Pupils returning to St Mary's Catholic Primary School for the start of the new term made an unwelcome discovery last week.
Two trees at the back of the school in Cookham Road, Maidenhead had been cut down by vandals who had sawed their way through the trunks.
School secretary, Ros Grainger, said she did not know who was behind the vandalism or why the trees had been targeted.
"They were disappointed and upset really," she added on the children's reaction to the damage.
"It is the whole thing that someone has been on site and done this deliberate act."
Plans are now in place to take the trunks of the trees out of the ground, which is situated in an untouched 'wildlife' part of the school's grounds.
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