The start of the 2020-21 season has been delayed due to the Covid-19 pandemic, but many sports already have defined calendars. Men's roller hockey was among the earliest, with CH Mataró, promoted to the OK Liga, debuting on September 26 at the Jaume Parera Pavilion hosting CP Voltregà. Regarding handball, the men's Joventut Handbol Mataró (1ª Estatal) will start on October 3 visiting Handbol Palautordera, while the women's team (División Plata Estatal) will start on September 26 at the Associació Lleidatana court.

Men's basketball in the State EBA League, featuring Mataró Parc Maresme and UE Mataró Germans Homs, will begin the weekend of October 3 and 4. The local derby at the Palau Josep Mora is scheduled for October 4. In the women's category, the two Mataró teams will also compete in the Liga Femenina 2, which kicks off the same weekend. Advisoria Boet Mataró already debuted with a victory in the preliminary phase of the Catalan League. Meanwhile, Iluro HC field hockey (1ª Catalana) is one of the first to compete, debuting on September 19 in Terrassa.

Men's football in 1ª Catalana, with CE Mataró, and 2ª Catalana (with UD Cirera and UD Molinos) have set their start date for October 4. CE Mataró will travel to Llefià's field. In women's football, CE Mataró and the promoted UD Molinos (both in 1ª Catalana) also start on October 4. As for futsal, Futsal Mataró (2ª División Estatal B) awaits its schedule for late October, while Spall CFS Ciutat de Mataró (3ª División Estatal) starts on October 3.

Water polo will be the last to start the state leagues. The women's CN Mataró, current champion of the División de Honor, will debut on October 17 visiting CN Rubí. Before that, the Catalan Cup will begin on September 16. In the men's category, Quadis CN Mataró will also start the División de Honor on October 17 with a trip to Pamplona against WP Navarra, having previously played the Catalan Cup starting September 23.