League One clubs have voted to mirror the Championship and play a reduced 27-game season starting on October 17.
SPFL chiefs confirmed the third tier - which is set to include Partick Thistle and Cove Rangers - will come out of the coronavirus lockdown two-and-a-half months after the Premiership and clubs will play each other only three times.
Discussions over a start date for League Two are ongoing but work on a fixture list for the second and third tiers will now begin.
It remains to be seen whether supporters will be allowed back into stadiums by mid-October with Nicola Sturgeon today claiming a decision has still to be taken on when fans will be allowed back through the gates.
SPFL chief Neil Doncaster said: “Following a period of consultation with all League One clubs, they have today formally voted to approve the altered programme for the 2020/21 season.
"This is positive news and gives clubs a greater level of clarity and, crucially, a target date to aim for.
“Of course, the safety of players and staff at all of the clubs involved will remain paramount, with these dates still contingent on the continued reduction in the virus’s spread.
“Now that we know what next season will look like for League One, work will begin on compiling the competition’s fixture list.”