Burghley House leads the way again as with the Diamond Jubilee.
The 70-acre forest will be planted in the grounds of the Elizabethan mansion near Stamford.
Dr Darren Moorcroft, chief executive of the Woodland Trust, said he was “thrilled” Burghley had been chosen to “spearhead the celebration”.
The charity hopes to establish up to 70 Platinum Jubilee woods as part of its Queen’s Green Canopy initiative.