Port Phillip Council has voted to extend a 24-hour alcohol ban on the St Kilda foreshore following the trashing of South Beach Reserve on Christmas Day.

The ban, stretching from Marina Reserve to West Beach, was due to expire on January 5 but will now be extended until February 15. The extension is a trial for a permanent ban.

Mayor Bernadene Voss and councillors will decide on February 7 whether or not to extend the ban until the end of summer.