Campaigners claim a vital “countryside lung” between Leeds and Bradford could be destroyed if plans to build hundreds of new homes are approved.
Members of Save Tong and Fulneck Valley are writing to councillors in Bradford to urge them to throw out plans to build 1,800 homes at Westgate Hill and Tong Valley.
They fear that the countryside between Leeds and Bradford would be reduced if plans are given the green light.
And they fear that the plans would impact on the heritage of historic sites such as Fulneck, in Pudsey.
Canon Gordon Dey, who is leading the campaign, said: “Our Association was formed over four years ago, with a membership of over 300 local people and users of the Valley, when it was apparent that there was a real threat to land in the Tong Valley.
“In these past years we have consistently opposed plans that would destroy this important area of countryside, so strategically important for Bradford, Leeds.
“Our association recognises the need for a substantial house building programme in Bradford, allied to the development of employment opportunities.”
He added: “It would affect the heritage communities of Tong and Fulneck which are unique.
“Over the coming years countryside close to the big cities is becoming more and more important.
“It is even more important to protect this.”
Councillors from Bradford Council are set to decide on their core strategy of the local plan next week where they could be given the green light.
Members of the campaign group are expected to protest at the start of the meeting on Tuesday at Bradford Civic Hall from 3.15pm.