The season started as normal, but due to the corona-virus and the measures against the illness, suddenly things changed.
The postponement came after the Swiss Federal Council banned all major events until 15 March due to the COVID-19 outbreak.
[3] Due to the corona-virus measures, the start of the second half of the Promotion League season, planned for the end of February 2020, was postponed.
[1] In the previous season Stade Lausanne Ouchy became division champions and had been promoted.
Liga Classic and Rapperswil-Jona joined the division, after suffering relegation from the 2018–19 Swiss Challenge League.