Free entry for everyone; no membership card is needed.
Arrive on foot, by bike or by public transport.
Cadw lists no designated parking. Visitors park on the road in Grosmont village near the church (a reviewer's tip, not an official arrangement) and take the public footpath from the B4347 through a gate, a short five-minute walk on a grassed track that is uneven and slippery or muddy in poor weather, to the timber footbridge over the castle ditch. Please do not park on verges, in field entrances or passing places.
Driving pin: where the footpath to the castle leaves the B4347 village street, 113 m from Cadw's marker on the castle. By road: Grosmont is on the B4347, 10 miles north-west of Monmouth and 9 miles north-east of Abergavenny. National Cycle Network route 46 passes 0.3 km away.
Grosmont Castle, Castell y Grysmwnt, is one of the Three Castles of Gwent, built with Skenfrith and White Castle by the Normans to control a key stretch of border country. The first earth-and-timber stronghold on its gros mont, French for big hill, was replaced in stone: a 13th-century rebuilding gave it the gatehouse and round towers of red sandstone inside a wide moat, and a century later it was remodelled with apartments fit for a noble household. In 1405 Owain Glyndwr's son besieged the castle and was beaten back by an army under Henry of Monmouth, the future Henry V; it was disused by 1538. Reviewers find it a short but rewarding visit, with a stepped climb to a viewing area; there is no car park, so visitors park in the village and walk five minutes over the footbridge. Dogs on short leads are welcome at ground level, and the Three Castles Walk links it with Skenfrith and White Castle.
Grosmont Castle is currently closed due to poor weather conditions . We are monitoring the situation and will update you when it is safe for you to visit. Thank you. Grosmont Castle – Footbridge Refurbishment Works Cadw is undertaking essential refurbishment of the timber footbridge spanning the historic castle ditch. See the official page for the full notice.
Free entry
Open 10am to 4pm all year, last admission 30 minutes before closing; closed 24, 25 and 26 December and 1 January. Visitor notice (17 October 2026): Cadw's carpenters and masons refurbished the timber footbridge over the castle ditch between February and September 2026, and the castle is open again while the final works to the bridge are completed. Cadw may close monuments at short notice in extreme weather.
Terrain level 2, easy: a five-minute walk on an uneven grassed track to the footbridge, then uneven ground within the castle; the upper levels are reached by designated historic steps with handrails to viewing areas, slippery when wet. Keep behind the guardrails and mind hidden drops. No toilets, cafe, shop or picnic tables. Drones are not permitted.
Dogs: Dogs on short leads are welcome on the ground level of the castle; the steps to the upper viewing areas are for assistance dogs only. The ward inside the moat is at ground level and open to dogs on a short lead; the site is free. The Three Castles Walk follows rights of way across farmland; Monmouthshire Countryside Service asks that dogs follow the line of the path and are kept on a lead through livestock enclosures and near farms.
Photo: Grosmont Castle's ruined tower and hall block above the grassy ditch, with the timber footbridge at the left, under a blue sky. Lucy Devan Sheers, CC BY-SA 4.0. Source: https://commons.wikimedia.org/wiki/File:Grosmont-castle-june-2017.jpg. Licence: https://creativecommons.org/licenses/by-sa/4.0. Resized and cropped for display; derivatives retain the source licence.
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Dogs, with restrictions
Circular route of about 19 miles (30 km), waymarked and mostly on public rights of way across farmland with many stiles, opened 1991; White Castle to Grosmont about 6.5 miles (10.5 km) with the optional climb of Graig Syfyrddin, Grosmont to Skenfrith about 5.5 miles (9 km); limited parking for the walk only at Skenfrith. Free.
