CCBC tells us that it will be between 9:30am and 3:30pm. One section of the closure is starting from the junction with the mountain road (Tram Road) above Universal Villas. The other section is starting from just below the Four Terraces. The closure ends just above the entrance to Nant-y-Parc School. During the closure traffic from the Four Terraces will have to use the mountain road to Nelson. In addition there will be a diversion from Nant-y-Parc School around Stanley Street. At the time of writing this the Council have not been able to confirm the arrangements for buses during the time of the road closure.
If you intend to visit the Garden on this coming Thursday June 27th between 9:30am and 3:30pm you can leave your vehicle on the roadside leading to the Garden and walk the remaining 50 yards into the Garden.
Sorry for the inconvenience.