The competition began in August with the first games of the regional stages and ended in November with the final of the national tournament.
As part of the new competition format started in 2019, the four semifinalists qualified to the Copa del Rey first round.
Eight teams joined the tournament: Barbastro (5), Belchite 97 (5), Binéfar (5), Borja (5), Calamocha (5), Cuarte (5), Ejea (4) and Utebo (5).
Formentera (4), Peña Deportiva (4), Platges de Calvià (5), Poblense (5) and Sant Jordi (5) joined the tournament.
The winner of Copa RFFM qualified to the semifinals with Las Rozas (5), Móstoles URJC (4) and Navalcarnero (4).
8 teams joined Copa RFFM, starting August 15th: Alcorcón B (5), Carabanchel (5), Fuenlabrada B (5), Moratalaz (5), Parla (5), Pozuelo (5), Rayo Vallecano B (5) and Torrejón (5).
Melilla was directly selected by Real Federación Melillense de Fútbol due to sporting merits.
[24] Avilés (4) Langreo (4) Arenas de Getxo (4) Leioa (5) Gimnástica Torrelavega (5) Racing Santander (3) Alondras (5) Alfaro (5) Tenisca (5)† Guijuelo (5) Numancia (4) Toledo (4) Mérida (4) Moralo (5) Villanovense (4) Navalcarnero (4) Ebro (4) Ejea (4) Peña Deportiva (4) Costa Brava (3) Lleida Esportiu (4) Izarra (4) Atzeneta (5) Hércules (4) Córdoba (4) Juventud Torremolinos (5) Linense (3) Xerez (5) Betis de Hadú (6) Melilla (4) Murcia (4) Yeclano (5) Winners qualified to the 2021–22 Copa del Rey first round.