5The passage into Cairn T is open, with OPW guides in attendance, daily during the months of June, July, and August from 10:.00 a.m. until 6:00 p.m.. Last admission to Cairn T is 45 minutes before closing. More information here. At other times a key may be borrowed for a €50 deposit and/or a driving license/passport from the tea house at nearby Loughcrew Gardens.