Rossmore Forest Park
A former Monaghan estate whose rhododendrons and giant redwoods outlived the castle that was demolished in 1975.
Updated 19 October 2026
Rossmore was the demesne of the Westenra family, Barons Rossmore, whose Victorian castle stood on the high ground until dry rot and the cost of maintenance led to its demolition in 1975; the terraces, steps and foundations are still there, marked out in stone with nothing on them. The planting survived better than the building. The park holds mature specimen trees including giant redwoods, and an extensive rhododendron collection that flowers through May and June and is the main reason people come at that time - though rhododendron ponticum has also spread invasively through parts of the woodland and is managed as a problem elsewhere in the park. There are waymarked trails of several lengths, two small lakes, a family mausoleum, and a large yew avenue. Trails are surfaced and mostly easy, with some climbing to the castle site.
History
The park was the site of Rossmore Castle, home of the Rossmore family, the local landlords in the 18th and 19th centuries, whose house was pulled down in the 1970s; the estate is now a national forest park about 5 km outside Monaghan town, run by Coillte (Wikipedia, Rossmore Forest Park).
Highlights
- The castle terraces - foundations and steps where the house stood until 1975.
- The rhododendrons - flowering through May and June across the woodland.
- The redwoods - mature giant specimens from the estate planting.
- The mausoleum and yew avenue - what remains of the estate's formal features.
When to go
May and June for the rhododendrons at their peak. April to October for the trails generally. Winter leaves the park muddy but quiet.
Things to know
The castle is entirely gone - only foundations remain. Rhododendron is both the attraction and an invasive problem here, so some areas are being cleared. Car park charges and trails are muddy after rain.
Nearby
Monaghan town and its county museum are north; Clones is west.
Key facts
Source: Wikidata, item Q7369900, read on 18 October 2026.
What to pack for Rossmore Forest Park
Chosen from what this place is for. Tap a kit for the full checklist.
- Broken-in walking shoes or boots - Grip and ankle support matter more than looks; never hike in brand-new boots. Find on Amazon
- Layers + a waterproof shell - Mountain weather turns fast; a packable rain jacket saves the day. Find on Amazon
- Daypack with rain cover - 20-30 litres holds water, snacks, layers and a first-aid kit. Find on Amazon
- Offline maps + a power bank - Download the trail before you lose signal; carry backup charge. Find on Amazon
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