The 100ft-long tall ship Irene of Bridgwater, with 10 people on board, became stuck in Lamlash Bay on its way to port at Greenock.
Clyde Coastguard said the ship was expected to refloat at high tide in the early hours of this morning. There was no danger to anyone on board.
Greenock is hosting the second stage of the race, following Waterford, Ireland. BBC News has more HERE.