The moves come after the Government amended regulations to confirm that people in England could visit gardens and land maintained for public use.
The phased reopening will begin with five gardens and park properties in the Midlands opening from June 3.
The charity says at some sites they may have “set up new routes”, such as a one-way system and say some facilities aren’t yet open, such as cafés and food outlets, and some toilets.
The Trust said they will be operating at a reduced capacity to ensure the safety of visitors and staff in line with government advice.
More sites will open over the coming weeks for properties where social distancing can be observed, and with only around a third of the normal number of visitors permitted.
Sites reopening in the Midlands: