Days Out NI
Coastal walk Kilkeel

Kilkeel to Greencastle Coastal Walk

A free shoreline walk from Kilkeel harbour to a real medieval castle on the lough.

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Open accessWalk it any time — best in daylight
FreeNo ticket needed
KilkeelCoastal walk
Get directions
2-4 hoursHow long
4 miles each wayDistance
FreeCost
Buggy okBest for
On leadsDogs

Kilkeel to Greencastle Coastal Walk — A free shoreline walk from Kilkeel harbour to a real medieval castle on the lough.

  • Distance: Roughly 4 miles each way (about 8 miles return) - shorten from either end.
  • How long: Allow 2-4 hours depending on how far you go and how long you linger at the castle.
  • Terrain: Mix of grass, rough coastal path, rock and shingle - slippery when wet.
  • Dogs: Welcome on leads, especially near grazing fields and the castle.
  • With kids: Low cliffs, rocks and open water with no barriers - keep children close at the edges.
  • Parking: Free parking at Kilkeel harbour and at Greencastle (Greencastle Pier Road).
Plan your visit

Harbour to a real castle along the lough

Start at the busy fishing harbour in Kilkeel and follow the coast west toward Greencastle, roughly 4 miles away. The walk hugs low cliffs and shoreline, mostly level, with the open sea on one side and the Cooley Mountains across Carlingford Lough on the other. You will pass shingle beaches, rocky outcrops and grazing fields as the path works its way along. The finish is the prize: Greencastle Royal Castle, built around 1230 by the Anglo-Norman knight Hugh de Lacy, with its tall stone keep guarding the entrance to the lough. The castle exterior and grounds are free to wander at any time, and you get sweeping views over the water toward Carlingford on the far shore.

Free Free parking Sea & mountain views Medieval castle About 4 miles each way Low cliffs, keep kids close
Good to know before you go:

The Mourne coast hosts seasonal guided walks, ranger-led outings and heritage events through the year, and Greencastle itself opens its keep on Saturdays in summer with occasional guided tours during European Heritage Open Days. Check what's on locally before you travel.

Before you set off

What to bring

  • 👟Good shoes or bootsShore paths can be rocky, uneven and a little muddy after rain.
  • 🧥A coat or windproofThe coast is breezy — a fresh sea wind is half the fun of it.
  • 💧Water and a snackThere is rarely a shop right on the path, so pack a little something.
  • 🔭Binoculars or a cameraFor the seabirds, the seals and the big views across the water.
Good to know

Everything before you go

Cost
Free
Parking
Free parking at Kilkeel harbour and at Greencastle (Greencastle Pier Road)
Distance
Roughly 4 miles each way (about 8 miles return) - shorten from either end
How long to allow
Allow 2-4 hours depending on how far you go and how long you linger at the castle
Difficulty
Easy and mostly flat, but open coast with rocky low-cliff sections
Terrain
Mix of grass, rough coastal path, rock and shingle - slippery when wet
Safety with kids
Low cliffs, rocks and open water with no barriers - keep children close at the edges
Dogs
Welcome on leads, especially near grazing fields and the castle
Buggy-friendly
Not fully - a sturdy off-road buggy manages some stretches but not all; check before you go
Toilets / food nearby
Shops, cafes and public toilets in Kilkeel town nearby
Address
Start at Kilkeel harbour, Kilkeel; finish at Greencastle, Greencastle Pier Road, Kilkeel, Co. Down, BT34 4LR
Questions

Before you go

Is it free?
Free
How far is the walk?
Roughly 4 miles each way (about 8 miles return) - shorten from either end
How long should I allow?
Allow 2-4 hours depending on how far you go and how long you linger at the castle
Can I bring the dog?
Welcome on leads, especially near grazing fields and the castle
Is it buggy-friendly?
Not fully - a sturdy off-road buggy manages some stretches but not all; check before you go
Getting there

Kilkeel to Greencastle Coastal Walk is at Start at Kilkeel harbour, Kilkeel; finish at Greencastle, Greencastle Pier Road, Kilkeel, Co. Down, BT34 4LR. Free parking at Kilkeel harbour and at Greencastle (Greencastle Pier Road). Tap below for directions.

Directions on Google Maps See it on our map
Nearby

Make more of the day

More days out around KilkeelSee what else is close by More coastal walks across NIBeaches, cliffs, harbours and headlands
The story

About this stretch of coast

Greencastle was built around 1230 by the Anglo-Norman knight Hugh de Lacy, at royal expense, to guard the southern edge of the Earldom of Ulster and control the narrow mouth of Carlingford Lough. From 1280 to 1326 it was a favourite residence of Richard de Burgh, the 'Red Earl' of Ulster, one of the most powerful men in Ireland.

The castle had a violent life. Edward Bruce took it in 1316, the Irish captured and destroyed it in 1343 and again in 1375, and it was finally battered into ruin by Cromwell's troops in 1652 after more than four centuries as a working fortress. What survives best today is the rectangular keep, with portions of the curtain wall, corner towers and a rock-cut ditch around it.

The walk itself looks out over Carlingford Lough toward the Cooley Mountains in the Republic, with Kilkeel's harbour at one end - one of Northern Ireland's busiest fishing ports - and the medieval ruin at the other. Seabirds, fishing boats and the Carlingford ferry are all part of the scene.