Wales will go into a “short, sharp” national lockdown from Friday until Monday, 9 November.
People will be told to stay at home, while pubs, restaurants, hotels and non-essential shops will shut.
Primary schools will reopen after the half-term break, but only Years 7 and 8 in secondary schools will return at that time under new “firebreak” rules.
Gatherings indoors and outdoors with people not in your household will also be banned.
First Minister Mark Drakeford said the “time-limited ‘firebreak'” will be “a short, sharp, shock to turn back the clock, slow down the virus and buy us more time”.