Slemish Mountain

Overview

Slemish Mountain dominates the flat landscape of County Antrim, its conical shape the eroded core of an extinct volcano. At 437 m (1,434 ft) it is the highest point for miles around, visible from the surrounding farmland and the Antrim coast. The mountain is most famous as the place where a teenage Saint Patrick spent six years as a slave‑shepherd before escaping to Gaul.

The well‑marked 1.2‑mile (≈1.9 km) loop walk starts at the base car park and takes about an hour to reach the summit, rewarding hikers with sweeping views of the Antrim countryside, the distant Scottish coast and, on clear days, the Sperrin Mountains.

Geology & Landscape

Slemish is the exposed plug of a basaltic volcano that was active more than 50 million years ago. Over millennia the softer surrounding rock eroded away, leaving the steep, almost sheer hill that can be seen from up to thirty miles on a clear day. The hard dolerite core gives the summit its rugged character and creates the dramatic contrast between the smooth surrounding plains and the rocky upper slopes.

History & Legend

The mountain’s Irish name, Sliabh Mis, means “Mis’s mountain”, a reference that predates the Christian era. Geologically it is a basalt plug left standing after softer surrounding rock eroded away over more than 50 million years.

According to early Irish tradition, the 16‑year‑old Patricius was captured by pirate raiders in 406 AD, taken to the north‑east of the island and forced to tend sheep on Slemish for a local chieftain named Milchu (also recorded as Miliucc). Some sources give the slave name Succoth. During those six solitary years Patrick turned to constant prayer, a spiritual awakening that later underpinned his missionary work. A nearby early‑Christian site, Skerry Churchyard, is thought to be one of the first churches he founded.

The mountain became known as the “Holy Hill of St Patrick” and a pilgrimage destination. Every 17 March, crowds climb the steep path to honour Ireland’s patron saint, and a small festival is held in nearby Broughshane.

Flora & Fauna

The open heath and grassland support a range of upland birds. Walkers often spot wheatears, meadow pipits, buzzards and ravens circling the summit. Irish hares are a regular sight in the surrounding plains. The sparse vegetation and exposed rock also provide a good opportunity for wild‑flower spotting in late spring.

Walking the Loop

The route is often referred to as the Slemish Mountain Loop Walk. While the lower sections follow a grassy track, the upper slopes are rocky and occasionally require light scrambling. There is no formal way‑marked trail; walkers choose their own line up the mountain, with the south‑western approach favoured for its gentler gradient.

• Navigation – The free ActiveME app provides a GPX/KML file and live map for the 2 km loop. A printed map is also available at the car park.
• Dog‑friendly – Dogs are welcome but must be kept on a lead.
• Facilities – A large free car park, toilets, a picnic area and interpretation boards are situated at the trailhead.
• Safety – The path can become very slippery in wet weather; sturdy, grippy walking shoes and waterproofs are essential. The descent can be trickier than the ascent when the ground is wet.

St Patrick’s Day Pilgrimage – Park & Ride

The annual pilgrimage on 17 March draws over a thousand participants. Since 2025 the event has operated a Park & Ride service from the Silverwood/Michelin site on Raceview Road, Broughshane (off the M2). Buses run from 9 am until the last departure at 3.30 pm. On‑site parking at the summit is closed for the day; only blue‑badge holders and service/assistance dogs may use the designated area. The event includes a petting farm, face‑painting, traditional Irish music and a marquee for dancing. Climbers who reach the top receive a St Patrick’s Day certificate (subject to availability).

Events & Pilgrimage

• St Patrick’s Day pilgrimage (17 March) – Large crowds join a communal climb, often accompanied by local storytellers and a modest festival in Broughshane.
• Annual pilgrimage walk – Throughout the year, smaller groups and guided walks are organised by local heritage groups.

Practical Information

The walk is open year‑round; there are no formal opening hours, but the car park and facilities are accessible at all times. During the St Patrick’s Day pilgrimage the park‑and‑ride service replaces on‑site parking.

Getting There

From Ballymena, follow the A42 eastwards for about 8 km, then turn onto the B94 towards Broughshane. Signage for Slemish Mountain appears shortly after the turn. The car park is clearly signposted.

Nearby Attractions

After the climb, the Antrim region offers a wealth of sights within a short drive: the Giant’s Causeway, Dunluce Castle, the Fair Head cliffs, and the charming town of Ballymena. The heritage office in Armoy provides further information and the free wildlife booklet. For a historic stop, consider a visit to Antrim Castle, a short 20‑minute drive north.

Safety Notes

The path is not wheelchair‑accessible and can be hazardous when wet. Walkers should stay on the marked route, watch for loose stones and be prepared to turn back if weather deteriorates.

Enjoy the blend of natural beauty, geological intrigue and early Irish history that makes Slemish Mountain a memorable stop on any Antrim itinerary.