Football League clubs have voted through proposals to shut the summer transfer window for permanent transfers on Thursday, 9 August at 17:00 BST.
It brings League clubs in line with the Premier League, who voted in favour of closing the window before their season starts last September.
The 2018-19 Football League season is scheduled to start on Saturday, 4 August and clubs outside the top flight will still be able to sign players on loan until 31 August.
They will also be able transfer players out to clubs in leagues where the window remains open, with European leagues still able to buy and sell until 31 August.
EFL chief executive Shaun Harvey told the BBC: “After discussing the options throughout the course of the last few months, I’m pleased that the matter has been determined by clubs ahead of the start of next season.
“This new approach will give clubs and managers the stability they crave earlier in the season whilst also providing the flexibility to add to their squads after the traditional deadline until the end of month if required.”