Castle Leslie Estate
Monaghan
County Monaghan has one independently certified eco property: Castle Leslie Estate in Glaslough, which holds Green Hospitality Gold certification. One of the last great private estates in Ireland, covering 1,000 acres of unspoilt County Monaghan countryside, it is the certified eco accommodation option for a county that mainstream eco tourism has largely overlooked.
Castle Leslie Estate holds Green Hospitality Gold, independently audited against Ireland’s hospitality sector sustainability standard. The estate is a Victorian castle that has remained in the same family for over 300 years, now certified at the level that independently confirms its environmental management across energy, water, waste, biodiversity, and community engagement.
Gold certification under the Green Hospitality Programme requires demonstrated performance across all assessed criteria, not merely the implementation of a management system. For a 1,000-acre estate of this age and complexity to achieve Gold, the operation must be genuinely committed to sustainable management at scale.
Castle Leslie Estate covers 1,000 acres of woodland, parkland, and lakes in County Monaghan, surrounding a Victorian castle built in the 1870s and overlooking Glaslough Lake. The landscape is genuinely unspoilt: woodland walks, trout fishing in the lake, and the working estate provide an environment that is rare in modern Ireland.
Accommodation options span three distinct types. The Castle itself offers Victorian rooms and suites furnished with original antiques and period details within the main building. The Lodge is a more contemporary hotel building on the estate with a spa and leisure facilities. Self-catering cottages are dotted across the estate grounds, suited to families and small groups.
Castle Leslie’s equestrian centre is one of Ireland’s most celebrated, offering riding lessons and treks through the estate and surrounding countryside. The combination of equestrian access, castle atmosphere, fishing, woodland walking, and spa in a single certified eco estate is not replicated anywhere else in Ireland.
Monaghan is a border county in the drumlin belt of south Ulster, a landscape of small rounded hills, lakes, and intimate farmland that is characteristic of the glaciated Midlands. The county is largely unknown to leisure tourism, which makes it all the more rewarding for travellers seeking genuine quiet.
Castle Leslie Estate is the argument for adding Monaghan to an eco itinerary. A 1,000-acre certified estate with accommodation ranging from castle suites to self-catering cottages, in a landscape without visitor pressure, within 2 hours of Dublin and 1.5 hours of Belfast, is an unusual proposition.
The estate’s position near the border means it connects naturally to certified eco options in both the Republic and Northern Ireland. Cavan’s Farnham Estate is 50km west. The certified hotels of Derry are 80km north. The certified Belfast cluster is 100km northeast.
Monaghan sits in the Ulster corridor between Armagh, Tyrone, Fermanagh, Cavan, and Louth. Of these neighbouring counties, only Cavan has a certified eco property (Farnham Estate, Green Hospitality Eco-Label). Castle Leslie Estate in Monaghan is the only certified option between Cavan and the Northern Ireland certified cluster.
For travellers planning a certified eco itinerary between Dublin and Northern Ireland, Castle Leslie is the natural midpoint: 130km from Dublin, 100km from Belfast, and the most distinctive certified property in the Ulster border region.
One certified eco property: Castle Leslie Estate, Green Hospitality Gold certified, in Glaslough.
Certified Stays