The California Department of Transportation announced the Wednesday reopening but warned there may be one-way traffic at times because of ongoing construction.
It says it will hold a ribbon-cutting ceremony Friday at the nearby Ragged Point Inn.
RELATED: Big Sur landslide will take months to repair
The department posted a photogram on Twitter showing the newly built, two-lane road and saying the road is "open for business."
A quarter-mile of Highway 1 at a spot called Mud Creek was buried in May 2017 when more than 1 million tons of rock and earth slipped down a slope saturated by winter storms.
RELATED: Another massive landslide cuts off Hwy 1 access to Big Sur
The debris slid well out into the ocean, creating 15 acres (6 hectares) of new coastline about 9 miles (14.5 kilometers).
Click here for more stories about recent landslides.