Roadworks will get underway at Sutton Bank next month.
The road will close for one week from Monday, September 5 to allow North Yorkshire County Council to carry out an annual inspection and maintenance of the rock face.
The bank carries the A170 up an extreme gradient and regular work is needed to ensure the road remains in good condition.
County Councillor Don Mackenzie, executive member for highways at the council, said: “Sutton Bank is a vital part of the county’s highways network, and ensuring it remains in good order is essential.
“Traffic will be diverted along the caravan route through Coxwold and Ampleforth. We ask drivers to drive considerately, especially through the villages, having regard for residents and obeying speed limits.”
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