East Hampshire District Council has ruled out any building on Hogmoor Inclosure, Eveley Wood, the Deadwater Valley and Hampshire County Council owned farmland around Standford, after a survey showed it was possible to fit more houses on brownfield land.
The four areas will now be safeguarded as a key feature in Whitehill and Bordon's eco-town bid.
EHDC's chief executive Will Godfrey said: "I am keen to reassure residents that the town's green spaces will be protected as a vital part of the eco-town.
"It is a requirement that to gain eco-town status the ecology must be improved.
"The council is committed to Whitehill and Bordon's ecological management and is determined to make it a showpiece for the south east."
The council is proposing to build 5,500 homes if it wins eco-town bid status from the Government in October.
EHDC leader Ferris Cowper said about 100 hectares of brownfield land was being released by the MoD in 2012, with the Government allowing 75 dwellings per hectare and higher densities of 95 or more in town centres.
He said: "If we don't go for eco-town status or pursue the Green Town Vision, then an open market sale of the land will bring at least 7,500 dwellings and maybe as many as 9,500.
"EHDC's strategy is the only way to get the right balance between housing, community facilities and ecology."
Cllr Cowper also hit back at claims made by environmental campaigner Marilyn Metcalfe in last week's Post, who said EHDC's eco-town bid would fall foul of planning laws if it tried to build near the habitats of ground nesting birds in parts of the town.
Cllr Cowper said: "Marilyn Metcalfe has got it seriously and in my view, irresponsibly, wrong.
"There are no plans for EHDC to build on the Hogmoor Inclosure or at Standford.
"Her assertion that we do have such plans and her accusations of our lack of consideration, are simply inaccurate scaremongering."
Cllr Cowper said the Hogmoor Inclosure was not on the schedule of land to be released because no decision had been made about the future of the School of Electrical and Mechanical Engineering driver training.
"I think the tank drivers might get a bit upset if they found houses in the way!" he added.
A public meeting on the eco-town bid is being held at the Forest Community Centre on Thursday, July 24 from 7-8.30pm, and Cllr Cowper will be there to answer any questions residents may have about it.
He said: "If anyone thinks there is a better solution for the town's needs than eco-town status they should to me, in person, directly at EHDC.
"I promise that if someone comes up with a better idea I will personally propose it to the council's cabinet. "But remember, whatever we do has to improve housing, improve employment, improve the environment and improve the facilities for the people who live here.
"Not just one of those, but all of them.
"That is what our eco-town bid will do - it is put up or shut up time."
To write to Cllr Cowper e-mail him at ferris.cowper@easthants.gov.uk