The tournament started on 31 January and ended on 26 December 2020, with Atlético Huila winning their third title in the competition after defeating Cortuluá in the finals.
The season runners-up would then play the best team in the aggregate table (other than the champions) in another double-legged series for the second promotion berth.
On 13 March 2020, after a meeting with its member clubs, DIMAYOR announced the temporary suspension of the tournament, along with the Primera A and Copa Colombia ones, due to the COVID-19 pandemic.
According to said timetable, the league was scheduled to resume on 27 August, pending the fulfillment of the previous stages as well as final approval by the Colombian government.
[10] Upon the conclusion of the first fifteen matchdays of the first stage, teams played two additional games in double-legged ties, with the teams ranked from first to eighth place after the fifteenth round being seeded and paired against a rival ranked in the bottom half of the table at that point, which were decided by a draw held on 2 November 2020.