Overview
The MacDonnells have held Glenarm since the late 14th century, and the castle their descendants still live in was built here in 1636. That continuity is the point of the place: this is a working family estate that happens to open its gates, not a ruin or a museum. The reason to make the turn off the Causeway Coastal Route is the four-acre walled garden, which took Historic Houses Garden of the Year in 2023. Everything else – the harbour, the heritage centre, the coffee stop – is a pleasant add-on to that.
Glenarm village itself is small, a few hundred people at the southern end of the Glens of Antrim, wrapped around a marina on the North Channel. Half a day covers the garden, a wander through the village and lunch, comfortably.
The walled garden
This is what you come for. Four acres inside old estate walls, restored over years by Lord and Lady Antrim: a yew circle, heritage fruit trees trained along the brick, a working glasshouse and long beds that carry colour from the spring tulips through to late summer. The adjoining woodland walk is quieter and worth the extra twenty minutes for the chance of red squirrels and, in April, a carpet of wild garlic. The garden and walk are open through the day; your ticket also covers the Heritage Centre and the Coach House Museum, so there’s no need to pay twice.
The Antrim McDonnell Heritage Centre traces the clan from their 14th-century Scottish migrations to their long run as the region’s landlords – useful context before or after the garden, and a dry option if the weather turns.
The castle
Don’t arrive expecting to walk the state rooms on any given afternoon. The family live in the castle, and the interior is generally closed to visitors except during set events such as the Tulip Festival in May and the Dalriada Festival in summer, when guided tours run through the Drawing Room, Great Hall and Blue Room. If seeing inside matters to you, time your visit to one of those and book ahead – tour numbers are small. The rest of the year you’re admiring the house and its restored Barbican Gate from the garden side, which is no hardship.
The estate’s history is not all garden parties. During the Great Famine the Earl ran soup kitchens for his tenants, and a cholera outbreak in 1854 left a mass grave near St Patrick’s Church – a plainer record of the period than the castle façade suggests.
Eating and the harbour
The Tea Room, in the estate’s distinctive Mushroom House, does breakfasts, an Ulster fry and a burger made from the estate’s own Glenarm Shorthorn beef; dogs are fine in the outdoor seating. There’s also the Milk Parlour for ice cream and the Potting Shed café for something lighter. Down at the marina, the pontoons are a launch point for sea angling and short coastal cruises, and the waterfront is an easy stroll from the estate gate.
Events through the year
- May: The Tulip Festival is the garden at its best, with the beds at peak and the castle interior open.
- July: The Highland Games take over the green – caber tossing, pipe bands and food stalls.
- Summer: The Dalriada Festival and Summer Madness rotate through the village.
- November–December: Illuminated walks and a Christmas market mark the festive season.
Practical information
- Getting there: Glenarm sits on the Causeway Coastal Route (A2), about 30 km north of Belfast. The Ulsterbus 212 links it with Belfast and Ballymena; the nearest rail station is Ballymena, roughly 15 km inland.
- Opening hours: The estate opens daily 9.00am–5.00pm through the open season, mid-March to 31 October, with last entry at 4.15pm. Winter opening is limited to special events – check glenarmcastle.com before travelling out of season.
- Admission: A Walled Garden and Woodland Walk ticket, which includes the Heritage Centre and Coach House Museum, is £10 for adults, £5 for youths aged 4–17 and free for under-3s, with a £8.50 concession and a £17.50 family rate. Historic Houses members go free.
- Accessibility: The car parks and some garden paths are gravel, which wheelchair users may find heavy going; blue-badge parking is provided and the visitor centre has accessible toilets. Castle interiors, when open, have limited access owing to the original staircases.
- Parking: Free parking is available at the Glenarm Visitor Centre (the old Seaview School), with space for coaches as well as cars.
Nearby
Glenarm is a natural base for the north coast. Within a short drive or up the A2:
- Antrim Coast and Glens
- Ballintoy
- Dunluce Castle
- Antrim Castle
- Armoy
- The Giant’s Causeway, roughly an hour further north
If you can only manage one thing, walk straight through to the walled garden and give it a proper hour – it’s the piece of Glenarm that a local would actually send you to.