City Plan 3, the latest planning blueprint for Glasgow, shows the North Kelvin Meadow and Children's Wood in the West End is still zoned for housing.
Hundreds voted to rezone the area of meadow and woodland into green space, a suggestion which campaigners feel has been disregarded in the council's new proposals.
Emily Cutts, of the Children's Wood, said: "We are still on the map as a potential building site for the new City Plan 3.
"It is clear that despite the explicit submission of hundreds of local people's votes to rezone the Meadow and Wood as a green space, the council still wants to hold onto the land for building.
"This is deeply disappointing and we are now looking into why our votes seem to have been ignored."
Situated between Clouston Street, Sanda Street and Kelbourne Street, the area was formerly playing fields and is used by 14 schools and countless numbers of families and community groups stretching from the West End to Maryhill and Lambhill.
Thousands regularly visit the secret garden which provides a rare opportunity for locals to enjoy peaceful outdoor space in the middle of the city.
Campaigners insist the latest suggestions will not deter them from objecting once again to the proposals.
Emily added: "It is fulfilling its purpose as a key space for local recreation, as it did for decades before.
"It is extraordinary that the plans still show it as brown, directly contradicting council policies on land management.
"This setback will not dampen our spirits in our battle to save the land, and we want to know why the community's voice has not been heard on this issue."
They now have less than two months to object to the latest plans, as the deadline for representations closes on Friday, June 27.
A council spokesman said: "The area of the former playing pitches at Clouston Street is classified as a proposed development site in the proposed City Development Plan, as it was in the previous plan.
"Any person or group who wish to query a classification in the proposed City Development Plan can do so in the representation period, as long they follow the proper process."