The national award for public and community parks and greenspaces, the Green Flag award scheme recognises and rewards the best green spaces across the country.
Council Muir had previously asked that Green Flag status be explored for a number of North Down Parks – including Ward Park, but with Unionists voting against the idea, the initiative was abandoned.
“I’m delighted that an issue I have worked hard to bring to the attention of others has finally been recognised by the new Ards and North Down Council,” Councillor Andrew Muir said.
“Castle Park deserves this award, with many working together to ensure the park remains an area of natural beauty.
“We must do everything we can to protect our environment and I hope that when this comes before the Council again, no-one will stand in the way letting this process proceed.
“I hope we will see Castle Park join Kiltonga Nature Reserve in gaining Green Flag status. Now is the time to invest in our environment, creating a green economy that will benefit the lives of everyone in Northern Ireland.”