The hillfort's inner rampart is roughly 800 feet in diameter, enclosing an area that served as a fortified settlement for over 500 years.
Excavations in the early 20th century uncovered evidence of a Romano-British village established within the fort's defenses after the Roman conquest.
The name 'Barbury' likely derives from the Old English 'burh-beorg', meaning 'fort hill'.
The site acts as a critical wildlife corridor, supporting populations of chalkhill blue butterflies and scarce plants like the horseshoe vetch.
During the 1990s, the park was frequently a focal point for crop circle sightings, which drew significant international attention to the area.
Barbury Castle Country Park features a well-preserved Iron Age hillfort set within the Marlborough Downs. The site consists of a 12-acre enclosure protected by two sets of massive ramparts and deep ditches. Dating back to approximately 600 BC, the site was occupied by the Durotriges tribe before being reused during the Roman occupation. The park encompasses 270 acres of chalk downland, managed by Swindon Borough Council. It is a designated Site of Special Scientific Interest and a Scheduled Ancient Monument. The terrain offers panoramic views across the Vale of White Horse and the surrounding Wiltshire landscape. The Ridgeway National Trail passes directly through the site, making it a key junction for long-distance hikers. It serves as a natural habitat for rare chalk grassland flora and diverse butterfly species.
The northern ramparts, looking out toward the Vale of White Horse during the golden hour.
Carry binoculars to spot paragliders who frequently use the steep slopes of the hillfort.
Walk the perimeter of the ramparts first to understand the scale of the earthworks before exploring the interior.
Bring windproof clothing as the hilltop is exposed and experiences strong gusts year-round.
Do not attempt to drive vehicles off the designated parking areas; avoid visiting during high-wind weather alerts as the hilltop offers no shelter.
Keep dogs on leads to protect ground-nesting birds and livestock; do not climb on the steep earthwork banks to prevent erosion.
