Council chiefs have decided to retain the primary schools at Pinwherry and Straiton, and build a new school at Colmonell.
The decision, taken at a meeting of South Ayrshire Council's Leadership Panel on Tuesday, has been warmly welcomed.
Colmonell Primary School will be demolished and a new £1.5million school built.
And in Pinwherry and Straiton, the schools will be brought up to standard through a refurbishment programme.
Girvan and South Carrick Councillor John McDowall said: "I am delighted that the Leadership Panel has approved the building of a new school on the current site of the primary school at Colmonell.
"It is also good news for parents and pupils that the panel voted to upgrade Pinwherry Primary School, and this will be included in the Council's Asset Management Plan."
One delighted mother spoke after the announcement and expressed her delight that the situation had been resolved.
She said: "It's a relief to know that all the hard work that parents and the teachers put in have paid off and all three schools are safe.
"We can look forward to children in our village attending a school that is not only safe, but modern and will benefit their education."
Carrick MSP Cathy Jamieson added: "Parents will be delighted that the council has shown commonsense and decided to retain these vital rural primary schools. Parents and pupils have made a strong case to keep their local primary schools.
"Now that the future of primary schools in Colmonell, Straiton and Pinwherry have been secured, I want to see the council investing in these schools to ensure that our young people will benefit from a modern school building fit for the 21st century."
Parents in Pinwherry campaigned hard for their school to stay in the village.
Straiton primary will undergo major refurbishment work after a recent HMI inspection report highlighted a number of problems to do with the accommodation.
It said: "Toilet facilities were inadequate and were shared by pupils and teachers. Space in the office and staffroom was limited and accessed through the P1 to P3 classroom.
"There was a lack of suitable space to accommodate meetings, visitors and visiting staff working with pupils.
"The well-used annexe was shared with the nursery, and used as the school dining-room. Time for staff to prepare the dining area and to clear up following school lunches was limited.
"The concrete playground had recently been resurfaced but was on a steep and potentially hazardous slope.
"Access to both buildings for disabled users was limited, although further development was planned."
The refurbishment of the school will now focus on these issues and bring the building up to a modern and safe standard.