Open all year during reasonable daylight hours; no admission charge. Cadw asks visitors to come in daylight for safety and may close monuments at short notice in extreme weather.
Terrain level 2, easy: an exposed field that may be slippery or muddy underfoot, with guardrails to respect and no climbing on the stones; sheep graze the fields above. No toilets or facilities; an information sign stands before the stones. Drones are not permitted.
Dogs: Dogs on short leads are welcome at the tombs, an open field site at ground level.
Photo: The eastern chamber of the Dyffryn Ardudwy tombs, its capstone resting on tall portal stones among the cairn stones, with the smaller western chamber behind at the left and the coast beyond the field wall. Trevor Harris, CC BY-SA 2.0. Source: https://commons.wikimedia.org/wiki/File:Neolithic_Burial_Chambers_-_geograph.org.uk_-_6270190.jpg. Licence: https://creativecommons.org/licenses/by-sa/2.0. Resized and cropped for display; derivatives retain the source licence.