Cinder Ash Pre-School has asked for parish council support to put up a new fence outside its building in Long Sutton.
Staff at the pre-school in Park Road fear that older children could climb over the current four foot-high fence and get into the nearby park.
Manager Lucy Cooper said: “At the moment, the fence isn’t very attractive and it’s also very low which means that our children can see what’s going on outside as we’re in the middle of a public park.
“The fence is something we’ve wanted to change for a long time, especially for the security of the children.”
Parish councillors have asked for more information about the pre-school’s plans.