mythology
The Cooley hills are the setting for the Táin Bó Cúailnge, the great Irish epic in which Cú Chulainn defended the ford against an entire army. Walking these hills with that story in your pocket adds a layer that no other Irish trail quite matches.
Best Time to Visit
May and June are our top picks. Long evenings, wildflowers on the Cooley foothills and manageable trail traffic make these months hard to beat. June and early July offer the longest daylight hours, which matter for the longer Mourne Ridge days.
September is arguably the finest month of all. Bracken turns gold, the light is sharp and clear, trails are quieter, and accommodation is easier to book.
July and August are the warmest months but the busiest. Slieve Donard sees significant foot traffic, and accommodation needs to be booked well in advance.
The walking season runs from late spring through to late autumn, typically April to October.
Time your visit with a festival. Many trails host walking festivals throughout the season — see our complete 2026 walking festivals calendar to plan around one.
Who Is It For?
This tour suits walkers who have completed at least one long-distance trail and want a genuine mountain challenge. The cross-border element adds a layer that few Irish walking routes can match, moving from the mythology of the Cooley Peninsula through mediaeval Carlingford and into the granite uplands of County Down.
The C.S. Lewis connection draws readers and those with an interest in literary history. The variety across the route—mythology, mediaeval heritage, Mourne Wall engineering, and forest walking—means different walkers will find different things to love within the same itinerary.
This route is not the right choice for first-time long-distance walkers, those with serious knee problems, or anyone new to exposed mountain terrain. The Mournes demand experience, good judgement and the right gear.
Where You'll Stay
We book quality guesthouses and B&Bs at each stop along the route.
Carlingford offers charming guesthouses and small hotels overlooking the lough, a fine base for your first night in one of Ireland's most intact mediaeval towns.
Rostrevor is a quieter stop, a Victorian seaside village sheltered beneath the first Mourne slopes, with welcoming B&Bs and views back across to the Cooley Mountains.
Newcastle is the largest base on the route. It is a Victorian seaside resort with a full range of accommodations, a promenade, and direct beach access.
All properties are selected for hikers. Breakfast is included at every stop. Your bags are transferred ahead each day, so you only carry a light daypack on the trail.
Getting Here
Dublin Airport (DUB) is the primary arrival point, with direct services from across Europe, North America and the Middle East, approximately 100km south of Dundalk
Belfast International Airport (BFS) and George Best Belfast City Airport (BHD) both serve the Mourne side, within 60km of Newcastle
Irish Rail operates services from Dublin to Dundalk and Drogheda on the southern section of the route
Translink NI Railways operates Belfast services connecting to Newcastle in approximately 45 minutes
Plan your full journey at Transport for Ireland
We Handle the details. Full transfer and logistics details are included in your pre-departure pack. You arrive knowing exactly where to go and how to get there.
Travel Tips
lightbulb The Mournes demand full mountain gear expand_more
The high Mournes are genuine mountain terrain. Conditions change quickly and summits above 700 metres feel exposed even in summer. Waterproofs, warm layers and sturdy boots are non-negotiable on the upper sections.
backpack Allow a full evening in Carlingford expand_more
The town deserves more than a quick look on arrival. An evening here with a meal, a walk along the lough shore and a pint in one of the old stone pubs sets the tone for everything that follows.
checkroom Book Newcastle accommodation early for summer expand_more
Newcastle is a popular seaside town and fills quickly in July and August. Book your final night well in advance, particularly for weekends, to avoid a stressful finish to a memorable journey.
Local Food & Drink
Taste the flavours of The Cooley & Mourne Mountains
Carlingford oysters
Farmed in the lough since the 1970s, Carlingford oysters have a distinctive mineral sweetness from the mix of mountain freshwater and tidal salt — served at the annual Oyster Festival each August
Cooley Peninsula craft beer
Carlingford Brewing Company produces small-batch ales using local spring water — available in the pubs and restaurants of Carlingford village
Mourne lamb and mountain produce
Sheep reared on the open Mourne hillsides produce meat with a flavour shaped by heather and wild grasses — find it on menus in Newcastle and Rostrevor
Newcastle seafood
Fresh fish and shellfish landed at the harbour — Mourne Seafood Bar is a standout, serving locally caught crab, mussels and lobster with views of the mountains
What Our Walkers Say
Based on 58 verified reviews
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