Loftus bank - the site of major engineering works since a landslip more than a year ago - is to close for nine weeks.
The final stage of work is due to start next month and will involve the building of a retaining wall at the top of the bank.
Redcar and Cleveland Council engineers hope the work, which will be carried out seven days a week from 6am to 10pm, will be completed by the end of September.
Problems started at the bank in March, last year, following extensive flooding. Repairs started in December and the bank has remained open to small vehicles for much of the time.
The existing road has to be removed to a depth of seven metres and the retaining wall, 60 metres long and seven metres high, will be built then the road replaced.
Before the road is closed, the council intends to introduce traffic calming measures on North Road and Hummersea Lane in Loftus and in Skinningrove.
It has sent leaflets on the latest developments to more than 1,000 homes and businesses in the Loftus, Easington, Liverton Mines, Carlin How and Skinningrove areas.
The council also intends to hold meetings with Loftus Town Council, the town's business association and the local road safety committee.
In a letter to residents, Coun Sylvia Szintai, Lead Councillor for Environment and Infrastructure, said: "The final part of the work is regrettably going to be the most disruptive. We think the road closure will start towards the end of July for completion at the end of September.
"It helps that for much of this period the schools will be on holiday and traffic at its lightest. Hopefully, the weather will also be kind."
Cleveland Police said the work would make the A171 Guisborough to Whitby moors road busier.
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