Random border checks will be imposed to stop French holidaymakers going to ski in neighbouring Switzerland, prime minister Jean Castex has said, reports the BBC.
France, in common with Germany and Italy, is shutting its ski lifts over Christmas to stop the spread of Covid-19, but Swiss slopes are already open.
The ski season at Christmas and the New Year is a vital part of the economy for many European countries
Mr Castex said it was his duty to protect fellow citizens.
"The conclusion you need to make is that 'I'm not going to Switzerland'," he told BFMTV on Wednesday, adding that anyone who did go would face quarantine on their return.
Several EU leaders have tried to co-ordinate plans ahead of Christmas.
However, Switzerland is not part of the European Union, and Austria and Spain are keen not to shut their slopes entirely.