Free entry for everyone; no membership card is needed.
The Trust's page does not say how parking is charged.
Cadw says parking is available on the main road adjacent to the monument for a small number of vehicles, and visitors park on the road alongside the fence; nothing is published about charges, so the status is recorded as unknown. Gwynedd Council's town car parks (Ffordd y Felin, Glan Mor Uchaf) are about 700 to 800 m away. On foot it is a 10 to 15 minute moderately steep walk up from the town centre, and the Wales Coast Path itinerary reaches it within half a mile of the castle.
Driving pin: Cadw's own arrival point on Constantine Road at the fort's roadside fence, 95 m from its marker (which falls on a house behind the fort) and 27 m from the fort's Google listing. By road: 0.6 miles south-east of Caernarfon on the A4085. National Cycle Network route 8 passes 1 km away.
Segontium Roman Fort, Caer Rufeinig Segontium, stands on the hill above Caernarfon at the edge of the Roman Empire, founded by Agricola in AD 77 after he had brutally suppressed the Ordovices and captured Anglesey. Built for a regiment of 1,000 auxiliary infantry and linked by road to the legionary bases at Chester and Caerleon, it was the military and administrative centre of north-west Wales, rebuilt in stone from about AD 140 and later used against Irish pirates. Coins show the garrison stayed until about AD 394, longer than at any other fort in Wales, and the place passed into legend as Caer aber Seint in the Mabinogion. Its stone was reused in Edward I's town walls. The excavated foundations show barrack blocks, the headquarters with its underground strongroom, the commander's house, two gateways and a stretch of wall. Visitors call it a little gem for ruin lovers, a steep ten-minute walk up from town; the museum building is closed and the bath house across the road is fenced off.
Segontium Roman Fort is open on selected dates as part of our guided tours programme from May to August each year. These tours provide a unique opportunity to explore the site with expert insights into its history and significance. Find out more and book tickets
Open any reasonable time in daylight.
Free entry
Open all year, last admission 30 minutes before closing; closed 24, 25 and 26 December and 1 January. Cadw prints no daily hours; Visit Wales and Google give 10am to 4pm, and Cadw asks visitors to attend only during the set opening hours. No admission charge. Cadw also runs booked guided tours here on selected dates from May to August at £12 (Cadw members £10), which are an extra, not the admission; the 2026 season has ended. Cadw may close monuments at short notice in extreme weather.
The museum building on the site is closed: its collection was removed to National Museum Wales stores in 2009 to 2011 and it now serves only as an occasional visitor centre, so expect a single information board. Terrain level 2, easy: grass and gravel paths between low walls, with ditches, historic steps and slippery or uneven surfaces; no toilets. The bath house in the field across the road is fenced off and not open. The site can be hired for events and filming. Drones are not permitted.
Dogs: Cadw: 'Dogs welcome. Dogs on short leads welcome to access ground floor levels of the site.' Listed under North West Wales on Cadw's dog-friendly page: short lead at all times, ground floors only. An open-air site, so the rule is the short lead.
Photo: The low stone foundations of the commander's house at Segontium Roman Fort, with Scots pines and the rooftops of Caernarfon behind. Otter, CC BY-SA 4.0. Source: https://commons.wikimedia.org/wiki/File:Segontium_Roman_Fort_20171018_praetorium.jpg. Licence: https://creativecommons.org/licenses/by-sa/4.0. Resized and cropped for display; derivatives retain the source licence.
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Dog access not confirmed
Mainly flat linear walk of 2 to 11 miles (3 to 18 km) from Menai Bridge along the Menai Strait to Caernarfon, then across the main road and up residential streets to reach Segontium within half a mile of the castle; parking and toilets in both towns. Free.
