The tree likely prevented serious injury on the hilly road - beyond it lay a 10 metre bank drop.
A man who claimed to be the driver of the car told Hawke's Bay Today's Facebook page he was going 40km/h down the hill in wet conditions when he "just lost traction".
"The car kept sliding, couldn't control anything."
He described the experience as "scary as".
The car remained at the scene in a precarious looking position on Friday.